【AP 4 10cm Mid-Bass Speaker | Speaker Replacement for Naturally Balanced Sound Inside the Car】

You want a bit more thickness to the sound from the factory speakers, and you’d like vocals and instrument tones to be easier to hear. If so, the one to consider is AP 4.

This 100mm mid-bass speaker is designed to radiate sound from the same point, making it easier to achieve a well-connected soundstage and aiming for a natural listening experience inside the cabin. The midrange—such as vocal voices, guitar, and piano—comes together coherently, and it’s a model that’s designed to help reduce the sense of sound scattering, even when you listen to your usual music for long periods.

Its playback frequency range is 80Hz to 7.5kHz. As a mid-bass speaker that covers from the bass foundation to the midrange, it’s well suited for those looking to rethink the front speaker setup inside the car. Its comparatively compact installation size and 43mm mounting depth are also key features, making it an easier size to consider even when space around the speaker is limited depending on the vehicle.

However, speaker sound isn’t determined only by swapping the speaker unit itself. Depending on the installation method, how the mounting base is built, the condition of the door side, and the combination with your existing system, the impression can change even with the same speaker. If it were me, I would first check your vehicle’s factory speaker size and available installation space, then guide you after confirming whether a configuration that takes advantage of the strengths of the AP 4 is possible.

Depending on your vehicle model, your current audio setup, and the music you listen to most, the best installation method and combinations will differ. Whether you can proceed with a simple speaker swap or whether it’s necessary to consider door-side treatments and adjustments—let’s sort that out together. If you want to choose an approach that won’t leave you thinking later, “This doesn’t sound like what I expected,” feel free to consult us.

Main Specifications / Specs

【Basic Information】

• Product name: AP 4
• Type: Mid-bass speaker
• Size: 100mm

【Performance】

• Playback frequency range: 80Hz to 7.5kHz
• Rated input: 40W
• Input impedance: 4Ω
• Output sound pressure level: 91dB/SPL

【Mounting Dimensions】

• Mounting hole diameter: 93mm
• Mounting depth: 43mm

Let’s create great sound with a reasonable, stress-free configuration—while confirming the appropriate installation method for your car and how well it matches your current system.