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Compact silver four-channel car amplifier with black heat-sink fins

PRV Audio

PRV Audio QS400.4 2 Ohm 4-Channel Class D Car Amplifier

SKU CH-6F4P-4SC40 MPN QS400.4

Four-channel Class D car amplifier delivering 100 W RMS per channel at 2 Ω, 70 W at 4 Ω or 200 W bridged in a compact 5.4" chassis

  • Amplifier channels4 Channels
  • Peak wattage400 W
  • Maximum power400 W
  • Product typeAmplifiers
  • Key featuresClass D
  • Four channels deliver 100 watts RMS each at 2 ohms
  • Class D topology runs cool and fits tight spaces
  • Bridged mode provides 200 watts RMS per pair at 4 ohms
  • Compact 5.4-inch chassis installs under seats or in dash
  • Stable at 2 ohms for flexible speaker wiring options

Compact four-channel amplifier

The PRV Audio QS400.4 is a 2 Ohm stable Class D car amplifier built for systems that need four independent channels in a tight space. It suits owners adding front and rear speakers or running a component set with dedicated amplification. The small 5.4 by 4 by 2 inch footprint allows mounting under seats or in shallow cavities.

Sustained output

Rated RMS power reaches 100 watts per channel at 2 Ohm and 70 watts per channel at 4 Ohm, giving consistent output during extended listening sessions. When bridged the unit delivers 200 watts per channel into a 4 Ohm load for a two-channel high-power configuration. Class D topology keeps heat low so performance remains steady without thermal throttling.

Installation practicalities

The compact chassis uses standard terminal blocks for speaker and power connections, making wiring straightforward with common gauge cable. Its reduced dimensions mean fewer clearance issues behind dash panels or in door cavities. The 2 Ohm stability lets builders wire multiple speakers per channel without dropping below the safe impedance threshold.

How it compares

Measured against everything we stock in Car Audio Amplifiers, at today’s prices. Recalculated every night.

Price $67.99
Cheaper than about 81% of the 158 comparable items (median $225.49).

Specifications

Product
Brand namePRV Audio
Model nameQS400.4 2 Ohms
Part numberQS400.4 2 Ohms
Product typeAmplifiers
Audio & video
Amplifier channels4 Channels
Power
Peak wattage400 W
Maximum power400 W

Questions about this item

How much heat does the Class D QS400.4 generate during all-day use?

Class D topology runs much cooler than older designs, so the compact chassis stays manageable even at the 4 x 100 W RMS level; normal cabin airflow is usually enough.

What wiring and speakers must I already have to install the QS400.4?

Plan for power and ground cables sized for 400 W peak, an inline fuse near the battery, RCA interconnects or speaker-level adapters, and four speakers or component sets rated for 2 Ω or 4 Ω loads.

Will the QS400.4 work with the factory head unit and speakers in my older car?

Yes — speaker-level inputs let you tap the existing radio, and the amp is stable at 2 Ω and 4 Ω, so it drives most OEM speakers; bridged mode delivers 2 x 200 W RMS at 4 Ω for a subwoofer upgrade.

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