Kicker markets the PXA400.4 directly at "UTVs, off-road vehicles, hot rods, or space-challenged vehicles" — a 4-channel full-range amplifier at 100W per channel (2 or 4-ohm), dual IP66/IP67-rated, priced at $424.96 (down from $549.99).
As an authorized Kicker dealer, this is the amp we point to specifically when someone's real constraint is physical space, not just budget. Here's what a compact, dual-rated 4-channel amp actually gets you.
Key Takeaways
- 100W per channel at both 2-ohm and 4-ohm — unlike most amps in this catalog, power doesn't drop between those two impedances.
- Bridgeable to 2x200W mono at 4-ohm if you want two higher-power channels instead of four standard ones.
- IP66 and IP67 dual-certified, the same waterproof rating tier as the PXA1000.5, genuinely stronger documentation than the marine KMA/KXMA lines.
- Solder-free inline power and ground couplers, plus a choice of DC offset or 12V trigger turn-on.
- At 3"H x 9"W x 14"L and 4.2 lbs, it's a notably compact footprint for a full 4-channel amp.
Power That Doesn't Drop Between 2-Ohm and 4-Ohm
Most stereo and multi-channel amps in this catalog deliver more power at 2-ohm than at 4-ohm. The PXA400.4 delivers the identical 100W per channel at both impedances, which simplifies planning if you're not certain what final impedance your speaker wiring will land on. That flat curve doesn't extend to the bridged mono mode, which delivers 200W per channel at 4-ohm when you combine two channels into one higher-power output.
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Feature Walkthrough
Compact Footprint
At 3 inches tall, this is built to fit under a seat, behind a dash panel, or in other genuinely tight spaces where a standard-size 4-channel amp wouldn't clear.
Dual IP66/IP67 Rating
The same waterproof certification as the PXA1000.5: protection from dust and water jets/splash (IP66), plus temporary submersion resistance (IP67).
Bridging Flexibility
Bridge to 2x200W mono at 4-ohm if your build calls for two higher-power channels (front speakers, for instance) rather than four standard-power ones.
Install Simplicity
Solder-free inline power and ground couplers, plus a choice between DC offset or 12V trigger turn-on modes depending on your head unit.
Amplifier Pairing
At 100W per channel, this comfortably drives most of the coaxial speakers we've reviewed across this catalog, including the 45KM654 and similar mid-power options. This is our own power-matching read, not an official Kicker-confirmed pairing.
Who It's For
Choose the PXA400.4 if your install genuinely has limited mounting space, on a UTV, hot rod, or similar build, and you want a documented waterproof rating rather than general weather-resistant language. It's not the right amp if you need a dedicated subwoofer channel too — the PXA1000.5 covers that combined use case in one box instead.
Honest Cons
No dedicated subwoofer channel. This is full-range only; pair it with a separate mono sub amp if bass is part of your build.
$424.96 is a mid-range price for a 4-channel amp — the marine KMA360.4 costs less, though without the same numbered IP rating.
Bridged mode sacrifices channel count. Bridging to 2x200W mono means giving up two of the four available channels.
Frequently Asked Questions
Will this actually fit in a tight UTV dash?
At 3 inches tall and 4.2 lbs, it's built specifically for that kind of constrained mounting space, more compact than a typical full-size 4-channel amp.
Is the IP67 rating actually tested, or just marketing language?
IP ratings are a standardized testing scale; a stated IP67 certification means the product passed that specific submersion test, a stronger claim than general "weather-resistant" wording.
Can I run a subwoofer off one of the four channels?
You can bridge two channels for higher power to a subwoofer, but there's no dedicated sub-tuned channel with its own crossover the way the PXA1000.5 provides.
Does power really stay the same at 2-ohm and 4-ohm?
Yes, per Kicker's published specs, both are rated at 100W per channel — unusual compared to most amps in this catalog, which typically deliver more at 2-ohm.
Bottom Line
The PXA400.4 is built for exactly the scenario its marketing states: vehicles where amp mounting space is the real constraint, backed by a genuine dual waterproof rating. Skip it if you need a subwoofer channel in the same box — the PXA1000.5 covers that instead.