The Kicker KMA360.4 is a 4-channel marine amplifier rated 4 x 65W RMS at 4-Ohm or 4 x 90W RMS at 2-Ohm, built with Real Marine™ power connections that are ABYC and NMMA compliant — not just weather-resistant, but certified to the actual electrical standards marine inspectors check for. It's $239.96, and it's the smaller sibling to the KMA600.4 we've already reviewed.
If you read our KMA600.4 review and came away thinking “that's more amp than I need,” this is the one you were actually looking for. Same input flexibility, same tuning controls, meaningfully less power, and a lower price to match.
Key Takeaways
- Power output is 4 x 65W RMS at 4-Ohm or 4 x 90W RMS at 2-Ohm — a near-exact match for the 45KM654's 65W RMS rating, not just “enough.”
- Real Marine™ power connections are ABYC and NMMA compliant, a specific certification the KMA600.4's listing doesn't call out.
- It's a Class A/B design, not Class D like the KMA600.4 — a different amplifier topology, not just a smaller number on the spec sheet.
- Bridged, two channels deliver 180W RMS at 4-Ohm, which is enough headroom to properly drive a single 45KM84L (rated 150W RMS) even though the unbridged per-channel output can't.
- Kicker markets this one explicitly for both marine and powersports use, not marine only.
What Makes This One Different: Certified Connections
Every Kicker marine amp in this catalog claims weather resistance and conformal coating. The KMA360.4 adds something more specific: Real Marine™ power connections that are ABYC and NMMA compliant.
ABYC (American Boat and Yacht Council) and NMMA (National Marine Manufacturers Association) publish the electrical standards marine surveyors and boat builders actually check against — things like connection sealing, corrosion resistance, and wiring practices that keep a 12V system safe in a wet, vibrating, salt-air environment. A product calling out compliance with those standards by name is a more specific claim than “marine-rated,” and it's worth knowing this is where that language comes from rather than treating it as generic marketing copy.
KMA360.4 vs. KMA600.4: Side by Side
Since these two amps sit right next to each other in Kicker's lineup, here's the real comparison rather than making you cross-reference two separate spec sheets:
| Spec | KMA360.4 | KMA600.4 |
|---|---|---|
| Class | A/B | D |
| Power @ 4-Ohm (4-ch) | 4 x 65W RMS | 4 x 75W RMS |
| Power @ 2-Ohm (4-ch) | 4 x 90W RMS | 4 x 150W RMS |
| Bridged @ 4-Ohm | 2 x 180W RMS | 2 x 300W RMS |
| Dynamic power | 500W | 725W |
| Dimensions | 5″H x 9″W x 17″L | 4″H x 9″W x 16″L |
| Weight | 5.85 lbs | 6.7 lbs |
| Certifications called out | ABYC/NMMA-compliant connections | — |
| Price | $239.96 | $279.96 |
The pattern is straightforward: less power, a $40 lower price, a slightly larger but lighter chassis, and a specific compliance callout the pricier amp's listing doesn't have. Neither is objectively better — they're sized for different jobs.
Power Output, and Who It's Actually Enough For
At 65W RMS per channel into 4-Ohm, the KMA360.4 lines up almost exactly with the 45KM654's own 65W RMS rating — not “has enough headroom,” but a genuine one-to-one match. If your build is a pair (or two pairs) of 45KM654 speakers and nothing larger, this amp is sized correctly rather than oversized.
Where it gets more specific: the 45KM84L wants 150W RMS, which the KMA360.4 can't deliver per channel unbridged. But bridge two channels together and you get 180W RMS at 4-Ohm — enough to properly drive a single 45KM84L with real headroom. So a build running one 45KM654 pair on two unbridged channels and a single 45KM84L off the bridged remaining pair is actually within this amp's real capability, even though it looks underpowered for the 45KM84L at first glance.
If you're running two pairs of 45KM84L speakers and want each pair unbridged, that's the KMA600.4's job, not this one.
Same Inputs, Same Tuning — We Won't Repeat It Here
The KMA360.4 shares the same dual input design and onboard controls as the KMA600.4: both high-level (250mV–10V) and low-level (125mV–5V) input sensitivity, a variable 12dB crossover, and KickEQ variable bass boost up to 6dB. If you want the full explanation of why the dual-input design matters — specifically, that it means this amp works even if your head unit has no RCA preamp outputs — that's covered in detail in the KMA600.4 review rather than repeated here, since the mechanism is identical on both amps.
Built for Boats and Powersports Alike
One difference worth noting in how Kicker positions these two amps: the KMA360.4's listing names marine and powersports audio systems as its target application, while the KMA600.4 is framed as marine/watercraft specifically. For UTV, ATV, or golf cart builds running a 4-channel setup at more modest power needs, the KMA360.4 is the one built with that use case in mind from the spec sheet down. Our Powersports & Golf Cart Audio collection covers the rest of what that kind of build typically needs.
What You're Trading for the Lower Price
Less power per channel, unbridged. 65W RMS at 4-Ohm is real output, but it's meaningfully below the KMA600.4's 75W RMS, and well below its 150W RMS at 2-Ohm. If you're chasing volume over engine noise at speed with larger speakers, this isn't the amp for that build.
Class A/B instead of Class D. Class A/B designs typically run less efficiently than Class D at a given output level — more heat, more current draw for the same power delivered. That's part of why the KMA360.4 needs a slightly larger case (17″ vs. 16″ long) despite putting out less power.
Same 1-year warranty as the KMA600.4 — not a downgrade specific to this amp, but worth repeating: neither of Kicker's 4-channel marine amps in this catalog matches the 3-year warranty on the KM speaker lineup.
Still needs real mounting space. At 17 inches long, it's not meaningfully more compact than its bigger sibling — you're not saving physical space by choosing this one, only power and price.
Frequently Asked Questions
What's actually different between the KMA360.4 and the KMA600.4?
Primarily power output and amplifier class. The KMA360.4 is a Class A/B design rated 65W RMS per channel at 4-Ohm (90W at 2-Ohm); the KMA600.4 is Class D and rated 75W RMS at 4-Ohm (150W at 2-Ohm). The KMA360.4 also specifically calls out ABYC/NMMA-compliant connections and is marketed for powersports use as well as marine.
Is the KMA360.4 enough to power a 45KM84L speaker?
Not per channel unbridged — the 45KM84L wants 150W RMS, and this amp delivers 90W RMS per channel at 2-Ohm at most. Bridged, two channels deliver 180W RMS at 4-Ohm, which does properly cover a single 45KM84L.
Does the KMA360.4 need RCA preamp outputs on my head unit?
No. Like the KMA600.4, it accepts high-level (speaker-level) input directly, so it works with head units that have no RCA outputs.
What does ABYC/NMMA-compliant actually mean for me?
It means the amp's power connections meet published marine electrical safety and construction standards from the American Boat and Yacht Council and National Marine Manufacturers Association, rather than just being described as weather-resistant with no specific standard behind that claim.
Can I use the KMA360.4 on a UTV or golf cart instead of a boat?
Yes — Kicker markets this specific amp for both marine and powersports applications, unlike the KMA600.4, which is positioned as marine/watercraft only.
Bottom Line
The Kicker KMA360.4 is the right-sized amp if your build is a pair (or two) of 45KM654-class speakers, or a mixed build with one bridged 45KM84L, and you don't need the KMA600.4's higher power ceiling. The ABYC/NMMA-compliant connection claim is a genuinely specific detail most competing listings don't make, and the powersports-inclusive positioning makes it a reasonable pick for a UTV or golf cart build too, not just a boat.
It's not the right call if you're running larger speakers unbridged or chasing more output than 500W of dynamic power can deliver — that's what the KMA600.4 is for, at $40 more, or the 6-channel KMA600.6 if you need three full zones instead of one. But if you've already sized your speakers to the 45KM654 tier, paying for the bigger amp's extra headroom doesn't get you anything you'll use.