I built a pair of these speakers in the past and was wondering why I don't see more of them around.
They were easy to build, the sound was decent with the driver I used which was a low end Radio Shack RS 40-1354. Using something like a Lowther, or Fostex, the sound can be very nice.
Any thoughts?
Here's a bit of info on the TQWT, or a ML TQWT, ML= Mass Loaded.
First described by Paul Voigt in 1930, TQWTs allow a good quality-to-price ratio. They are also easy to build.
Similar to transmission lines, the TQWT is different by its shape, a kind of horn is used as back load but the driver is not placed at the beginning of the cone as usual but on its side.
The port is used to adjust the rear flow according to the driver type, internal damping and desired response.
The resonance frequency depends only on the length L of the cone and the driver position is calculated by the formula indicated on the schematic.
During the tune-up, it's a good idea not to close definitely a side of the box to allow an easy modification of the internal damping.
The height of the port should also be adjusted through both measurements and listening sessions.
It's not advisable to select a very low frequency cutoff as a not very refined bass could be obtained.
The TQWT adapts very well to full-band drivers or bass-medium drivers of small dimensions.
The folded horn gives a very practical loudspeaker with a driver positioned at the right height without any support.
(info courtesy of http://www.bonavolta.ch/hobby/en/audio/tqwt.htm)
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They were easy to build, the sound was decent with the driver I used which was a low end Radio Shack RS 40-1354. Using something like a Lowther, or Fostex, the sound can be very nice.
Any thoughts?
Here's a bit of info on the TQWT, or a ML TQWT, ML= Mass Loaded.
First described by Paul Voigt in 1930, TQWTs allow a good quality-to-price ratio. They are also easy to build.
Similar to transmission lines, the TQWT is different by its shape, a kind of horn is used as back load but the driver is not placed at the beginning of the cone as usual but on its side.
The port is used to adjust the rear flow according to the driver type, internal damping and desired response.
The resonance frequency depends only on the length L of the cone and the driver position is calculated by the formula indicated on the schematic.
During the tune-up, it's a good idea not to close definitely a side of the box to allow an easy modification of the internal damping.
The height of the port should also be adjusted through both measurements and listening sessions.
It's not advisable to select a very low frequency cutoff as a not very refined bass could be obtained.
The TQWT adapts very well to full-band drivers or bass-medium drivers of small dimensions.
The folded horn gives a very practical loudspeaker with a driver positioned at the right height without any support.
(info courtesy of http://www.bonavolta.ch/hobby/en/audio/tqwt.htm)
