Ruthless Audio 1500.4 4 Channel Amplifier
Building a high-output speaker stage? The Ruthless Audio 1500.4 4-Channel Amplifier offers four channels rated at 450W each into 2 ohms at 14.4V, with the option to bridge channel pairs for 900W x 2 into 4 ohms. It is a candidate for demanding component, coaxial, or pro-audio speaker setups when the drivers and electrical system are matched to its output.
Compared with the 800.4's listed 220W x 4 at 2Ω, the 1500.4 steps up to 1/0 AWG power inputs and a listed 200A fuse rating. Tiffany-style locking RCA inputs help secure the signal cables, and the onboard clip light provides a visual warning when the signal clips. Input sensitivity is 0.2V–6V and the stated operating voltage is 8–16V. Published THD is less than 0.01% at 4Ω; that figure applies at the stated load, not every output level.
Built-in filters give you useful tuning options: the high-pass control spans 20Hz–800Hz or 200Hz–8kHz with x10; the low-pass control spans 50Hz–800Hz or 500Hz–8kHz with x10. You can run four channels to speakers or bridge pairs for a compatible two-channel arrangement. Check your drivers' power handling and the final load before choosing how to connect them.
Why Choose the Ruthless Audio 1500.4 4-Channel Amplifier?
- 450W x 4 @ 2 Ohms — Published four-channel output at 14.4V for properly matched drivers.
- 900W x 2 Bridged @ 4 Ohms — Two bridged channel pairs offer an alternative high-power configuration.
- 1/0 AWG Power Inputs — Large power terminals to accommodate the specified wiring for a high-current build.
- 200A Fuse Rating — A listed specification to consider when sizing power runs and protection.
- Tiffany-Style Locking RCA Inputs — Locking connections help keep RCA cables seated.
- Clip Light Function — A useful clipping indicator during setup, alongside proper gain-setting methods.
- Wide Filter Adjustment with x10 — HPF at 20Hz–800Hz or 200Hz–8kHz; LPF at 50Hz–800Hz or 500Hz–8kHz.
- THD < 0.01% @ 4Ω — Published distortion figure at the stated load.
Amplifier & Wiring Recommendations
Consider drivers with suitable impedance and RMS handling for the 1500.4's published 250W x 4 at 4Ω or 450W x 4 at 2Ω output. Supply an appropriate four-channel RCA signal from your head unit or DSP. The original listing specifies 1/0 AWG power and ground wiring with 200A fusing; confirm cable length, material, ground path, fuse placement, and the manufacturer's installation instructions before selecting a kit. Route signal and power cables separately where practical to help control noise.
When bridging, keep each bridged load at a minimum of 4Ω and verify the speaker or subwoofer can handle the stated 900W output. Treat the clip light as an indicator, not proof that every source or song is free of distortion once it goes out. Follow a suitable gain-setting process with test equipment where possible. A DSP can add time alignment and EQ if the system calls for more control.
Full Specifications
| Specification | Value |
|---|---|
| RMS Power @ 4Ω (14.4V) | 250W x 4 |
| RMS Power @ 2Ω (14.4V) | 450W x 4 |
| Bridged Power @ 4Ω (14.4V) | 900W x 2 |
| Amplifier Class | Class-D |
| Channels | 4 (Bridgeable to 2) |
| High Pass Filter | 20Hz–800Hz / 200Hz–8kHz (x10) |
| Low Pass Filter | 50Hz–800Hz / 500Hz–8kHz (x10) |
| THD | < 0.01% @ 4Ω |
| Input Sensitivity | 0.2V – 6V |
| RCA Inputs | Tiffany-Style Locking RCA |
| Power Input Gauge | 1/0 AWG |
| Clip Light | Yes |
| Operating Voltage | 8–16V |
| Fuse Rating | 200A |
| Warranty | 1 Year Standard / 2 Year Extended Available |
Note: Physical dimensions are not included in this listing. Contact us for a full spec sheet before planning a space-limited installation.
Frequently Asked Questions
Q: What is the difference between the Ruthless Audio 1500.4 and the 800.4?
A: At 2Ω and 14.4V, the listed outputs are 450W x 4 for the 1500.4 and 220W x 4 for the 800.4. The 1500.4 also lists 1/0 AWG inputs and a 200A fuse rating. Choose based on speaker needs and your electrical plan, not wattage alone.
Q: What wiring kit do I need for the Ruthless Audio 1500.4?
A: This listing specifies 1/0 AWG power and ground cable and 200A fusing. Confirm the manufacturer's requirements and size protection for the actual wire and installation; don't substitute smaller cable without proper engineering.
Q: Can I bridge the 1500.4 to run a subwoofer?
A: Yes. A bridged pair is listed at 900W into 4Ω at 14.4V. You may use the remaining channels for suitable speakers if the system is configured appropriately; maintain the minimum bridged load.
Q: How do I use the clip light to set my gain?
A: Use the light as a warning while following a proper gain-setting procedure. A suitable test signal and DMM or oscilloscope can provide more controlled setup than relying on a music track and the light alone.
