Ruthless Audio 800.4 4 Channel Amplifier

The Ruthless Audio 800.4 4-Channel Amplifier is the full-size powerhouse in the Ruthless Audio 4-channel lineup — built on premium Korean Class-D technology and engineered to deliver clean, high-output power across all four channels with the flexibility to adapt to virtually any system configuration. Whether you're running a full front and rear speaker stage, bridging into a 2-channel setup for component midranges, or pushing a compact subwoofer alongside your door speakers, the 800.4 has the output and the versatility to handle it all.

The 800.4 puts down 220W x 4 @ 2 ohms, 100W x 4 @ 4 ohms, and a powerful 440W x 2 bridged @ 4 ohms at 14.4V — real, usable power across every configuration. Premium Tiffany-style locking RCA inputs lock in your signal connection and eliminate intermittent contact issues, while 4-gauge power inputs ensure low-resistance current delivery. The onboard clip light function gives you a real-time visual indicator of signal clipping, making it easy to dial in your gain structure without a scope and protect your speakers from distortion damage. Input sensitivity spans 0.2V–6V for compatibility with any head unit or DSP output, and the wide 8–16V operating voltage range handles everything from stock to upgraded electrical systems. THD of less than 0.01% at 4 ohms confirms the 800.4 stays clean even at high output levels.

The 800.4's onboard crossover section offers serious flexibility: the high-pass filter sweeps from 20Hz–800Hz (with a x10 multiplier extending to 200Hz–8kHz), and the low-pass filter sweeps from 50Hz–800Hz (x10 to 500Hz–8kHz) — giving you precise crossover control for both full-range speaker and subwoofer integration without external processors. A 100-amp fuse is recommended to properly support the amp's current demands under sustained high-output operation.

Why Choose the Ruthless Audio 800.4 4-Channel Amplifier?

• 220W x 4 @ 2 Ohms — High-output 4-channel power that drives demanding component speakers and pro-audio drivers with authority and headroom to spare.
• 440W x 2 Bridged @ 4 Ohms — Bridge channels in pairs for a powerful 2-channel configuration — ideal for driving component midranges or a compact subwoofer alongside your door speakers.
• Korean Class-D Technology — Premium-grade Class-D circuitry delivers high-efficiency power with razor-sharp clarity and minimal heat generation under sustained load.
• Tiffany-Style Locking RCA Inputs — Premium locking connectors eliminate signal loss and intermittent contact for a clean, reliable signal path at any power level.
• 4-Gauge Power Inputs — Full-size 4-gauge terminals minimize resistance and support clean, stable current delivery to the amplifier.
• Clip Light Function — Real-time visual clipping indicator lets you dial in your gain structure accurately and protect your speakers from distortion damage without needing an oscilloscope.
• Wide Crossover Range with x10 Multiplier — HPF (20Hz–8kHz) and LPF (50Hz–8kHz) with x10 multiplier give you surgical crossover control for both speaker and subwoofer integration.
• THD < 0.01% @ 4Ω — Exceptionally low total harmonic distortion confirms clean, accurate power delivery even at high output levels.

Amplifier & Wiring Recommendations

The Ruthless Audio 800.4 is an ideal match for component speakers or coaxial drivers rated in the 100–220W RMS range per channel. Pair it with a quality 4-channel RCA signal from your head unit or DSP processor for best results. A 4-gauge power and ground wiring kit is the minimum recommendation, with a 100-amp fuse inline on the power run as specified by Ruthless Audio. Keep power and ground runs as short as possible, and route RCA cables away from power wiring to eliminate noise.

When bridging the 800.4 to 2 channels, verify your speakers or subwoofer can handle the increased output and are rated for a minimum 4-ohm bridged load. Use the onboard clip light to set your gain — back off the gain until the clip light extinguishes at your typical listening volume, then fine-tune from there. For maximum tuning precision, pair the 800.4 with a DSP processor upstream to handle time alignment, EQ, and crossover duties before the signal reaches the amp.

Full Specifications

Note: Physical dimensions not provided by manufacturer. Contact us for full spec sheet.

Frequently Asked Questions

Q: What is the difference between the Ruthless Audio 800.4 and the 800.4 Micro?
A: The 800.4 is the full-size version featuring Korean Class-D technology, Tiffany RCA inputs, 4-gauge power terminals, and a clip light function. The 800.4 Micro is an ultra-compact version optimized for space-limited installs like motorcycles and powersports. The full-size 800.4 offers more crossover flexibility and the clip light for easier gain setup.

Q: What wiring kit do I need for the Ruthless Audio 800.4?
A: A 4-gauge power and ground wiring kit is recommended, with a 100-amp inline fuse on the power run as specified by Ruthless Audio.

Q: Can I bridge the 800.4 to run a subwoofer?
A: Yes — bridge channels 3+4 for 440W @ 4 ohms to power a compact subwoofer, while channels 1+2 continue to drive your front speakers in stereo. Ensure your subwoofer is rated for a minimum 4-ohm bridged load.

Q: How do I use the clip light to set my gain?
A: Play music at your typical maximum listening volume, then slowly increase the gain until the clip light illuminates. Back the gain off slightly until the light extinguishes — that's your optimal gain setting. For more precision, use a DMM or oscilloscope alongside the clip light.