Audison Prima APBX 8 R 8" Passive Compact Subwoofer Sub Ported Enclosure 250w

The Audison Prima APBX 8 R is a compact, slot-ported 8-inch passive subwoofer enclosure from the Audison Prima range, rated at 250W continuous (500W peak), with an ultra-low 131mm profile and a single 4 ohm driver.

This listing is the ported, single 4 ohm version. The Audison Prima APBX 8 DS is the sealed, dual voice coil alternative, and the driver used here is also sold separately as the Audison Prima APS 8 R.

Key specifications

• Driver: 8 inch (200mm), single 4 ohm voice coil
• Power: 250W continuous / 500W peak
• Enclosure: reflex, slot-ported
• Height: 131mm ultra-low profile
• Dimensions: 470 x 334mm
• Mounting: 2S² down-firing or up-firing
• Connection: SSP (Sub Smart Plug) plug and play terminal block
• Included: metal grille, levelling feet with Velcro inserts

Prima APBX 8 R: Subwoofer Box, 500W Peak Power, 200mm, 4 ohm sub box

The APBX 8 R loaded enclosure uses reflex loading, tuned to concentrate SPL in the lowest frequency range. It is designed to exploit cabin gain — the natural boost in output found in most cars below 60 Hz.

• Ultra-low profile (5.16 in. / 131mm) slot-ported box, tuned to work with the APS 8 R driver.
• 2S² (2 Sides/2 Sounds) design lets you choose between Down-Firing mounting for extended low-frequency reach, or Up-Firing for more punch and definition.
• Levelling feet with Velcro inserts included for a secure grip on boot carpet, with easy removal when needed.
• SSP (Sub Smart Plug) provides both traditional push contacts and a Plug-&-Play terminal block for simple impedance configuration and quick release.
• Rounded corners aid easy positioning in the boot and reduce enclosure resonance.
• Cone, dustcap and basket geometry designed for a long linear excursion capability (9mm, one-way).
• Massive motor assembly optimised with FEM (Finite Element Modelling) for control under high excursion conditions.
• Water-repellent pressed paper 8 in. cone, profile developed with FEM and optimised with the Klippel Scan Vibrometer.
• Designed to pair with the AP8.9 bit (2 CH bridged) or AP4.9 bit / AP4 D (2 CH bridged) amplifiers, taking advantage of the bass boost feature and integrated parametric equaliser of the built-in DSP.
• Sturdy metal grille included for full driver protection.

The single 4 ohm voice-coil driver has a powerful motor optimised for use with the AP8.9 bit amplifier. Its low resonant frequency, matched to the reflex enclosure, keeps excursion low across the audio spectrum — allowing use with a pair of AP4.9 bit / AP4 D bridged channels capable of delivering 260W RMS.