Ruthless Audio 1500.4 4 Channel Amplifier

Product Overview

Give demanding speakers the output and tuning flexibility to shape a powerful full-range system with the Ruthless Audio 1500.4 4-channel amplifier. Its Class-D design delivers up to 450W x 4 at 2 ohms, or 900W x 2 when bridged at 4 ohms.

Use all four channels for a high-output speaker setup, or bridge channels in pairs for a two-channel configuration. The onboard crossovers and clip light help you tune and monitor the system at the amplifier.

Key Features & Benefits

• High channel output: 450W x 4 at 2 ohms supports high-power speakers and drivers.
• Bridgeable design: 900W x 2 at 4 ohms lets you configure the amp for two-channel use.
• Adjustable crossovers: Wide high-pass and low-pass ranges give you control over speaker and subwoofer integration.
• Clip light: A visual clipping indicator helps you set gain and monitor the signal.
• Locking RCA inputs: Tiffany-style connectors provide a locking connection for your RCA signal cables.
• 1/0 AWG power input: Full-size power terminals match the amplifier’s stated high-current wiring requirements.

Technical Specifications

Why Choose This Product?

The 1500.4 is the higher-output option compared with the Ruthless Audio 800.4: the supplied product information lists 450W x 4 versus 220W x 4 at 2 ohms. That additional output may suit a system built around high-power component speakers, pro-audio drivers, or coaxial speakers.

Its input sensitivity spans 0.2V–6V, while the onboard high-pass and low-pass filters offer adjustment without relying solely on an external processor. The stated total harmonic distortion is less than 0.01% at 4 ohms.

Installation & Compatibility Notes

The product information recommends speakers or pro-audio drivers rated in the 200–450W RMS range per channel. It calls for a 1/0-gauge power and ground wiring kit with a 200-amp inline fuse. Keep power and ground runs as short as practical, and route RCA cables away from power wiring to help avoid noise.

For bridged operation, connect channels 1+2 and/or 3+4 as needed. Confirm each bridged speaker or subwoofer is rated for a minimum 4-ohm bridged load and can handle the amplifier’s output. Use the clip light while setting gain; reduce gain if the light illuminates during typical listening. A DSP can be used upstream for time alignment, EQ, and crossover duties.

Frequently Asked Questions

What power does the Ruthless Audio 1500.4 provide?

It is rated at 250W x 4 RMS at 4 ohms and 450W x 4 RMS at 2 ohms, both at 14.4V. Bridged power is 900W x 2 at 4 ohms and 14.4V.

Can I bridge the amplifier for a subwoofer?

Yes. The amplifier can be bridged in channel pairs, with a 4-ohm minimum bridged load. Confirm the subwoofer can handle the output before connecting it.

What wiring does the 1500.4 require?

The supplied installation guidance calls for 1/0-gauge power and ground wiring with a 200-amp inline fuse.

How do I use the clip light when setting gain?

At your typical maximum listening volume, increase gain until the light illuminates, then reduce gain until it turns off. A DMM or oscilloscope can be used alongside the indicator for more precise setup.

How does it compare with the Ruthless Audio 800.4?

The product information lists 450W x 4 at 2 ohms for the 1500.4 and 220W x 4 at 2 ohms for the 800.4. It also specifies 1/0-gauge power inputs and a 200-amp fuse for the 1500.4.

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