A basic design for a 2 driver speaker would be to install 2 A3’s in a 5L sealed box. Wall mounting will eliminate the baffle step and enhance bass response. Outside dimensions of a 5 L box can be 12” high x 6.5” deep X 7.5” wide, using ¾” material. We recommended that the box be well sealed as these drivers are capable of generating real bass power. No bracing is required when using ¾” enclosure material. A full handful of loose wool is recommended for cabinet damping, adjust to your taste. The A3 drivers should be flush mounted and the cutouts need to be very generously beveled inside away from the driver to un-shroud the back side of the cones.

For in room positioning, ports can be used to increase the bass output, however, with some tradeoffs. At frequencies below the port tuning the driver becomes unloaded allowing free motion. This can lead to over excursion and driver damage if played to loud. One way to avoid this is to tune the port to 45Hz or less leaving little program material below this frequency to cause a problem. With a 6L volume per driver, 45Hz tuning will give 40Hz at -3db. A good solution is to use 4 or more drivers in a proportionately larger enclosure to handle the low frequency power.