【Prima AP 8｜20cm Woofer for Adding Body to In-Car Sound】

I want a little more thickness to the sound from the factory speakers. When I turn up the volume, the sound feels thin. I’d like to enjoy the vocals and instruments in a more natural way.

If you’re looking for that, the model to consider is the AP 8 from the Prima series.

This 20cm woofer supports playback from 35Hz to 3kHz. It doesn’t just boost the quantity of bass; it firmly supports the foundation you need when listening to music inside the car. Even with the music you listen to every day, you’ll likely notice changes in the thickness of the low end and the presence of the sound.

Another feature of the AP 8 is its output sound pressure level of 93.5dB/SPL. It’s spec’d in a way that makes it easy to consider even when you’re thinking about replacing speakers in a system that makes use of a factory navigation system or factory audio.

The AP 8 uses a design that radiates sound from the same point, aiming for a linear acoustic response. It helps suppress the unnatural sense of sounds separating when you listen to music in the car, making it easier to aim for playback that feels cohesive overall.

The Finish Changes with the Installation Method

With a size of 20cm, the installation space and the differences versus the factory speakers can vary significantly by vehicle model. It’s necessary to check not only the dimensions of the mounting hole, but also the depth, the clearance inside the door, the relationship with the factory grille, and more.

Even when using the same AP 8, how it sounds can change depending on how the mounting surface is made, the mounting method, the treatment on the door side, and the compatibility with your factory audio. Rather than replacing only the speakers without thinking, it’s important to confirm the vehicle model and your current system, and then consider how much work (and improvement) is worth doing.

Depending on the vehicle, there may be strict constraints regarding the mounting position. When considering the AP 8, the surest approach is to check mounting feasibility, any necessary modifications, and how it pairs with other speakers and amplifiers while looking at the actual vehicle.

If it were me, I wouldn’t decide based on speaker replacement alone. I’d choose after confirming the music and volume I usually listen to, as well as the configuration of the factory system. That’s because organizing together what to spend money on and what parts you can leverage in the current system is more likely to lead to satisfaction after installation.

Whether the AP 8 fits your vehicle—and what installation method would be best—depends on the vehicle model and your current specifications. If you want more sound body or are thinking about stepping up from the factory speakers, let’s determine the direction together while listening to how you use the car and your preferences.

Main Specifications / Specs

【Basic Information】

• Product name: AP 8
• Series: Prima
• Type: Set woofer
• Included items: Grille

【Playback Performance】

• Playback frequency range: 35Hz–3kHz
• Rated input: 100W
• Input impedance: 4Ω
• Output sound pressure level: 93.5dB/SPL

【Installation Dimensions】

• Mounting hole diameter: 174mm
• Mounting depth: 66mm