Microsubs
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. |