Kicker 48KMA3604 KMA360.4 4x90w 4-Ch Weather-Resistant Full-Range Amplifier
Quick take
The Kicker KMA360.4 is a 4-channel marine amplifier built for boat audio systems where space is limited and weather resistance matters. With conformal-coated circuit boards, 316L stainless hardware, and built-in variable crossovers, it’s aimed at buyers who want clearer, stronger full-range sound without adding external processing. The main caveat is fit: it’s a 4-channel full-range design, so it is not the right choice if you need dedicated subwoofer amplification or a multi-zone configuration beyond what your wiring supports.
Pros and cons
Pros
- Marine-focused build, including conformal-coated circuit boards and 316L stainless-steel hardware
- 4-channel full-range power with built-in variable crossovers for speaker matching
- Compact footprint that can be easier to mount out of the way
- Buyers commonly report clean, clear sound and strong output at higher volumes
Cons
- Best for full-range speaker setups, not for sub-specific amplification needs
- Some buyers note install documentation could be stronger, so plan extra time for wiring
What buyers think
Buyer-review evidence is limited but consistent in a few decision-relevant areas. Reviews describe the sound as clean and clear, with noticeable improvements in clarity and overall performance after installation. Several buyers also call out the compact size as helpful for finding a mounting location on a boat. On usability, installation is described as generally straightforward, though one review suggests the documentation could be better. Overall, the recurring themes point to strong perceived audio quality, enough power for real-world boat noise, and solid marine build quality.
What it is and who it’s for
The Kicker KMA360.4 is a weather-resistant, 4-channel amplifier meant for marine full-range audio systems. “Full-range” here matters because the amp is intended to drive speakers that reproduce a broad frequency range (as opposed to dedicated subwoofers). The built-in variable crossovers are designed to help you tune which speakers play which frequencies, supporting more precise matching between your speakers and your desired sound profile.
Key features that affect your buying decision
Marine build details
- Conformal-coated circuit boards: helps repel moisture on the electronics.
- 316L stainless-steel no-rust hardware: targets corrosion resistance in harsh marine conditions.
- Weather-resistant approach: the overall design is aimed at boats where humidity and spray are daily realities.
Power and channel layout
This is a 4-channel amplifier (4 full-range channels). That makes it a strong match for boats that already have four full-range speakers (or need four channels to run a front/rear or left/right setup). The amplifier is rated with power output that varies by load and operating mode, including 4-ohm stereo and 2-ohm stereo scenarios, and it supports bridged configurations (useful when your speaker wiring calls for it).
Built-in crossover tuning
Instead of requiring external crossovers, it includes built-in variable crossovers to help shape the sound and tune speaker performance matching. The practical payoff is more control over how your speakers handle frequencies, which can help reduce harshness or fill out the sound stage depending on your installation and speaker capabilities.
Mounting and footprint
With a relatively small form factor, it’s designed to fit into typical boat amplifier mounting locations. A compact size can simplify planning, especially when you are working around existing wiring routes, cabinetry, or deck equipment.
Important specs to sanity-check for your setup
- Frequency response: listed as 10-20kHz (+0/-1 dB) for the high end.
- Input sensitivity: supports high (250mV to 10V) and low (125mV to 5V) input ranges, which can help with compatibility across different head units and signal types.
- Signal-to-noise ratio: listed at >95 dB (A-weighted).
- Power mode flexibility: ratings are provided for multiple load and stereo/mono/bridged arrangements, so confirm how you plan to wire your speakers before you buy.
Pros and cons for real boat audio builds
Pros you can feel after install
- Clearer sound is a common takeaway: buyers report improved clarity and stronger overall performance.
- Marine construction reduces worry: moisture-repelling and corrosion-resistant choices are aligned with boat conditions.
- Less clutter: the compact footprint can make installation easier than larger amps.
Tradeoffs to consider
- Not a sub amplifier solution: if you want dedicated subwoofer control, you may need a different amplifier type or additional processing and channel planning.
- Documentation may not be perfect: while installation is generally described as straightforward, plan for potential time spent double-checking wiring and configuration.
Verdict: is the Kicker KMA360.4 worth it?
The Kicker KMA360.4 is a solid choice if you want a compact, weather-resistant 4-channel marine amplifier for full-range speaker systems and you value built-in crossover tuning. Reviews point to clean, clear audio and strong perceived power for outdoor boat conditions. It’s likely the wrong fit if your priority is dedicated sub amplification, or if your setup requires a different channel configuration than a straightforward 4-channel full-range build.
FAQ
How many channels is the Kicker KMA360.4?
It’s a 4-channel amplifier designed for full-range audio (4 channels).
Is this amplifier meant for subwoofers?
It’s built for full-range speaker setups. If you need dedicated subwoofer amplification, you will likely want a different amp or a different channel plan that matches subwoofer requirements.
What makes it more suitable for marine use?
Key marine-focused design elements include conformal-coated circuit boards to repel moisture and 316L stainless-steel no-rust hardware.
Does it include crossovers?
Yes. It includes built-in variable crossovers to help tune speaker performance matching.
Is it hard to install?
Many buyers describe installation as straightforward, but review evidence also suggests install documentation could be better, so it helps to plan time for wiring and configuration.
What should I confirm before buying?
Confirm your speaker count and whether you need full-range or sub-specific amplification, then check how your speaker wiring and impedance match the amplifier’s rated power modes.
Specifications
| Product Title | Kicker 48KMA3604 KMA360.4 4x90w 4-Ch Weather-Resistant Full-Range Amplifier |
|---|---|
| Category | Electronics > Car & Vehicle Electronics > Marine Electronics > Marine Amplifiers |
| Manufacturer | Kicker |
| Item Weight | 5.94 pounds |
| Product Dimensions | 16.8 x 9 x 4.3 inches |
| Item model number | 48KMA3604 |
| Is Discontinued By Manufacturer | No |
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