{"product_id":"soundqubed-s1-1250-s-series-monoblock-amplifier","title":"SoundQubed S1-1250 S Series Monoblock Amplifier","description":"\u003ch2\u003e\n\u003cstrong\u003eSoundQubed S1-1250\u003c\/strong\u003e — 1,260W Mono Amplifier | S-Series | Class D | 1 Ohm Stable\u003c\/h2\u003e\n\n\u003cp\u003eThe \u003cstrong\u003eSoundQubed S1-1250\u003c\/strong\u003e is a compact, efficient Class D monoblock amplifier delivering \u003cstrong\u003e1,260W RMS at 1 ohm (14.4V)\u003c\/strong\u003e — and pushing close to \u003cstrong\u003e1,500W at 16V\u003c\/strong\u003e — in a chassis that measures just \u003cstrong\u003e11.8\" x 7.8\" x 2.2\"\u003c\/strong\u003e. Part of SoundQubed’s S-Series lineup, the S1-1250 is engineered for enthusiasts who want real, reliable bass without overbuilding their system. It’s the perfect match for a pair of HDS2.2 Series subwoofers or a single HDS3.1 or HDS3.2 — with headroom to spare for daily listening and weekend demos alike.\u003c\/p\u003e\n\n\u003cp\u003eThe S1-1250 features an \u003cstrong\u003eon-board low-pass filter (20–200 Hz)\u003c\/strong\u003e for precise frequency control, a \u003cstrong\u003esubsonic filter (10–50 Hz)\u003c\/strong\u003e to protect your drivers from extreme low-resonance distortion, and a \u003cstrong\u003eclipping indicator on the bass knob\u003c\/strong\u003e so you always know exactly where your gain is set. Input sensitivity runs from \u003cstrong\u003e0.15V to 5V\u003c\/strong\u003e for compatibility with virtually any head unit or DSP. Power connections use \u003cstrong\u003e4-gauge set screw terminals\u003c\/strong\u003e for clean current flow, and \u003cstrong\u003e10-gauge speaker terminals\u003c\/strong\u003e ensure consistent voltage delivery to your subwoofer. And when you’re ready to go bigger — the S1-1250 is \u003cstrong\u003estrappable\u003c\/strong\u003e, so you can link two units for even more output.\u003c\/p\u003e\n\n\u003cp\u003eOperating across a wide \u003cstrong\u003e8.5V–16V\u003c\/strong\u003e working voltage range, the S1-1250 is a versatile, dependable daily driver amplifier that delivers real bass performance at a price point that makes sense. Save money, get more bass.\u003c\/p\u003e\n\n\u003ch2\u003eWhy Choose the SoundQubed S1-1250?\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003e1,260W RMS @ 1 Ohm (14.4V) \/ ~1,500W @ 16V\u003c\/strong\u003e — Serious output for a compact S-Series monoblock — more than enough for most daily driver subwoofer builds.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eClass D Efficiency\u003c\/strong\u003e — High-efficiency design minimizes heat and maximizes power delivery to your subwoofers.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eStrappable\u003c\/strong\u003e — Link two S1-1250 units for even more output when your build demands it.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eClipping Indicator on Bass Knob\u003c\/strong\u003e — Know exactly where your gain is set and avoid distortion — a feature that protects your subwoofers and your ears.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eVariable LPF (20–200 Hz) + Subsonic Filter (10–50 Hz)\u003c\/strong\u003e — Precise crossover and subsonic control for optimal tuning and driver protection.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003e4GA Power Terminals + 10GA Speaker Terminals\u003c\/strong\u003e — Clean current flow and consistent voltage delivery for reliable daily performance.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003e8.5V–16V Working Voltage Range\u003c\/strong\u003e — Compatible with stock and upgraded electrical systems alike.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCompact 11.8\" x 7.8\" x 2.2\" Chassis\u003c\/strong\u003e — Fits virtually anywhere — trunk, under seat, or custom enclosure builds.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eAmplifier \u0026amp; Subwoofer Recommendations\u003c\/h2\u003e\n\n\u003cp\u003e\u003cstrong\u003eSubwoofer Pairing:\u003c\/strong\u003e The S1-1250 is an ideal match for SoundQubed’s \u003cstrong\u003eHDS2.2 Series subwoofers\u003c\/strong\u003e — run two wired to a 1Ω final load for a perfectly matched system. It also drives a single \u003cstrong\u003eHDS3.1 or HDS3.2\u003c\/strong\u003e with headroom to spare. Use the variable low-pass filter to set your crossover point between 50–80 Hz for most ported builds, and engage the subsonic filter to protect your drivers below their tuning frequency.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eElectrical Requirements:\u003c\/strong\u003e The S1-1250 is compatible with stock electrical systems for most builds. For maximum output at 16V, a high-output alternator and upgraded battery are recommended. Proper 4-gauge power and ground wiring is required for clean, reliable performance.\u003c\/p\u003e\n\n\u003ch2\u003eFull Specifications\u003c\/h2\u003e\n\u003cdiv style=\"overflow-x:auto;\"\u003e\n\u003ctable style=\"width:100%;border-collapse:collapse;font-size:14px;\"\u003e\n  \u003cthead\u003e\n    \u003ctr\u003e\n      \u003cth style=\"background-color:#222;color:#fff;padding:8px;text-align:left;\"\u003eSpecification\u003c\/th\u003e\n      \u003cth style=\"background-color:#222;color:#fff;padding:8px;text-align:left;\"\u003eS1-1250\u003c\/th\u003e\n    \u003c\/tr\u003e\n  \u003c\/thead\u003e\n  \u003ctbody\u003e\n    \u003ctr style=\"background-color:#f2f2f2;\"\u003e\n\u003ctd style=\"padding:8px;\"\u003eAmplifier Class\u003c\/td\u003e\n\u003ctd style=\"padding:8px;\"\u003eClass D\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd style=\"padding:8px;\"\u003eChannels\u003c\/td\u003e\n\u003ctd style=\"padding:8px;\"\u003e1\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr style=\"background-color:#f2f2f2;\"\u003e\n\u003ctd style=\"padding:8px;\"\u003eWorking Voltage\u003c\/td\u003e\n\u003ctd style=\"padding:8px;\"\u003e8.5V – 16V\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd style=\"padding:8px;\"\u003eRMS Power @ 4 Ohm (14.4V)\u003c\/td\u003e\n\u003ctd style=\"padding:8px;\"\u003e530W\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr style=\"background-color:#f2f2f2;\"\u003e\n\u003ctd style=\"padding:8px;\"\u003eRMS Power @ 2 Ohm (14.4V)\u003c\/td\u003e\n\u003ctd style=\"padding:8px;\"\u003e860W\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd style=\"padding:8px;\"\u003eRMS Power @ 1 Ohm (14.4V)\u003c\/td\u003e\n\u003ctd style=\"padding:8px;\"\u003e1,260W\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr style=\"background-color:#f2f2f2;\"\u003e\n\u003ctd style=\"padding:8px;\"\u003eFrequency Response\u003c\/td\u003e\n\u003ctd style=\"padding:8px;\"\u003e10 Hz – 200 Hz\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd style=\"padding:8px;\"\u003eSignal to Noise Ratio\u003c\/td\u003e\n\u003ctd style=\"padding:8px;\"\u003e\u0026gt;80 dB\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr style=\"background-color:#f2f2f2;\"\u003e\n\u003ctd style=\"padding:8px;\"\u003eDamping Factor\u003c\/td\u003e\n\u003ctd style=\"padding:8px;\"\u003e\u0026gt;100\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd style=\"padding:8px;\"\u003eInput Sensitivity\u003c\/td\u003e\n\u003ctd style=\"padding:8px;\"\u003e0.15V – 5V\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr style=\"background-color:#f2f2f2;\"\u003e\n\u003ctd style=\"padding:8px;\"\u003eSubsonic Filter\u003c\/td\u003e\n\u003ctd style=\"padding:8px;\"\u003e10 Hz – 50 Hz\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd style=\"padding:8px;\"\u003eLow-Pass Filter\u003c\/td\u003e\n\u003ctd style=\"padding:8px;\"\u003e20 Hz – 200 Hz\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr style=\"background-color:#f2f2f2;\"\u003e\n\u003ctd style=\"padding:8px;\"\u003ePower Terminal Size\u003c\/td\u003e\n\u003ctd style=\"padding:8px;\"\u003e4 Gauge (Set Screw)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd style=\"padding:8px;\"\u003eSpeaker Terminal Size\u003c\/td\u003e\n\u003ctd style=\"padding:8px;\"\u003e10 Gauge\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr style=\"background-color:#f2f2f2;\"\u003e\n\u003ctd style=\"padding:8px;\"\u003eClipping Indicator\u003c\/td\u003e\n\u003ctd style=\"padding:8px;\"\u003eYes (on Bass Knob)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd style=\"padding:8px;\"\u003eStrappable\u003c\/td\u003e\n\u003ctd style=\"padding:8px;\"\u003eYes\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr style=\"background-color:#f2f2f2;\"\u003e\n\u003ctd style=\"padding:8px;\"\u003eOverall Length\u003c\/td\u003e\n\u003ctd style=\"padding:8px;\"\u003e11.8\"\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd style=\"padding:8px;\"\u003eOverall Width\u003c\/td\u003e\n\u003ctd style=\"padding:8px;\"\u003e7.8\"\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr style=\"background-color:#f2f2f2;\"\u003e\n\u003ctd style=\"padding:8px;\"\u003eOverall Height\u003c\/td\u003e\n\u003ctd style=\"padding:8px;\"\u003e2.2\"\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ: What subwoofers pair best with the S1-1250?\u003c\/strong\u003e\u003cbr\u003e\nA: The S1-1250 is a perfect match for two \u003cstrong\u003eSoundQubed HDS2.2 Series subwoofers\u003c\/strong\u003e wired to 1Ω, or a single \u003cstrong\u003eHDS3.1 or HDS3.2\u003c\/strong\u003e with headroom to spare. It’s also a great entry-level amp for any subwoofer rated between 500–1,200W RMS.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ: Can I strap two S1-1250 amplifiers together?\u003c\/strong\u003e\u003cbr\u003e\nA: Yes — the S1-1250 is strappable, allowing you to link two units for significantly more output when your build demands it. This is a great upgrade path if you start with one amp and want to grow your system later.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ: What does the clipping indicator do?\u003c\/strong\u003e\u003cbr\u003e\nA: The clipping indicator on the bass knob lights up when the amplifier is being pushed into clipping (distortion). This lets you set your gain correctly and protect your subwoofers from distortion damage — an invaluable feature for daily driver builds.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ: Will the S1-1250 work with my stock electrical system?\u003c\/strong\u003e\u003cbr\u003e\nA: Yes — the S1-1250 operates from 8.5V to 16V and is compatible with most stock electrical systems for everyday listening. For maximum output near 1,500W at 16V, a high-output alternator and upgraded battery are recommended.\u003c\/p\u003e","brand":"SoundQubed","offers":[{"title":"Default Title","offer_id":49849764511972,"sku":null,"price":399.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0842\/2522\/9028\/files\/S1-1250-top__16549.webp?v=1789257319","url":"https:\/\/www.12voltoutlet.com\/products\/soundqubed-s1-1250-s-series-monoblock-amplifier","provider":"12 Volt Outlet","version":"1.0","type":"link"}