The dilemma: You want a pair of high efficiency stereo/HT mains that
will give you 99dB/watt sensitivity down to 80 Hz. You don't have room for
large horn-loaded enclosures, you can't afford to spend a lot of money, and
your woodworking skills are too rudimentary to build a complicated cabinet.
The answer: TLAH.
The TLAH combines the features of line array, transmission line and horn-loaded
enclosures in an easy to build cabinet. Only 40 inches or so high, and
extending less than ten inches into the room, these speakers project a huge
soundstage similar to that formerly available only with large horns. You may
wall mount them in a room corner as shown, or hang them mid wall. You can use
them freestanding as well, or stand mount them. They make a perfect main
speaker system to compliment Tuba 18 or AutoTuba subs. Here's a 1m/1W SPL
chart, measured outdoors, full-space:
Performance rivals commercial speakers that cost hundreds and even thousands
of dollars, but they can be built for less than $150 apiece with commonly
available drivers. If you're lucky enough to find closeout drivers you can
build them for even less. A lot less. An awful lot less. The originals were
built at a total cost, including lumber, of $60. For the pair. End of dilemma.
Also included: plans for a six foot high pro-sound version of TLAH, loaded
with 8" drivers.
With well over 100dB/watt sensitivity, and the
long-throw clarity than only a line array can give, this speaker is especially
well suited for permanent installations in acoustically harsh environments,
such as churches and gymnasiums.
Construction Degree of Difficulty: 5
Performance Quotient: 10
Equivalent Retail Value: $ 1299
Plans are $14.95, delivered within 24 hours as email attachment in MS Word
format. 17 Pages, 16 Photos, 8 Diagrams.
PDF available on request.