Ruthless Audio 800.4 4-Channel 800W RMS Full-Range Car Audio Amplifier
Sold by AudioSellerz.com
If you need a strong full-range amplifier for mids, highs, or a full speaker setup, the Ruthless Audio 800.4 is built for exactly that kind of system. This Korean-designed Class D 4-channel amplifier is made for daily drivers, front-stage upgrades, pro audio door builds, and demo setups that need real power, real tuning control, and clean output. Shop more Ruthless Audio amplifiers and subwoofers here:
https://audiosellerz.com/collections/ruthless-audio
The Ruthless 800.4 delivers the kind of flexibility that makes it useful in a wide range of builds. It is rated at 100 watts x4 at 4 ohms, 220 watts x4 at 2 ohms, and 440 watts x2 at 4 ohms bridged on 14.4V. That means the Ruthless Audio 800.4 amp is just as comfortable powering a full active front stage as it is running pro audio mids, coaxial speakers, or even a pair of small subs in the right setup.
One of the biggest reasons the Ruthless Audio 800.4 4-channel amplifier stands out is that it gives you both usable power and real crossover control. This is not just a basic 4-channel amp for stock replacement speakers. It is a serious option for people who want to build a louder, cleaner, more controlled system with the tuning flexibility to do it right.
The Ruthless 800.4 uses Tiffany-style RCA inputs for strong, noise-resistant signal transfer and 4-gauge power and ground inputs for dependable current flow. It also operates on 8V to 16V, which gives it the range needed for real-world car audio systems where voltage can vary depending on the build.
When it comes to tuning, the Ruthless Audio 800.4 has the controls needed to dial in a proper speaker system. It features input sensitivity from 6V to 0.2V, a high-pass filter from 20Hz to 800Hz with an x10 multiplier for 200Hz to 8kHz, and a low-pass filter from 50Hz to 800Hz with an x10 multiplier for 500Hz to 8kHz. That makes this amp a strong choice for mids and highs, full-range speakers, active front stages, and pro audio style door speaker builds where crossover flexibility matters.
It also includes a clip light function to help set gains correctly, which is a useful feature when you are trying to get the most out of your speakers without pushing the signal too far. For people building loud daily systems or more serious front-stage setups, that extra control is a big plus.
The Ruthless Audio 800.4 is designed with low distortion, with THD at 4 ohms greater than 0.01 listed in the provided specs, and a 100A fuse is recommended. Whether you are upgrading a daily driver, building a loud front stage, or powering pro audio speakers in the doors, this amp is built to give you strong, clean output with the flexibility to match a wide range of speaker setups.
If you are planning the rest of your system, wiring and install accessories matter too. Shop our Sky High Car Audio amp kits and wiring accessories here:
https://audiosellerz.com/collections/sky-high-car-audio-amp-kits
If you need help understanding speaker wiring and system planning for a 4-channel amplifier, read our car audio wiring diagram guide here:
https://audiosellerz.com/blogs/audio-sellerz-blogs/car-audio-wiring-diagram-guide
If the build is growing into a larger electrical upgrade, shop our Big 3 Kits here:
https://audiosellerz.com/collections/big-3-kits
If you need charging support for a stronger overall system, shop our Brand X Alternators here:
https://audiosellerz.com/collections/brand-x-electrical-alternators-batteries-high-output-charging-upgrades
You can also learn more about charging support for bigger systems in our high output alternator blog here:
https://audiosellerz.com/blogs/audio-sellerz-blogs/high-output-alternator-car-audio
RMS Power at 14.4V
100W x4 at 4 ohms
220W x4 at 2 ohms
440W x2 at 4 ohms bridged
Amplifier Type
Korean-designed Class D 4-channel full-range amplifier
Built for mids, highs, and full-range speaker systems
Signal and Power Connections
Tiffany-style RCA inputs
4-gauge power and ground inputs
Operational voltage: 8V to 16V
Controls and Audio Tuning
Input sensitivity: 6V to 0.2V
High-pass filter: 20Hz to 800Hz
x10 multiplier: 200Hz to 8kHz
Low-pass filter: 50Hz to 800Hz
x10 multiplier: 500Hz to 8kHz
Clip light function to help set gains correctly
Protection and Recommended Fuse
Low distortion design
THD at 4 ohms greater than 0.01
100A fuse recommended
If you want a Ruthless Audio 4-channel amp that can handle mids and highs, front-stage speakers, pro audio door setups, and full-range car audio systems with real tuning flexibility and solid power, the Ruthless Audio 800.4 is a strong fit.
