Audison Prima APBX 8 AS Active Sub Box. Elevate your car audio experience with the Audison 8 Active Subwoofer! This top-of-the-line enclosed subwoofer boasts a power output of 250 W RMS and a single voice coil for enhanced sound quality. The sleek black design and 4? Impedance make for a versatile addition to any vehicle. Audison prima AP8.9 bit. The AP8.9 bit amplifier was designed by Audison R&D Department to achieve maximum sound quality in OEM Integration applications. The powerful management software proves the ability to acquire the bit Drive presets which the Audison team fine-tuned specifically for your car. Thanks to the innovative power supply stage, a power of 520 W total can be achieved in an extremely compact case. The non-amplifiable ninth channel can be used to drive a subwoofer. This subwoofer is designed by the industry-leading brand Audison and is part of their Prima line. Paired with the Audison Prima AP8.9 bit, this subwoofer is a must-have for any car audio enthusiast looking for high-quality sound. Upgrade your car audio system now with this top-notch subwoofer! This is an amazing sound system I’ve just had professionally removed from my mini clubman by a mini/bmw dealer, unfortunately there’s not enough space in my new 3 door mini and I can’t sacrifice the tiny boot space so it has to go! It includes a volume controller that can be used near the driving controls, which is handy for controlling the bass! The only other thing for me to note is that It’s missing the plastic feet which allow the speaker to be upside down, I personally preferred the sound firing upwards and has Velcro for this orientation so really not necessary. Fully working order approximately 2 years old.