【MA-40FX｜Digital Power Amplifier with 75W×4ch in a Compact Body】

You want a bit more power and room from your factory audio, but it’s hard to find space to install a large amplifier. If that sounds like you, consider MA-40FX.

With a compact body size of 185×53×235mm, it still delivers RMS output 75W×4ch at 4Ω. It’s a configuration that’s easy to use when you want to drive the front and rear speakers properly, or when you want to add an amplifier after replacing the speakers to bring out more headroom in the sound.

It combines low current draw typical of digital amplifiers with low distortion of harmonic distortion rate of 0.05% or less. Not only does it help make up for lack of power when you turn the volume up, but it’s also suited to requests like wanting to hear vocals and instrument sounds more clearly. When listening to your usual songs, you may find the entire cabin feels easier to hear thanks to the added volume headroom.

In addition to standard RCA inputs, it also supports high-level inputs, which are convenient to use together with factory audio. With high-level input, you can also use an auto power-on function that doesn’t require a remote signal input.

Furthermore, the built-in crossover function is of the variable type, allowing frequency settings between tweeters and midranges. It also includes a bass boost function, making it an amplifier that’s easy to tune to match your speaker setup and how sound carries in the vehicle.

However, an amplifier won’t produce the exact same sound just because you mount the unit. The final result varies depending on how you connect it to the factory system, how you take power, the installation location, the combination with speakers, and the crossover settings. If it were me, I’d first check your current system and “what you’re concerned about,” then organize whether adding an amplifier is truly the right fit.

We can think together based on your vehicle model and how you plan to use it—such as whether the MA-40FX suits your car or whether pairing it with speaker replacements or a subwoofer would be better. It’s recommended for people who don’t want to decide products just for the sake of it, but instead want to proceed while consulting on a setup that allows you to enjoy music comfortably after installation.

Main Specifications

【Basic Information】
Product name: MA-40FX
Type: 4ch digital power amplifier

【Output】
Rated output: 75W×4ch (RMS at 4Ω)

【Input】
RCA input: Yes
High-level input: Yes
Auto power-on function: Usable with high-level input

【Sound Quality / Adjustment Functions】
Harmonic distortion rate: 0.05% or less
Built-in crossover: Variable type
Supported adjustment range: Frequency between tweeters and midranges
Bass boost function: Yes

【Dimensions】
Width 185 × Height 53 × Depth 235 mm