SoundQubed S1-850.1 S Series Monoblock Amplifier

SoundQubed S1-850.1 — 900W Mono Amplifier | S-Series | Class D | 1 Ohm Stable

The SoundQubed S1-850.1 is a compact, heavy-duty Class D monoblock amplifier delivering 900W RMS at 1 ohm (14.4V) — and pushing over 1,000W RMS at 16V — in a chassis that measures just 9.8" x 7.8" x 2.2". Part of SoundQubed’s S-Series lineup, the S1-850.1 is the ideal entry-level monoblock for daily drivers who need real bass from their car audio system without breaking the bank. Mount it just about anywhere — its deceptively small form factor fits under seats, in trunks, and in custom enclosure builds with ease.

The S1-850.1 features an on-board low-pass filter (20–200 Hz) for precise frequency control, a subsonic filter (10–50 Hz) to protect your drivers from extreme low-resonance distortion, and a clipping indicator on the included bass remote so you always know exactly where your gain is set. Input sensitivity runs from 0.15V to 5V for compatibility with virtually any head unit or DSP. Power connections use 4-gauge set screw terminals for clean current flow, and 10-gauge speaker terminals ensure consistent voltage delivery to your subwoofer. And when you’re ready to go bigger — the S1-850.1 is strappable, so you can link two units for even more output as your build grows.

Operating across a wide 8.5V–16V working voltage range with a maximum amperage draw of 90A, the S1-850.1 is compatible with stock and lightly upgraded electrical systems alike. It’s a reliable, efficient, and affordable monoblock that delivers exactly what it promises — every time.

Why Choose the SoundQubed S1-850.1?

• 900W RMS @ 1 Ohm (14.4V) / 1,000W+ @ 16V — Real, usable power for daily driver subwoofer builds — more than enough for most HDS2.2 and HDS3.1 applications.
• Class D Efficiency — High-efficiency design minimizes heat and maximizes power delivery to your subwoofers.
• Strappable — Link two S1-850.1 units for even more output when your build demands it — a natural upgrade path as you grow your system.
• Clipping Indicator on Bass Remote — Know exactly where your gain is set and avoid distortion — protects your subwoofers and your ears.
• Variable LPF (20–200 Hz) + Subsonic Filter (10–50 Hz) — Precise crossover and subsonic control for optimal tuning and driver protection.
• 4GA Power Terminals + 10GA Speaker Terminals — Clean current flow and consistent voltage delivery for reliable daily performance.
• 8.5V–16V Working Voltage Range — Compatible with stock and lightly upgraded electrical systems alike.
• Ultra-Compact 9.8" x 7.8" x 2.2" Chassis — One of the smallest 900W monoblocks available — fits virtually anywhere.

Amplifier & Subwoofer Recommendations

Subwoofer Pairing: The S1-850.1 is an ideal match for SoundQubed’s HDS2.2 Series subwoofers — run one or two wired to a 1Ω or 2Ω final load for a perfectly matched daily driver system. It also pairs well with a single HDS3.1 for a clean, punchy daily build. 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.

Electrical Requirements: The S1-850.1 is compatible with most stock electrical systems for everyday listening. Maximum amperage draw is 90A, so a standard 4-gauge wiring kit is all you need. For maximum output at 16V, a high-output alternator and upgraded battery are recommended.

Full Specifications

Frequently Asked Questions

Q: What subwoofers pair best with the S1-850.1?
A: The S1-850.1 is a perfect match for one or two SoundQubed HDS2.2 Series subwoofers, or a single HDS3.1 for a clean daily driver build. Any subwoofer rated between 400–900W RMS is a solid pairing.

Q: Can I strap two S1-850.1 amplifiers together?
A: Yes — the S1-850.1 is strappable, allowing you to link two units for significantly more output. This is a great upgrade path if you start with one amp and want to grow your system later without buying a completely new amplifier.

Q: What does the clipping indicator do?
A: The clipping indicator on the bass remote 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.

Q: Will the S1-850.1 work with my stock electrical system?
A: Yes — the S1-850.1 draws a maximum of 90A and operates from 8.5V to 16V, making it compatible with most stock electrical systems. A standard 4-gauge wiring kit is all you need for everyday listening at full output.