The Kicker KXMA800.4 puts out 200W per channel at 2-ohm, or 100W per channel at 4-ohm, across 4 channels, at $569.99. Compare that to the already-covered KXMA500.4 (75W per channel at 4-ohm) or the KMA600.4 (also 75W per channel at 4-ohm), and the KXMA800.4 isn't a marginal step up, it's the most per-channel power of any 4-channel amp in Kicker's marine lineup.
That extra headroom is exactly what a set of higher-power tower speakers actually needs, and it's the one honest reason to pay more here than for either of the other two 4-channel options already covered.
Key Takeaways
- 200W per channel at 2-ohm, 100W per channel at 4-ohm, the highest 4-ohm per-channel rating of any 4-channel amp Kicker makes.
- That's 33% more 4-ohm power per channel than both the KXMA500.4 and KMA600.4, which tie at 75W each.
- Same FIT2 circuitry, DSP-controlled preamp, KickEQ 6dB bass boost, and gain-match LED as the rest of the KXMA line.
- 1100W dynamic power, with a 10Hz-20kHz frequency response.
- At 7.1 lbs and a 4"x11"x17" footprint, it's a similar physical size to the smaller KXMA500.4 despite the higher output.
Why Per-Channel Power Actually Matters Here
Channel count tells you how many speakers an amp can drive, it doesn't tell you how hard it can drive them. Both the KXMA500.4 and KMA600.4 are genuinely good 4-channel amps, but they cap out at 75W RMS per channel at 4-ohm, comfortable for standard coaxial speakers but well short of what a higher-power tower speaker is rated to handle. The KXMA800.4 closes that gap without changing the channel count or the physical footprint by much.
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Feature Walkthrough
Power Output
4x200W at 2-ohm, 4x100W at 4-ohm, with 1100W dynamic power and a 24dB variable crossover.
KXMA Electronics
FIT2 fail-safe circuitry, DSP-controlled preamp, KickEQ 6dB variable bass boost, and a gain-match LED indicator, the same package that distinguishes every KXMA amp from the standard KMA line.
Build
Black anodized aluminum chassis, top-mounted teal LED light pipe, and a gasket-sealed cover panel protecting the gain, crossover, and bass-boost controls.
Amplifier-to-Speaker Matching
At 100W per channel (4-ohm), this amp is the closer match for higher-power tower speakers like the 46KMFC8 (150W RMS recommended) than either the KXMA500.4 or KMA600.4, though it still leaves headroom unused against the flagship KMTC9/KMTC11 towers rated at 300W RMS. This is our own power-matching read, not an official Kicker-confirmed pairing.
Who It's For
Choose the KXMA800.4 if you're running 4 higher-power speakers and want real headroom per channel without moving to a 2-channel amp or bridging. If you're running standard coaxial speakers in the 65-100W RMS range, the cheaper KXMA500.4 or KMA600.4 already covers that comfortably, and the extra power here goes unused.
Honest Cons
$569.99 is a real premium over the KMA600.4's $279.96, for power that only matters if your speakers can actually use it.
Still short of the flagship KMTC9/KMTC11's 300W RMS ceiling. Reaching that specific number means bridging channels or a higher-output amp outside the 4-channel category entirely.
No numbered IP rating published, despite the ABYC/NMMA-compliant connections.
Frequently Asked Questions
How does this compare to the KXMA500.4?
Both are 4-channel KXMA amps with identical electronics, but the KXMA800.4 delivers 100W per channel at 4-ohm versus the KXMA500.4's 75W, a genuine power upgrade, not just a different price point.
Is this the most powerful 4-channel amp in the lineup?
By per-channel RMS output at 4-ohm, yes, it beats both the KXMA500.4 and KMA600.4, which tie at 75W per channel each.
Will this fully power the KMTC9 or KMTC11 towers?
Not at their full 300W RMS rating per channel. This amp gets you closer than the smaller KXMA/KMA 4-channel amps, but reaching that ceiling requires bridging or a higher-output amp.
Does it have the same bass boost as other KXMA amps?
Yes — the same KickEQ 6dB variable bass boost across the whole KXMA line.
Bottom Line
The KXMA800.4 is the amp to choose specifically when 75W per channel isn't enough and a 2-channel high-power amp is more than you need. Pay for it because your speakers can use the extra power, not because a bigger number sounds better on paper.