KICKER 48KMA6004 600 Watt 4-Channel Marine Amplifier (KMA600.4)
Quick take
The KICKER 48KMA6004 is a 4-channel marine Class D amplifier designed to deliver strong power to a multi-speaker boat audio setup while staying tunable. It offers an adjustable 12 dB crossover plus KickEQ bass boost for shaping output, but it does not include a wired remote, which may matter if you expect one for day-to-day control.
Pros and cons
Pros
- Four-channel design with bridging capability for expanded wiring options.
- Onboard tuning features: variable 12 dB crossover and KickEQ bass boost (0 to 6 dB, centered around 40 Hz).
- Marine-focused build details, including conformal-coated circuit board and ABYC/NMMA-compliant power connections.
- Good signal clarity on paper, with a specified signal-to-noise ratio over 95 dB (A-weighted).
Cons
- No wired remote is included, so plan your control method accordingly.
- Buyer-review evidence is mixed, including at least one report of disappointing low output, which may point to setup and compatibility variables.
- It is designed for marine installs, but if you want extra channel flexibility beyond four channels, you may need a different model.
What buyers think
Buyer-review evidence for this amplifier is limited overall, but the feedback that is available tends to cluster around two themes: sound quality and fit for real installations. Positive comments mention that it sounds great and works as expected once installed. There is also at least one more critical review citing low power and disappointment, though the evidence is not detailed enough to confirm whether the issue is typical versus caused by installation, configuration, or system matching. Overall, the pattern suggests that when the amp is set up correctly for the boat audio system, buyers are more likely to be satisfied with performance.
Key features that matter for a marine 4-channel setup
Class D power with tunable output for multiple speakers
This amplifier is built as a four-channel unit and is rated for different power scenarios depending on how you wire your speakers. It is specified for 2-ohm stereo (150 watts per channel, x4) and 4-ohm bridged mono (300 watts per channel, x2), with dynamic power listed at 725 watts. In practice, that means you can use it to drive a typical multi-speaker layout, and you can also bridge when your speaker wiring calls for it.
Adjustable crossover and KickEQ bass boost
To help you dial in sound on a boat, the amp includes an active crossover with a variable 12 dB/octave slope (variable 50 to 200 Hz). It also lets you choose between high-pass, low-pass, or all-pass behavior, depending on your speaker roles (for example, separating mids from sub frequencies). For bass shaping, KickEQ provides a variable 0 to 6 dB boost centered at 40 Hz. If your boat setup needs extra low-end presence without reworking the entire signal chain, this built-in tuning can be a practical advantage.
Marine-ready design details
It is designed for marine durability, with a conformal-coated circuit board and 316L stainless-steel hardware included. It also uses power connections identified as ABYC/NMMA-compliant, which can reduce compatibility surprises for buyers who want marine-appropriate components in the install.
Connectivity and installation considerations
Input sensitivity supports high-level and low-level sources
The amplifier is specified with high-level input sensitivity from 250 mV to 10 V and low-level input sensitivity from 125 mV to 5 V. This flexibility can make it easier to integrate with different head units or signal options, especially in mixed boat audio systems.
Remote control expectations
The amplifier includes a wired remote is not included. If you plan on using a specific remote-controlled workflow, or you are replacing an amp that relied on a remote, confirm your control approach before buying.
Specifications snapshot (the parts you should verify for your build)
- Channels: 4
- Rated output: 600 watts (with scenario-specific ratings, including 2-ohm stereo and 4-ohm bridged mono)
- Dynamic power: 725 watts
- Frequency response: 10 Hz to 20 kHz, +0/-1 dB
- Signal-to-noise ratio: greater than 95 dB (A-weighted)
- Active crossover: variable 12 dB/octave, 50 to 200 Hz; selectable high-pass, low-pass, or all-pass
- KickEQ bass boost: variable 0 to 6 dB, centered at 40 Hz
- Power connections: ABYC/NMMA-compliant
- Supply voltage range: 10 V minimum to 14.4 V maximum (DC)
Pros and cons, in plain English
- You’ll probably like it if: you want a marine-ready four-channel amplifier with built-in crossover and bass tuning, and you have a speaker layout that matches four channels (with the option to bridge when needed).
- You might want to pass if: your setup requires a wired remote included in the box, or you need more than four channels for your current speaker plan.
- Power disappointment can happen with any amp: if the gain structure, input type (high-level versus low-level), and speaker impedance wiring are not aligned. The available critical feedback is not specific enough to confirm a product-level issue, but it is a reminder to plan your install carefully.
Verdict
The KICKER 48KMA6004 is a solid choice for boat owners who want a tunable four-channel marine amplifier with crossover control and KickEQ bass boost, plus marine-oriented build features meant for harsh environments. If your system design fits a four-channel amp and you are comfortable handling install details (especially around signal integration and remote expectations), it is a reasonably feature-rich option. Just make sure your wiring and gain settings match your speakers so you get the performance you are paying for.
FAQ
Does the KICKER 48KMA6004 include a wired remote?
No. A wired remote is not included, so you will want to plan for how you will control any remote functions if your setup requires them.
What tuning options does this amplifier provide?
It includes a variable 12 dB/octave active crossover with selectable high-pass, low-pass, or all-pass modes (variable 50 to 200 Hz), and KickEQ bass boost that can be adjusted from 0 to 6 dB centered at 40 Hz.
How much power is it rated for?
It is specified as a 600-watt amplifier, with additional scenario-specific ratings (including 150 watts per channel at 2 ohms stereo and 300 watts per channel in bridged mono at 4 ohms), plus dynamic power listed at 725 watts.
Is it suitable for marine installs?
Yes. It is built for marine use with a conformal-coated circuit board, 316L stainless-steel hardware included, and power connections identified as ABYC/NMMA-compliant.
Will it work with both high-level and low-level inputs?
Yes. It supports high-level input sensitivity from 250 mV to 10 V and low-level input sensitivity from 125 mV to 5 V, giving you flexibility depending on your head unit and signal method.
Specifications
| Product Title | KICKER 48KMA6004 600 Watt 4-Channel Marine Amplifier Boat Amp KMA600.4 |
|---|---|
| Category | Electronics > Car & Vehicle Electronics > Marine Electronics > Marine Amplifiers |
| Manufacturer | Kicker |
| Voltage | 5 Volts |
| Maximum Supply Voltage | 14.4 Volts (DC) |
| Minimum Supply Voltage | 10 Volts |
| Mounting Type | Surface Mount |
| Number of Channels | 4 |
| Output Power | 600 Watts |
| Package Type Name | cardboard box |
| Maximum Output Power | 600 watts |
| Item Dimensions | 3 x 3 x 3 inches |
| Material Type | Stainless Steel |
| Model | 48KMA6004 |
| Brand Name | KICKER |
| Warranty Description | 1 Year Manufacturer |
| Part Number | 48KMA6004 |
| Unit Count | 1.0 Count |
| Specification Met | Abyc/Nmma-compliant |
| Item dimensions L x W x H | 3 x 3 x 3 inches |
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