diff --git a/src/assets/icons/equalizer.svg b/src/assets/icons/equalizer.svg
new file mode 100644
index 0000000..e7e27da
--- /dev/null
+++ b/src/assets/icons/equalizer.svg
@@ -0,0 +1,8 @@
+<svg xmlns="http://www.w3.org/2000/svg" width="24" height="24" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round">
+  <line x1="6" y1="4" x2="6" y2="20" />
+  <line x1="12" y1="8" x2="12" y2="20" />
+  <line x1="18" y1="6" x2="18" y2="20" />
+  <circle cx="6" cy="4" r="1.5" fill="currentColor" />
+  <circle cx="12" cy="8" r="1.5" fill="currentColor" />
+  <circle cx="18" cy="6" r="1.5" fill="currentColor" />
+</svg>
diff --git a/src/components/BottomBar/Equalizer.vue b/src/components/BottomBar/Equalizer.vue
new file mode 100644
index 0000000..43919e0
--- /dev/null
+++ b/src/components/BottomBar/Equalizer.vue
@@ -0,0 +1,547 @@
+<template>
+    <button 
+        v-wave
+        class="equalizer" 
+        :class="{ 'eq-disabled': !eq.enabled }"
+        @mouseenter="handleMouseEnter" 
+        @mouseleave="handleMouseLeave"
+    >
+        <div 
+            class="icon"
+            @click.stop="handleClick"
+            @wheel="handleIconWheel"
+        >
+            <Motion
+                :initial="{
+                    opacity: 0,
+                }"
+                :animate="{
+                    opacity: 1,
+                    transition: {
+                        delay: 0.25,
+                        duration: 0.5,
+                    },
+                }"
+            >
+                <EqualizerSvg :key="eq.enabled" />
+            </Motion>
+        </div>
+        <div class="eq-popup" :class="{ pinned: isPinned }" @click.stop>
+            <div class="eq-controls">
+                <button class="eq-toggle" :class="{ active: eq.enabled }" @click="eq.toggleEnabled">
+                    {{ eq.enabled ? 'ON' : 'OFF' }}
+                </button>
+                <div class="eq-preset-selector" @mouseenter="showPresetDropdown = true" @mouseleave="showPresetDropdown = false">
+                    <div class="preset-display">
+                        {{ selectedPreset }}
+                    </div>
+                    <transition name="fade">
+                        <div v-if="showPresetDropdown" class="preset-dropdown">
+                            <div
+                                v-for="preset in eq.availablePresets"
+                                :key="preset"
+                                class="preset-item"
+                                :class="{ active: preset === selectedPreset }"
+                                @click="selectPreset(preset)"
+                            >
+                                {{ preset }}
+                            </div>
+                        </div>
+                    </transition>
+                </div>
+                <button class="eq-pin-button" :class="{ pinned: isPinned }" @click="togglePin" title="Pin equalizer">
+                    <svg width="16" height="16" viewBox="0 0 16 16" fill="none">
+                        <path d="M9.5 2.5L13.5 6.5L9 11L11 13L10.5 13.5L7.5 10.5L2 16L1 15L6.5 9.5L3.5 6.5L4 6L6 8L10.5 3.5L9.5 2.5Z" fill="currentColor"/>
+                    </svg>
+                </button>
+            </div>
+            <div class="eq-sliders">
+                <div class="db-scale">
+                    <span class="db-label">+12</span>
+                    <span class="db-label">0</span>
+                    <span class="db-label">-12</span>
+                </div>
+                <div v-for="(gain, index) in eq.bands" :key="index" class="eq-slider-wrap" @wheel="(e) => handleBandWheel(index, e)">
+                    <div class="gain-value">{{ displayBands[index] > 0 ? '+' : '' }}{{ displayBands[index].toFixed(1) }}</div>
+                    <input
+                        type="range"
+                        :value="displayBands[index]"
+                        min="-12"
+                        max="12"
+                        step="0.1"
+                        @input="(e) => changeBandGain(index, e)"
+                        class="eq-slider"
+                        :style="{
+                            background: `linear-gradient(to top, #ffffff ${((displayBands[index] + 12) / 24) * 100}%, rgba(255, 255, 255, 0.1) ${((displayBands[index] + 12) / 24) * 100}%)`
+                        }"
+                    />
+                    <div class="freq-label">{{ formatFreq(frequencies[index]) }}</div>
+                </div>
+                <div class="db-scale">
+                    <span class="db-label">+12</span>
+                    <span class="db-label">0</span>
+                    <span class="db-label">-12</span>
+                </div>
+            </div>
+        </div>
+    </button>
+</template>
+
+<script setup lang="ts">
+import { ref, onMounted } from 'vue'
+import { Motion } from 'motion/vue'
+import EqualizerSvg from '@/assets/icons/equalizer.svg'
+import useEqualizer from '@/stores/equalizer'
+import { EQ_FREQUENCIES } from '@/utils/equalizer/eqPresets'
+
+const eq = useEqualizer()
+const selectedPreset = ref(eq.currentPreset)
+const frequencies = EQ_FREQUENCIES
+const animatedBands = ref<number[]>([0, 0, 0, 0, 0, 0, 0, 0])
+const isAnimating = ref(false)
+const displayBands = ref<number[]>([...eq.bands])
+const isHovered = ref(false)
+const justClicked = ref(false)
+const showPresetDropdown = ref(false)
+const isPinned = ref(false)
+
+// Load saved settings on mount
+onMounted(() => {
+    eq.loadFromLocalStorage()
+    selectedPreset.value = eq.currentPreset
+    displayBands.value = [...eq.bands]
+})
+
+const handleMouseEnter = () => {
+    if (!isHovered.value && !justClicked.value && !isPinned.value) {
+        startAnimation()
+    }
+    isHovered.value = true
+    justClicked.value = false
+}
+
+const handleMouseLeave = () => {
+    isHovered.value = false
+    if (isPinned.value) return
+}
+
+const handleClick = () => {
+    justClicked.value = true
+    eq.toggleEnabled()
+}
+
+const handleIconWheel = (event: WheelEvent) => {
+    event.preventDefault()
+    
+    const currentIndex = eq.availablePresets.findIndex(p => p === selectedPreset.value)
+    let newIndex: number
+    
+    if (event.deltaY < 0) {
+        // Scroll up - previous preset (with wrap-around)
+        newIndex = currentIndex - 1
+        if (newIndex < 0) newIndex = eq.availablePresets.length - 1
+    } else {
+        // Scroll down - next preset (with wrap-around)
+        newIndex = currentIndex + 1
+        if (newIndex >= eq.availablePresets.length) newIndex = 0
+    }
+    
+    selectedPreset.value = eq.availablePresets[newIndex]
+    eq.loadPreset(selectedPreset.value)
+    startAnimation()
+}
+
+const changeBandGain = (index: number, event: Event) => {
+    const target = event.target as HTMLInputElement
+    const value = parseFloat(target.value)
+    eq.setBandGain(index, value)
+    displayBands.value[index] = value
+    selectedPreset.value = 'Custom'
+}
+
+const onPresetChange = () => {
+    eq.loadPreset(selectedPreset.value)
+    startAnimation()
+}
+
+const selectPreset = (preset: string) => {
+    selectedPreset.value = preset
+    eq.loadPreset(preset)
+    showPresetDropdown.value = false
+    startAnimation()
+}
+
+const togglePin = () => {
+    isPinned.value = !isPinned.value
+}
+
+const startAnimation = () => {
+    if (isAnimating.value) return
+    
+    isAnimating.value = true
+    animatedBands.value = [0, 0, 0, 0, 0, 0, 0, 0]
+    
+    const startTime = performance.now()
+    const duration = 1000 // 1 second
+    const targetBands = [...eq.bands]
+    
+    const animate = (currentTime: number) => {
+        const elapsed = currentTime - startTime
+        const progress = Math.min(elapsed / duration, 1)
+        
+        // Easing function (ease-out-cubic)
+        const easeProgress = 1 - Math.pow(1 - progress, 3)
+        
+        animatedBands.value = targetBands.map(target => target * easeProgress)
+        displayBands.value = [...animatedBands.value]
+        
+        if (progress < 1) {
+            requestAnimationFrame(animate)
+        } else {
+            isAnimating.value = false
+            displayBands.value = [...eq.bands]
+        }
+    }
+    
+    requestAnimationFrame(animate)
+}
+
+const handleBandWheel = (index: number, event: WheelEvent) => {
+    event.preventDefault()
+    const delta = event.deltaY / 1000
+    const currentGain = eq.bands[index]
+    
+    // Adjust by scroll (negative delta = scroll up = increase gain)
+    let newGain = currentGain - delta * 2
+    
+    // Clamp between -12 and +12
+    newGain = Math.max(-12, Math.min(12, newGain))
+    
+    eq.setBandGain(index, newGain)
+    displayBands.value[index] = newGain
+    selectedPreset.value = 'Custom'
+}
+
+const formatFreq = (freq: number): string => {
+    if (freq >= 1000) {
+        const kHz = freq / 1000
+        return kHz % 1 === 0 ? `${kHz}k` : `${kHz.toFixed(1)}k`
+    }
+    return `${freq}`
+}
+</script>
+
+<style lang="scss">
+.equalizer {
+    position: relative;
+    background: transparent;
+    border: none;
+    cursor: pointer;
+
+    .icon {
+        height: 100%;
+        width: 100%;
+        display: grid;
+        place-items: center;
+        transition: opacity 0.3s ease;
+        
+        svg {
+            transform: scale(0.75);
+            transition: opacity 0.2s, color 0.3s ease;
+        }
+    }
+
+    &:hover .icon svg {
+        opacity: 0.7;
+    }
+&.eq-disabled .icon {
+        opacity: 0.5;
+        
+        svg {
+            color: rgba(255, 255, 255, 0.65);
+        }
+    }
+
+    &.eq-disabled .eq-popup {
+        .eq-sliders {
+            opacity: 0.5;
+            
+            .eq-slider-wrap {
+                .gain-value {
+                    color: rgba(255, 255, 255, 0.3);
+                }
+                
+                .eq-slider {
+                    opacity: 0.6;
+                }
+                
+                .freq-label {
+                    color: rgba(255, 255, 255, 0.25);
+                }
+            }
+            
+            .db-scale .db-label {
+                color: rgba(255, 255, 255, 0.2);
+            }
+        }
+    }
+
+    
+    .eq-popup {
+        position: absolute;
+        bottom: calc(100% + 20px);
+        left: 50%;
+        transform: translateX(-50%) translateY(10px);
+        background-color: $gray;
+        padding: 25px 15px;
+        border-top: 1px solid $gray3;
+        border-bottom: 1px solid $gray3;
+        border-right: 1px solid $gray3;
+        border-left: 1px solid $gray3;
+        border-radius: 0.5rem;
+        -webkit-font-smoothing: antialiased;
+        opacity: 0;
+        visibility: hidden;
+        transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
+        box-shadow: 0 8px 32px rgba(0, 0, 0, 0.4);
+        z-index: 1000;
+
+        .eq-controls {
+            display: flex;
+            align-items: center;
+            justify-content: space-between;
+            gap: 12px;
+            margin-bottom: 16px;
+            padding-bottom: 16px;
+            border-bottom: 1px solid rgba(255, 255, 255, 0.08);
+
+            .eq-toggle {
+                padding: 6px 16px;
+                background: $gray !important;
+                border: 1.5px solid rgba(255, 255, 255, 0.15) !important;
+                border-radius: 0.5rem;
+                color: #af3131ff !important;
+                font-size: 11px;
+                font-weight: 700;
+                letter-spacing: 0.5px;
+                cursor: pointer;
+                transition: all 0.2s;
+
+                &.active {
+                    color: #000000 !important;
+                    background: #f5f5f5 !important;
+                    border-color: #f5f5f5 !important;
+                }
+            }
+
+            .eq-preset-selector {
+                position: relative;
+                flex: 1;
+                display: flex;
+                justify-content: center;
+                align-items: center;
+                cursor: pointer;
+
+                .preset-display {
+                    padding: 8px 12px;
+                    color: rgba(255, 255, 255, 0.95);
+                    font-size: 13px;
+                    font-weight: 600;
+                    text-align: center;
+                    transition: color 0.2s ease;
+                }
+
+                &:hover .preset-display {
+                    color: rgba(255, 255, 255, 1);
+                }
+
+                .preset-dropdown {
+                    position: absolute;
+                    top: calc(100% + 5px);
+                    left: 0;
+                    right: 0;
+                    background: $context;
+                    border-radius: 0.5rem;
+                    padding: $small;
+                    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.4);
+                    z-index: 1001;
+                    max-height: 240px;
+                    overflow-y: auto;
+
+                    .preset-item {
+                        padding: 0.4rem 0.8rem;
+                        border-radius: $small;
+                        cursor: pointer;
+                        transition: background-color 0.2s ease;
+                        font-size: 12px;
+                        color: rgba(255, 255, 255, 0.9);
+
+                        &:hover {
+                            background: $darkestblue;
+                        }
+
+                        &.active {
+                            background: rgba(255, 255, 255, 0.1);
+                            color: rgba(255, 255, 255, 1);
+                        }
+                    }
+                }
+            }
+
+            .eq-pin-button {
+                padding: 6px 8px;
+                background: $gray !important;
+                border: 1.5px solid rgba(255, 255, 255, 0.15) !important;
+                border-radius: 0.5rem;
+                color: rgba(255, 255, 255, 0.5) !important;
+                cursor: pointer;
+                transition: all 0.2s;
+                display: flex;
+                align-items: center;
+                justify-content: center;
+
+                svg {
+                    width: 14px;
+                    height: 14px;
+                    transform: rotate(-45deg);
+                }
+
+                &.pinned {
+                    color: #000000 !important;
+                    background: #f5f5f5 !important;
+                    border-color: #f5f5f5 !important;
+                }
+            }
+        }
+
+        .fade-enter-active,
+        .fade-leave-active {
+            transition: opacity 0.2s ease;
+        }
+
+        .fade-enter-from,
+        .fade-leave-to {
+            opacity: 0;
+        }
+
+        .eq-sliders {
+            display: flex;
+            gap: 15px;
+            align-items: flex-end;
+            transition: opacity 0.3s ease;
+
+            .db-scale {
+                display: flex;
+                flex-direction: column;
+                justify-content: space-between;
+                height: 300px;
+                padding-right: 8px;
+                padding-left: 8px;
+                margin-bottom: 24px;
+
+                .db-label {
+                    font-size: 9px;
+                    font-weight: 600;
+                    color: rgba(255, 255, 255, 0.4);
+                    font-family: 'Courier New', monospace;
+                    line-height: 1;
+                    transition: color 0.3s ease;
+                }
+            }
+
+            .eq-slider-wrap {
+                display: flex;
+                flex-direction: column;
+                align-items: center;
+                gap: 8px;
+
+                .gain-value {
+                    font-size: 10px;
+                    font-weight: 600;
+                    color: rgba(255, 255, 255, 0.6);
+                    min-width: 32px;
+                    transition: color 0.3s ease;
+                    text-align: center;
+                    font-family: 'Courier New', monospace;
+                }
+
+                .eq-slider {
+                    -webkit-appearance: none;
+                    appearance: none;
+                    writing-mode: vertical-lr;
+                    direction: rtl;
+                    width: 3px;
+                    height: 300px;
+                    border-radius: 1px;
+                    outline: none;
+                    cursor: pointer;
+                    position: relative;
+                    transition: opacity 0.3s ease;
+
+                    &:hover {
+                        background: rgba(255, 255, 255, 0.15);
+                    }
+
+                    &::-webkit-slider-thumb {
+                        -webkit-appearance: none;
+                        appearance: none;
+                        width: 1rem;
+                        height: 1rem;
+                        background: #ffffff;
+                        border: none;
+                        border-radius: 50%;
+                        cursor: grab;
+                        box-shadow: none;
+                        transition: all 0.2s;
+
+                        &:hover {
+                            transform: scale(1.15);
+                        }
+
+                        &:active {
+                            cursor: grabbing;
+                            transform: scale(1.05);
+                        }
+                    }
+
+                    &::-moz-range-thumb {
+                        width: 1rem;
+                        height: 1rem;
+                        background: #ffffff;
+                        border: none;
+                        border-radius: 50%;
+                        cursor: grab;
+                        box-shadow: none;
+                        transition: all 0.2s;
+
+                        &:hover {
+                            transform: scale(1.15);
+                        }
+
+                        &:active {
+                            cursor: grabbing;
+                            transform: scale(1.05);
+                        }
+                    }
+                }
+
+                .freq-label {
+                    font-size: 10px;
+                    font-weight: 600;
+                    color: rgba(255, 255, 255, 0.5);
+                    text-transform: uppercase;
+                    letter-spacing: 0.3px;
+                    transition: color 0.3s ease;
+                }
+            }
+        }
+    }
+
+    &:hover .eq-popup,
+    .eq-popup.pinned {
+        opacity: 1;
+        visibility: visible;
+        transform: translateX(-50%) translateY(0);
+    }
+}
+</style>
diff --git a/src/components/BottomBar/Right.vue b/src/components/BottomBar/Right.vue
index 72f8f31..2f16d9b 100644
--- a/src/components/BottomBar/Right.vue
+++ b/src/components/BottomBar/Right.vue
@@ -1,6 +1,7 @@
 <template>
     <div class="right-group">
         <LyricsButton />
+        <Equalizer />
         <Volume />
         <button
             class="repeat"
@@ -32,6 +33,7 @@ import RepeatAllSvg from '@/assets/icons/repeat.svg'
 import ShuffleSvg from '@/assets/icons/shuffle.svg'
 import HeartSvg from '../shared/HeartSvg.vue'
 import LyricsButton from '../shared/LyricsButton.vue'
+import Equalizer from './Equalizer.vue'
 import Volume from './Volume.vue'
 
 const queue = useQueue()
@@ -50,7 +52,7 @@ defineEmits<{
 .right-group {
     display: grid;
     justify-content: flex-end;
-    grid-template-columns: repeat(5, max-content);
+    grid-template-columns: repeat(6, max-content);
     align-items: center;
     height: 4rem;
 
diff --git a/src/stores/equalizer.ts b/src/stores/equalizer.ts
new file mode 100644
index 0000000..fc58403
--- /dev/null
+++ b/src/stores/equalizer.ts
@@ -0,0 +1,183 @@
+import { defineStore } from 'pinia'
+import { equalizerEngine } from '@/utils/equalizer/equalizer'
+import { EQ_PRESETS, getPreset } from '@/utils/equalizer/eqPresets'
+
+export const useEqualizer = defineStore('equalizer', {
+    state: () => ({
+        enabled: false, // EQ starts disabled
+        bands: [0, 0, 0, 0, 0, 0, 0, 0], // 8 bands, all at 0dB initially
+        currentPreset: 'Flat',
+    }),
+    
+    getters: {
+        /**
+         * Check if any band is modified from flat (0dB)
+         */
+        isModified(): boolean {
+            return this.bands.some(gain => gain !== 0)
+        },
+        
+        /**
+         * Get available presets
+         */
+        availablePresets(): string[] {
+            return EQ_PRESETS.map(p => p.name)
+        },
+    },
+    
+    actions: {
+        /**
+         * Set gain for a specific band
+         * Auto-enables EQ if user changes any band
+         */
+        setBandGain(bandIndex: number, gainDB: number) {
+            if (bandIndex < 0 || bandIndex >= 8) return
+            
+            const clampedGain = Math.max(-12, Math.min(12, gainDB))
+            this.bands[bandIndex] = clampedGain
+            
+            // Auto-enable EQ when user modifies any band
+            if (!this.enabled && clampedGain !== 0) {
+                this.enabled = true
+                equalizerEngine.setEnabled(true)
+            }
+            
+            // Apply to audio engine if EQ is enabled
+            if (this.enabled) {
+                equalizerEngine.setBandGain(bandIndex, clampedGain)
+            }
+            
+            // Save to localStorage
+            this.saveToLocalStorage()
+        },
+        
+        /**
+         * Toggle EQ on/off
+         * When off, keeps values but bypasses processing
+         */
+        toggleEnabled() {
+            this.enabled = !this.enabled
+            
+            if (this.enabled) {
+                // Apply current bands to audio engine
+                equalizerEngine.setEnabled(true)
+                equalizerEngine.setAllBands(this.bands)
+            } else {
+                // Bypass EQ (set all gains to 0 in engine)
+                equalizerEngine.setEnabled(false)
+            }
+            
+            this.saveToLocalStorage()
+        },
+        
+        /**
+         * Load a preset
+         */
+        loadPreset(presetName: string) {
+            const preset = getPreset(presetName)
+            this.bands = [...preset.gains]
+            this.currentPreset = presetName
+            
+            // Auto-enable EQ if preset is not flat
+            if (this.isModified && !this.enabled) {
+                this.enabled = true
+            }
+            
+            // Apply to audio engine
+            if (this.enabled) {
+                equalizerEngine.setEnabled(true)
+                equalizerEngine.setAllBands(this.bands)
+            }
+            
+            this.saveToLocalStorage()
+        },
+        
+        /**
+         * Reset all bands to 0 (flat)
+         */
+        reset() {
+            this.bands = [0, 0, 0, 0, 0, 0, 0, 0]
+            this.currentPreset = 'Flat'
+            
+            if (this.enabled) {
+                equalizerEngine.setAllBands(this.bands)
+            }
+            
+            this.saveToLocalStorage()
+        },
+        
+        /**
+         * Load EQ settings from localStorage
+         */
+        loadFromLocalStorage() {
+            try {
+                const savedEnabled = localStorage.getItem('eq_enabled')
+                const savedBands = localStorage.getItem('eq_bands')
+                const savedPreset = localStorage.getItem('eq_preset')
+                
+                if (savedEnabled !== null) {
+                    this.enabled = JSON.parse(savedEnabled)
+                }
+                
+                if (savedBands) {
+                    const parsed = JSON.parse(savedBands)
+                    if (Array.isArray(parsed) && parsed.length === 8) {
+                        this.bands = parsed
+                    }
+                }
+                
+                if (savedPreset) {
+                    this.currentPreset = savedPreset
+                }
+                
+                // Apply to audio engine if enabled
+                if (this.enabled) {
+                    equalizerEngine.setEnabled(true)
+                    equalizerEngine.setAllBands(this.bands)
+                }
+            } catch (error) {
+                console.warn('Failed to load EQ settings from localStorage:', error)
+            }
+        },
+        
+        /**
+         * Save EQ settings to localStorage
+         */
+        saveToLocalStorage() {
+            try {
+                localStorage.setItem('eq_enabled', JSON.stringify(this.enabled))
+                localStorage.setItem('eq_bands', JSON.stringify(this.bands))
+                localStorage.setItem('eq_preset', this.currentPreset)
+                
+                // If custom preset, save it
+                if (this.currentPreset === 'Custom') {
+                    localStorage.setItem('eq_custom_preset', JSON.stringify(this.bands))
+                }
+            } catch (error) {
+                console.warn('Failed to save EQ settings to localStorage:', error)
+            }
+        },
+        
+        /**
+         * Load custom preset from localStorage if it exists
+         */
+        loadCustomPreset() {
+            try {
+                const customPreset = localStorage.getItem('eq_custom_preset')
+                if (customPreset) {
+                    const gains = JSON.parse(customPreset)
+                    if (Array.isArray(gains) && gains.length === 8) {
+                        this.bands = gains
+                        this.currentPreset = 'Custom'
+                        return true
+                    }
+                }
+            } catch (error) {
+                console.warn('Failed to load custom preset:', error)
+            }
+            return false
+        },
+    },
+})
+
+export default useEqualizer
diff --git a/src/stores/player.ts b/src/stores/player.ts
index ee4141c..3d53d1a 100644
--- a/src/stores/player.ts
+++ b/src/stores/player.ts
@@ -13,6 +13,7 @@ import useTracker from './tracker'
 import { getBaseUrl, paths } from '@/config'
 import updateMediaNotif from '@/helpers/mediaNotification'
 import { crossFade } from '@/utils/audio/crossFade'
+import { equalizerEngine } from '@/utils/equalizer/equalizer'
 
 class AudioSource {
     private sources: HTMLAudioElement[] = []
@@ -20,6 +21,7 @@ class AudioSource {
     private handlers: { [key: string]: (err: Event | string) => void } = {}
     private requiredAPBlockBypass: boolean = false
     settings: ReturnType<typeof useSettings> | null = null
+    private audioContextInitialized: boolean = false
 
     constructor() {
         this.sources = [new Audio(), new Audio()]
@@ -31,6 +33,27 @@ class AudioSource {
         })
 
         this.requiredAPBlockBypass = true
+        this.initializeWebAudio()
+    }
+
+    /**
+     * Initialize Web Audio API for equalizer
+     */
+    private initializeWebAudio() {
+        try {
+            const audioContext = new AudioContext()
+            equalizerEngine.initialize(audioContext)
+            
+            // Connect both audio sources to the EQ chain
+            this.sources.forEach(audio => {
+                equalizerEngine.connectAudioElement(audio)
+            })
+            
+            this.audioContextInitialized = true
+        } catch (error) {
+            console.warn('Failed to initialize Web Audio API:', error)
+            this.audioContextInitialized = false
+        }
     }
 
     get standbySource() {
@@ -117,6 +140,11 @@ class AudioSource {
             .catch(() => {})
 
         this.requiredAPBlockBypass = false
+        
+        // Resume audio context for iOS/Safari
+        if (this.audioContextInitialized) {
+            equalizerEngine.resumeContext()
+        }
     }
 }
 
diff --git a/src/utils/equalizer/eqPresets.ts b/src/utils/equalizer/eqPresets.ts
new file mode 100644
index 0000000..65e713a
--- /dev/null
+++ b/src/utils/equalizer/eqPresets.ts
@@ -0,0 +1,103 @@
+/**
+ * Equalizer preset configurations
+ * 8 bands: 60Hz, 150Hz, 400Hz, 1kHz, 2.4kHz, 6kHz, 12kHz, 15kHz
+ * Values in dB (-12 to +12)
+ */
+
+import presetsData from './presets.json'
+
+// Constants for band configuration
+export const EQ_BAND_COUNT = 8
+export const EQ_GAIN_MIN = -12
+export const EQ_GAIN_MAX = 12
+
+// Readonly frequency array - prevents accidental mutations
+export const EQ_FREQUENCIES = [60, 150, 400, 1000, 2400, 6000, 12000, 15000] as const
+
+// Type-safe gains array with exactly 8 bands
+export type EQGains = readonly [number, number, number, number, number, number, number, number]
+
+export interface EQPreset {
+    name: string
+    gains: EQGains
+}
+
+// Default flat preset as fallback
+const DEFAULT_PRESET: EQPreset = {
+    name: 'Flat',
+    gains: [0, 0, 0, 0, 0, 0, 0, 0] as EQGains
+}
+
+/**
+ * Validate presets data structure
+ */
+function validatePresetsData(data: any): data is { presets: EQPreset[] } {
+    return (
+        data &&
+        Array.isArray(data.presets) &&
+        data.presets.every((p: any) => 
+            typeof p.name === 'string' &&
+            Array.isArray(p.gains) &&
+            p.gains.length === EQ_BAND_COUNT &&
+            p.gains.every((g: any) => 
+                typeof g === 'number' && 
+                g >= EQ_GAIN_MIN && 
+                g <= EQ_GAIN_MAX
+            )
+        )
+    )
+}
+
+/**
+ * Type guard for gains array
+ */
+export function isValidGains(gains: unknown): gains is EQGains {
+    return (
+        Array.isArray(gains) &&
+        gains.length === EQ_BAND_COUNT &&
+        gains.every(g => typeof g === 'number' && g >= EQ_GAIN_MIN && g <= EQ_GAIN_MAX)
+    )
+}
+
+/**
+ * Create validated EQ gains with clamping
+ */
+export function createEQGains(gains: number[]): EQGains {
+    if (gains.length !== EQ_BAND_COUNT) {
+        throw new Error(`Expected ${EQ_BAND_COUNT} bands, got ${gains.length}`)
+    }
+    
+    return gains.map(g => 
+        Math.max(EQ_GAIN_MIN, Math.min(EQ_GAIN_MAX, g))
+    ) as EQGains
+}
+
+// Load and validate presets with fallback
+export const EQ_PRESETS: EQPreset[] = validatePresetsData(presetsData) 
+    ? presetsData.presets 
+    : [DEFAULT_PRESET]
+
+/**
+ * Get preset by name with safe fallback
+ */
+export function getPreset(name: string): EQPreset {
+    const preset = EQ_PRESETS.find(p => p.name === name)
+    
+    if (preset) return preset
+    
+    if (EQ_PRESETS.length > 0) return EQ_PRESETS[0]
+    
+    // Fallback if presets array is somehow empty
+    return DEFAULT_PRESET
+}
+
+/**
+ * Format frequency for display (e.g., 1000 -> "1kHz")
+ */
+export function formatFrequency(freq: number): string {
+    if (freq >= 1000) {
+        const kHz = freq / 1000
+        return kHz % 1 === 0 ? `${kHz}kHz` : `${kHz.toFixed(1)}kHz`
+    }
+    return `${freq}Hz`
+}
diff --git a/src/utils/equalizer/equalizer.ts b/src/utils/equalizer/equalizer.ts
new file mode 100644
index 0000000..5e75337
--- /dev/null
+++ b/src/utils/equalizer/equalizer.ts
@@ -0,0 +1,145 @@
+import { EQ_FREQUENCIES } from './eqPresets'
+
+/**
+ * Web Audio API Equalizer Engine
+ * Creates and manages 8-band parametric equalizer using BiquadFilterNode
+ */
+export class EqualizerEngine {
+    private audioContext: AudioContext | null = null
+    private filters: BiquadFilterNode[] = []
+    private sourceNodes: Map<HTMLAudioElement, MediaElementAudioSourceNode> = new Map()
+    private enabled: boolean = false
+
+    /**
+     * Initialize the audio context and create filter nodes
+     */
+    initialize(audioContext: AudioContext) {
+        this.audioContext = audioContext
+
+        // Create 8 biquad filters for each frequency band
+        this.filters = EQ_FREQUENCIES.map(freq => {
+            const filter = audioContext.createBiquadFilter()
+            filter.type = 'peaking'
+            filter.frequency.value = freq
+            filter.Q.value = 1.0 // Q factor (bandwidth)
+            filter.gain.value = 0 // neutral (no boost/cut)
+            return filter
+        })
+
+        // Chain filters together
+        for (let i = 0; i < this.filters.length - 1; i++) {
+            this.filters[i].connect(this.filters[i + 1])
+        }
+    }
+
+    /**
+     * Connect an audio element to the EQ chain
+     * HTMLAudioElement → EQ Filters → Destination
+     */
+    connectAudioElement(audioElement: HTMLAudioElement): MediaElementAudioSourceNode | null {
+        if (!this.audioContext) return null
+
+        // Check if already connected
+        if (this.sourceNodes.has(audioElement)) {
+            return this.sourceNodes.get(audioElement)!
+        }
+
+        try {
+            // Create source node from audio element
+            const sourceNode = this.audioContext.createMediaElementSource(audioElement)
+            this.sourceNodes.set(audioElement, sourceNode)
+
+            // Connect: source → filter chain → destination
+            if (this.filters.length > 0) {
+                sourceNode.connect(this.filters[0])
+                this.filters[this.filters.length - 1].connect(this.audioContext.destination)
+            } else {
+                // Fallback: direct connection if no filters
+                sourceNode.connect(this.audioContext.destination)
+            }
+
+            return sourceNode
+        } catch (error) {
+            console.warn('Failed to connect audio element to EQ:', error)
+            return null
+        }
+    }
+
+    /**
+     * Update a specific EQ band gain
+     * @param bandIndex - Index of the band (0-7)
+     * @param gainDB - Gain in decibels (-12 to +12)
+     */
+    setBandGain(bandIndex: number, gainDB: number) {
+        if (bandIndex < 0 || bandIndex >= this.filters.length) return
+
+        const clampedGain = Math.max(-12, Math.min(12, gainDB))
+        this.filters[bandIndex].gain.value = clampedGain
+    }
+
+    /**
+     * Update all bands at once
+     * @param gains - Array of 8 gain values in dB
+     */
+    setAllBands(gains: number[]) {
+        gains.forEach((gain, index) => {
+            this.setBandGain(index, gain)
+        })
+    }
+
+    /**
+     * Enable or disable EQ (bypass mode)
+     * When disabled, all gains are set to 0
+     */
+    setEnabled(enabled: boolean) {
+        this.enabled = enabled
+
+        if (!enabled) {
+            // Bypass: set all gains to 0 (neutral)
+            this.filters.forEach(filter => {
+                filter.gain.value = 0
+            })
+        }
+    }
+
+    /**
+     * Get current gain for a specific band
+     */
+    getBandGain(bandIndex: number): number {
+        if (bandIndex < 0 || bandIndex >= this.filters.length) return 0
+        return this.filters[bandIndex].gain.value
+    }
+
+    /**
+     * Get all current gains
+     */
+    getAllGains(): number[] {
+        return this.filters.map(filter => filter.gain.value)
+    }
+
+    /**
+     * Check if EQ is enabled
+     */
+    isEnabled(): boolean {
+        return this.enabled
+    }
+
+    /**
+     * Resume audio context (required for iOS/Safari)
+     */
+    async resumeContext() {
+        if (this.audioContext?.state === 'suspended') {
+            await this.audioContext.resume()
+        }
+    }
+
+    /**
+     * Get audio context
+     */
+    getContext(): AudioContext | null {
+        return this.audioContext
+    }
+}
+
+// Singleton instance
+export const equalizerEngine = new EqualizerEngine()
diff --git a/src/utils/equalizer/presets.json b/src/utils/equalizer/presets.json
new file mode 100644
index 0000000..fc3f4b2
--- /dev/null
+++ b/src/utils/equalizer/presets.json
@@ -0,0 +1,48 @@
+{
+  "presets": [
+    {
+      "name": "Flat",
+      "gains": [0, 0, 0, 0, 0, 0, 0, 0]
+    },
+    {
+      "name": "Rock",
+      "gains": [4.8, 3.2, -3.2, -4.8, -1.6, 2.4, 5.6, 6.8]
+    },
+    {
+      "name": "Pop",
+      "gains": [-1.6, 3.2, 4.8, 5.2, 3.6, 0, -1.6, -1.6]
+    },
+    {
+      "name": "Jazz",
+      "gains": [2.4, 1.6, 0, 1.6, -1.6, -1.6, 0, 2.4]
+    },
+    {
+      "name": "Classical",
+      "gains": [3.2, 2.4, -1.6, -1.6, 0, 1.6, 2.4, 3.2]
+    },
+    {
+      "name": "Bass Boost",
+      "gains": [8.0, 6.4, 4.8, 2.4, 0, 0, 0, 0]
+    },
+    {
+      "name": "Treble Boost",
+      "gains": [0, 0, 0, 0, 2.4, 4.8, 6.4, 8.0]
+    },
+    {
+      "name": "Vocal",
+      "gains": [-1.6, -2.4, -2.4, 1.6, 4.0, 4.0, 2.4, 0]
+    },
+    {
+      "name": "Electronic",
+      "gains": [3.2, 4.8, 1.6, 0, -3.2, 2.4, 4.0, 4.8]
+    },
+    {
+      "name": "Acoustic",
+      "gains": [4.0, 3.2, 1.6, 0.8, 1.6, 2.4, 3.2, 2.4]
+    },
+        {
+      "name": "Deep",
+      "gains": [12.0, 0.2, 0.6, 0.8, 0.6, 0.4, 0.2, -12.0]
+    }
+  ]
+}