The Subwoofer DIY Page
"Exotic" Technologies
20 October 2018
Microsubs are small (typically less than 1 cu.ft. in volume) subwoofers that can produce very low frequencies at SPL levels suitable for home theatre use. They are typically characterized by one or more long-throw drivers deployed in a sealed or passive radiator alignment driven by a high power built-in amplifier.  The most commonly known microsubs are the Sunfire True Subwoofer series of subwoofers, which pioneered this type of design. For the DIYers,  Peerless produces a series of drivers that are designed to be used in small boxes (in passive radiator alignments), all one needs to do is build the box and add appropriate amplification and equalization.

LAT drivers
The Tymphany LAT driver is a slim transducer that uses a series of small diaphragms to produce sound, the primary advantage being its geometry, which allows for its use in locations where the equivalent 10" or 12" drivers cannot be deployed (e.g. on an automobile's rear deck, if it is less than 10" wide). Another advantage of the LAT driver is that it's supposed to be vibration-free, due to its use of motors on each end, which eliminate structural vibration.

Rotary drivers
Rotary drivers dispense with the push-pull motors used in most cone drivers and instead use rotary motors and vanes or diaphragms to produce sound. The primary advantage of rotary drivers is their considerable volumetric displacement capabilities (compared to standard cone drivers), which makes them ideal for subwoofer duty.  They are however more complex than cone drivers, and this complexity typically leads to higher costs and possible lower reliability. One examples of a rotary drivers is the Eminent Technology Thigpen rotary woofer