Activate Your Bass

Low Rumbles From A Tiny Box

The Prima range of OEM integration products from Audison is already seen by some installers as the saviour of car audio upgrades. The range continues to expand as new and exciting products, such as this blinding active bass box are developed and launched.



When you get it right, bass enhances the music and does not swamp or override other frequencies in anyway. If this is not the case then the balance across the full audio spectrum is distorted giving music “colour” that was not intended by the artist.


Poor bass reinforcement may well impress when listening in the car showroom but will generally show its true flaws once the car is driven a few miles. On long journeys the bass can become very fatiguing.


Prima passive subwoofers have been wowing purchasers by providing seamlessly integrated, musical sub bass to systems with relatively low power requirement, but the new APBX 10 AS.2 raises the bar yet again.


The neat and beautifully finished box seems to disappear into the luggage compartment of a car and is small enough to be located elsewhere in some circumstances. What makes this product exceptional however, is what happens inside. 



The amplifier module in the APBX 10 AS.2 is specific to this product and runs 400 watts continuous perfectly happily into a load of 0.16 ohms. Yes, you hear right! Not 4 ohms or 2 ohms but 0.16! It has long been known that Class D amplifiers can run at theoretically low levels but up to now there has been little point doing so, as there were no subwoofers around with this kind of impedance figure.


In order to create a compact box, a good deal of work has gone into the cooling of the voice coil. Traditionally, this is achieved by venting the heat through one or more holes in the base plate of the speaker. In order for this kind of venting to work however, some space is required between the rear of the speaker and the back wall of the cabinet. Audison has developed a method of venting heat through holes in the basket underneath the spider. This means that the speaker can sit flush with the rear wall of the cabinet allowing it to be much slimmer.


An additional physical feature has been built into the sealed enclosure. It can be mounted with the speaker cone toward the floor or wall or facing away from it. The physical proximity of a floor or wall can increase the low-end extension, however, this will affect the cut off at the other end of the bass spectrum as well as the dynamic response. Similarly, mounting the APBX with the speaker upward facing improves punch and dynamic response. Having tried this, it does make quite a discernible difference. Velcro standoffs are provided if you decide to mount your box on the floor firing downwards. 



Returning to the amplifier module, this features a 12dB/octave Butterworth low-pass filter. Featuring adjustable cutoff frequency between 50 and 300Hz, the filter can be bypassed when a bit amplifier or other external processor is used. There is also a 6dB bass boost adjustment that operates around the 45Hz area for emphasizing low sub bass if required. A gain control is also provided for set up and a wired remote level control is included so drivers can adjust the level as they drive to compensate for road noise cancellation.


At the time of writing the Audison Prima APBX 10 AS.2 is priced at £499.99. For comparisons sake, the physically very similar passive box, APBX 10 DS is priced at £329.99 and the matching AP 1D mono block amplifier is £319.99. On this comparison it is easy to see that the active equivalent offers superb value for money. 

Car Audio Upgrades Made Easy

In association with our partners The FOUR MASTER Network, we are able to provide you with a no obligation custom quote on a system for your car.

Not ready for that yet? Why not book a demonstration at your home, place of work or with your local FOUR MASTER?