Audison APBX 8 DS boxed subwoofer 8" (200 mm).

Audison  APBX 8 DS (PRIMA series) boxed subwoofer 8" (200 mm).

The APBX 8 DS loaded enclosure provides the highest performance/ size ratio. 
For this purpose an 8.5 lt. sealed enclosure with a 4+4 Ω dual voice-coil configuration was adopted to exploit the full power of an AP5.9 bit (paralleling voice coils for a 2-ohm load) or with two pairs of 
AP8.9 bit bridged channels (one bridged pair of channels to each voice coil). 
The speaker’s high excursion capability allows the use of the proprietary BASS BOOST of AP bit amplifiers to make use of all the available power for rich and dynamic bass.