The APBX 8 R loaded enclosure was developed with reflex loading, with tuning designed to concentrate SPL in the lowest frequency range. The aim was to exploit the natural boost in output found in most cars below 60 Hz known as cabin gain. The 8-inch single 4-ohm voice-coil subwoofer has a powerful motor that maximizes efficiency in combination with the AP8.9 bit amplifier. The low-resonant frequency of the subwoofer, matched to the reflex enclosure keeps excursion low within the entire audio spectrum, also allowing the use with a pair of AP4.9 bit / AP4 D bridged channels, capable of delivering 260 W rms. This neat little subwoofer and enclosure combo is reflex loaded and tuned to develop high level at low frequencies. Exploiting the natural boost in output found in most cars below 60 Hz known as cabin gain, the 8-inch single 4 Ohm voice-coil subwoofer has a powerful motor that maximises efficiency. This makes the APBX 8 R the perfect companion to the Audison Prima AP8.9-bit amplifier. The low-resonant frequency of the subwoofer, matched to the reflex enclosure keeps excursion to a minimum within the entire audio spectrum offering exceptional output from a modest amplifier such as bridged channels of an Audison Prima AP4.9 bit / AP4 D delivering 260 W rms. : 473 (18.62) x 334 (13.15) x 109 (4.29) Magnet: High density flux ferrite Cone: Cotton-Fibre pressed paper Weight of one component kg (lb): 6.64 (14.64). We offer a collection service on some of our items. Please call our retail shop before collecting an item. WE DO NOT REPLY TO ANY DIRECT EMAILS. Motor Solutions are proud suppliers of a wide range of products from some of the top vehicle security, multimedia and accessories manufacturers including Clifford car alarms, Smartrack vehicle trackers, Cobra motorhome security devices, and Snooper Ventura sat nav systems for motorhomes. In addition to the great range of vehicle products we supply and fit, we are also able to offer a fully comprehensive engine remapping and tuning service for most makes and models of vehicle from cars to motorhomes. This service enables our customers to use their vehicles safely to their maximum potential. When your vehicle is running at its best you will be reducing your fuel bill as well as your carbon footprint. We are confident that you will find everything you need and more at Motor Solutions. Thanks For visiting Motor Solutions.