{"product_id":"aunex-ac1500k4-4-channel-car-amplifier-250w-rms","title":"AC1500K4","description":"\u003cstyle\u003e\n  :root {\n    --red:       #8b0000;\n    --red-dim:   #600000;\n    --page-bg:   #ffffff;\n    --surface-2: #f5f5f2;\n    --surface-3: #eeeeea;\n    --border:    #ddddd8;\n    --ink:       #111110;\n    --ink-soft:  #333330;\n    --mid-text:  #666660;\n    --mono:      'Share Tech Mono', monospace;\n    --red-light: #f0e4e4;\n    --red-mid:   #d4a0a0;\n  }\n\n  *, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }\n\n  .seo-card {\n    background: var(--page-bg);\n    border-top: 1px solid var(--border);\n    padding: 100px max(72px, calc((100% - 1440px) \/ 2 + 72px));\n    font-size: 16px;\n  }\n\n  .seo-card-inner {\n    display: grid;\n    grid-template-columns: 1fr;\n    gap: 60px;\n  }\n\n  \/* ─── LEAD ─── *\/\n  .seo-lead-tag {\n    font-family: var(--mono);\n    font-size: 12px;\n    color: var(--red);\n    letter-spacing: 0.22em;\n    text-transform: uppercase;\n    display: block;\n    margin-bottom: 16px;\n  }\n\n  .seo-lead-title {\n    font-family: 'Barlow Condensed', sans-serif;\n    font-weight: 800;\n    font-size: clamp(32px, 4vw, 52px);\n    line-height: 1;\n    text-transform: uppercase;\n    letter-spacing: 0.01em;\n    color: var(--ink);\n    margin-bottom: 24px;\n  }\n\n  .seo-lead-title .red { color: var(--red); }\n\n  .seo-lead-intro {\n    font-size: 15.5px;\n    line-height: 1.8;\n    color: var(--ink-soft);\n    max-width: 820px;\n  }\n\n  .seo-lead-intro strong { color: var(--ink); font-weight: 600; }\n\n  \/* ─── BODY GRID ─── *\/\n  .seo-body {\n    display: grid;\n    grid-template-columns: repeat(3, 1fr);\n    gap: 2px;\n    background: var(--border);\n  }\n\n  .seo-block {\n    background: var(--page-bg);\n    padding: 32px 28px;\n    transition: background 0.2s;\n    position: relative;\n    overflow: hidden;\n  }\n\n  .seo-block::after {\n    content: '';\n    position: absolute;\n    bottom: 0; left: 0; right: 0;\n    height: 2px;\n    background: var(--red);\n    transform: scaleX(0);\n    transform-origin: left;\n    transition: transform 0.3s ease;\n  }\n\n  .seo-block:hover { background: var(--surface-2); }\n  .seo-block:hover::after { transform: scaleX(1); }\n\n  .seo-block h3 {\n    font-family: 'Barlow Condensed', sans-serif;\n    font-weight: 600;\n    font-size: 16px;\n    text-transform: uppercase;\n    letter-spacing: 0.06em;\n    color: var(--ink);\n    margin-bottom: 10px;\n  }\n\n  .seo-block p {\n    font-size: 13.5px;\n    line-height: 1.7;\n    color: var(--mid-text);\n    font-family: 'Open Sans', sans-serif;\n    font-weight: 300;\n  }\n\n  \/* ─── KEYWORD TAGS ─── *\/\n  .seo-tags {\n    display: flex;\n    flex-wrap: wrap;\n    gap: 8px;\n    padding-top: 8px;\n    border-top: 1px solid var(--border);\n  }\n\n  .seo-tag {\n    font-family: var(--mono);\n    font-size: 11px;\n    letter-spacing: 0.12em;\n    text-transform: uppercase;\n    color: var(--mid-text);\n    border: 1px solid var(--border);\n    padding: 6px 14px;\n    background: var(--surface-2);\n  }\n\n  \/* ─── RESPONSIVE ─── *\/\n  @media (max-width: 900px) {\n    .seo-card { padding: 72px 24px; }\n    .seo-body { grid-template-columns: 1fr; }\n  }\n\u003c\/style\u003e\n\n\u003csection class=\"seo-card\"\u003e\n  \u003cdiv class=\"seo-card-inner\"\u003e\n\n    \u003c!-- LEAD --\u003e\n    \u003cdiv class=\"seo-lead\"\u003e\n      \u003cspan class=\"seo-lead-tag\"\u003e◆ AC Series · Full-Range Digital 4-Channel · 2026 Edition\u003c\/span\u003e\n      \u003ch2 class=\"seo-lead-title\"\u003eAUNEX AC1500\u003cspan class=\"red\"\u003eK4\u003c\/span\u003e — 250W × 4 RMS\u003cbr\u003e4-Channel Car Amplifier | OEM Drop-In Ready\u003c\/h2\u003e\n      \u003cp class=\"seo-lead-intro\"\u003eThe AUNEX AC1500K4 is a full-range digital 4-channel amplifier built for high-output front and rear staging. Rated at \u003cstrong\u003e250W RMS per channel at 4 ohms\u003c\/strong\u003e and \u003cstrong\u003e375W RMS per channel at 2 ohms\u003c\/strong\u003e — all four channels driven simultaneously, independently verified — it delivers consistent output in every configuration. Bridge any pair for 750W RMS. With DC auto turn-on and high-level inputs, it installs cleanly into factory systems without an aftermarket head unit.\u003c\/p\u003e\n    \u003c\/div\u003e\n\n    \u003c!-- BODY BLOCKS --\u003e\n    \u003cdiv class=\"seo-body\"\u003e\n\n      \u003cdiv class=\"seo-block\"\u003e\n        \u003ch3\u003eIndependently Verified RMS — All 4 Channels\u003c\/h3\u003e\n        \u003cp\u003e250W RMS per channel at 4Ω. 375W per channel at 2Ω. 750W per pair bridged at 4Ω. All four channels tested simultaneously at rated load — not one channel driven while the others idle. What’s on the spec sheet is what comes out of all four terminals, in every configuration.\u003c\/p\u003e\n      \u003c\/div\u003e\n\n      \u003cdiv class=\"seo-block\"\u003e\n        \u003ch3\u003eFour Channels. Any Configuration.\u003c\/h3\u003e\n        \u003cp\u003eRun all four channels for a complete front and rear stage at 250W RMS each. Bridge to two channels for 750W RMS stereo — powerful enough for a subwoofer while the remaining pair handles your front stage. Or bridge one pair for a dedicated sub output and run the other two full-range. The AC1500K4 adapts to the build.\u003c\/p\u003e\n      \u003c\/div\u003e\n\n      \u003cdiv class=\"seo-block\"\u003e\n        \u003ch3\u003eOEM Drop-In — DC Auto Turn-On\u003c\/h3\u003e\n        \u003cp\u003eHigh-level inputs accommodate factory OEM source units directly — no aftermarket head unit required. DC auto turn-on powers the amplifier reliably with the vehicle regardless of whether a remote turn-on wire is available, making the AC1500K4 a clean, no-compromise upgrade for stock systems. Input sensitivity spans 400mV to 20V.\u003c\/p\u003e\n      \u003c\/div\u003e\n\n      \u003cdiv class=\"seo-block\"\u003e\n        \u003ch3\u003eWide-Range HPF and LPF — 18dB\/Octave\u003c\/h3\u003e\n        \u003cp\u003eHigh-pass filtering from 400Hz to 4kHz and low-pass filtering from 40Hz to 400Hz give surgical crossover control over every channel — enough range to integrate tweeters, mid-bass drivers, and a subwoofer precisely, without a separate outboard processor. The 18dB\/octave slope delivers a steeper, more controlled rolloff than most 4-channel amplifiers at this price point.\u003c\/p\u003e\n      \u003c\/div\u003e\n\n      \u003cdiv class=\"seo-block\"\u003e\n        \u003ch3\u003eSelf-Recovering 4-Way Protection\u003c\/h3\u003e\n        \u003cp\u003eThermal shutdown, short-circuit, over-voltage, and under-voltage protection operate across all four channels independently. Short-circuit protection on the AC1500K4 is self-recovering — the amplifier detects the fault, shuts down the affected channel, and resumes automatically once the condition clears. No manual reset. No trip to the trunk. Soft on\/off delay eliminates speaker thump at startup and shutdown.\u003c\/p\u003e\n      \u003c\/div\u003e\n\n      \u003cdiv class=\"seo-block\"\u003e\n        \u003ch3\u003e4-Layer SMD PCB Construction\u003c\/h3\u003e\n        \u003cp\u003eWhere most 4-channel amplifiers at this price point use a 2-layer PCB, the AC1500K4 is built on a 4-layer surface-mount design. Dedicated internal power and ground planes reduce impedance across all four output stages, improve thermal dissipation at 84% efficiency, and deliver structural rigidity that holds up to vehicle vibration over the long term.\u003c\/p\u003e\n      \u003c\/div\u003e\n\n    \u003c\/div\u003e\n\n    \u003c!-- KEYWORD TAGS --\u003e\n    \u003cdiv class=\"seo-tags\"\u003e\n      \u003cspan class=\"seo-tag\"\u003e4-Channel Car Amplifier\u003c\/span\u003e\n      \u003cspan class=\"seo-tag\"\u003e250W x 4 RMS\u003c\/span\u003e\n      \u003cspan class=\"seo-tag\"\u003eFull-Range Car Amp\u003c\/span\u003e\n      \u003cspan class=\"seo-tag\"\u003eOEM Integration Amp\u003c\/span\u003e\n      \u003cspan class=\"seo-tag\"\u003eBridgeable 4-Channel\u003c\/span\u003e\n      \u003cspan class=\"seo-tag\"\u003e750W Bridged\u003c\/span\u003e\n      \u003cspan class=\"seo-tag\"\u003eLab-Verified Power\u003c\/span\u003e\n      \u003cspan class=\"seo-tag\"\u003eAC Series 2026\u003c\/span\u003e\n    \u003c\/div\u003e\n\n  \u003c\/div\u003e\n\u003c\/section\u003e\n","brand":"AUNEX","offers":[{"title":"Default Title","offer_id":45043990265953,"sku":null,"price":0.0,"currency_code":"USD","in_stock":false}],"url":"https:\/\/aunexusa.com\/products\/aunex-ac1500k4-4-channel-car-amplifier-250w-rms","provider":"AUNEX","version":"1.0","type":"link"}