32% under what the other stores charge
Compared across 14 stores. Prices are checked against each store and labelled with when. Store links may earn us a commission. As an Amazon Associate, Deal.ai earns from qualifying purchases.
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The QS400.4 is a compact 4-channel Class D car amplifier rated at 100 watts RMS per channel at 2 ohms, with a regulated power supply and 80–90% efficiency. It is stable at 2 ohms and can be bridged to two channels at 200 watts RMS each. Its small aluminum heatsink allows flexible installation. It suits drivers who need full-range power for multiple speakers without upgrading their electrical system. Compared to larger Class AB amps, it runs cooler and draws less current, but some users note that its power ratings are at 14.0 volts and that it lacks premium features like DSP or high-level inputs.
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Lowest price we've seen: $54.00 on Nov 13 at Amazon. Tracked across 14 stores since Nov 13.
The QS400.4 is a 4-channel, full-range Class D car audio amplifier from PRV Audio. It is stable at 2 ohms, so you can wire multiple speakers and divide the power across the channels. It delivers 4 x 100 watts RMS at 2 ohms.
It has a regulated power supply in a small aluminum heatsink. The compact chassis measures 4 inches wide, 5.40 inches long and 2 inches high, so it can be installed almost anywhere in a vehicle. Two channels can be bridged for 2 x 200 watts RMS, with a minimum load of 4 ohms per bridged channel.
Switch the amplifier off before adding or removing connections. Keep cables away from ignition cables, electronic injection modules and the starter switch to avoid noise interference. Use 100% copper wire and good quality connectors, and keep cables clear of sharp metal edges. Install a 25A fuse 12 inches from the battery. The amplifier is designed for music use with speakers, and resistive load testing is not recommended.
