SoundQubed S1-1250 S Series Monoblock Amplifier
Key features
- Amplifier channels: 1
- RMS output at 4 ohms: 530.0 W
- RMS output at 2 ohms: 860 W
- RMS output at 1 ohm: 1260 W
SoundQubed S1-1250 S Series Monoblock Amplifier is backordered and will ship as soon as it is back in stock.
SoundQubed S1-1250 S Series Monoblock Amplifier is backordered and will ship as soon as it is back in stock.
Description
Description
Product Overview
The SoundQubed S1-1250 S Series monoblock amplifier gives your subwoofer system up to 1,260W RMS at 1 ohm and 14.4V. Its Class D design, adjustable filters, and compact chassis suit bass-focused builds where space and tuning control matter.
Use it with two SoundQubed HDS2.2 Series subwoofers wired to a 1-ohm final load, or with a single HDS3.1 or HDS3.2. At 16V, the amplifier is described as producing close to 1,500W.
Key Features & Benefits
- Class D design: Its high-efficiency design minimizes heat while delivering power to your subwoofers.
- Adjustable filters: Set the low-pass filter from 20–200 Hz and the subsonic filter from 10–50 Hz to tune the signal.
- Clipping indicator: The indicator on the bass knob helps you identify when the amplifier is clipping as you set gain.
- Strappable operation: Link two S1-1250 amplifiers when you want to expand your system.
- Compact chassis: The 11.8" x 7.8" x 2.2" dimensions give you specific measurements to check against your installation space.
- Broad input range: Input sensitivity of 0.15V–5V supports connection to a range of head units or DSPs.
Technical Specifications
| Specification | S1-1250 |
|---|---|
| Amplifier Class | Class D |
| Channels | 1 |
| Working Voltage | 8.5V – 16V |
| RMS Power @ 4 Ohm (14.4V) | 530W |
| RMS Power @ 2 Ohm (14.4V) | 860W |
| RMS Power @ 1 Ohm (14.4V) | 1,260W |
| Frequency Response | 10 Hz – 200 Hz |
| Signal to Noise Ratio | >80 dB |
| Damping Factor | >100 |
| Input Sensitivity | 0.15V – 5V |
| Subsonic Filter | 10 Hz – 50 Hz |
| Low-Pass Filter | 20 Hz – 200 Hz |
| Power Terminal Size | 4 Gauge (Set Screw) |
| Speaker Terminal Size | 10 Gauge |
| Clipping Indicator | Yes (on Bass Knob) |
| Strappable | Yes |
| Overall Length | 11.8" |
| Overall Width | 7.8" |
| Overall Height | 2.2" |
Why Choose This Product?
The S1-1250 combines multiple power ratings with adjustable crossover and subsonic controls, so you can select a setting for your subwoofer setup. Its clipping indicator provides a visual cue at the bass knob while you set gain.
The amplifier is strappable, offering an upgrade path if you later choose to link two units. Its stated working voltage range is 8.5V–16V, with close to 1,500W described at 16V.
Installation & Compatibility Notes
Use proper 4-gauge power and ground wiring. The amplifier has 4-gauge set-screw power terminals and 10-gauge speaker terminals.
For maximum output at 16V, a high-output alternator and upgraded battery are recommended. The source describes the amplifier as compatible with stock electrical systems for most everyday builds.
For most ported builds, the supplied guidance recommends setting the low-pass filter between 50–80 Hz and engaging the subsonic filter below the enclosure tuning frequency. Check your subwoofer’s final load and the amplifier’s installation space before purchase.
Frequently Asked Questions
How much power does the S1-1250 produce?
It delivers 1,260W RMS at 1 ohm and 14.4V. The product description also states close to 1,500W at 16V.
Which subwoofers are recommended for this amplifier?
Suggested pairings are two HDS2.2 Series subwoofers wired to a 1-ohm final load, or one HDS3.1 or HDS3.2. The description also identifies subwoofers rated between 500–1,200W RMS as a possible pairing range.
Can I connect two S1-1250 amplifiers?
Yes. The S1-1250 is strappable, so two units can be linked for more output.
What does the clipping indicator show?
The indicator on the bass knob lights when the amplifier is being pushed into clipping, helping you monitor gain adjustment.
Can it run on a stock electrical system?
The product description says it works with most stock electrical systems for everyday listening. A high-output alternator and upgraded battery are recommended for maximum output at 16V.
Explore More
Shop the SoundQubed S1-1250 at 12 Volt Outlet, and explore our SoundQubed brand profile.
