Always wanted to try to build a transmission line speaker, but given the same outer dimensions (ie same internal volume)
Wich cabinet will yield the best low end/bass performance in terms of the lowest -3db produced?
This is the driver I intend to use, and in combination with peerless CT62H, and only a 1.st order filter on the tweeter. No filter on the bass midrange. I have used this combination in a car before, with surprisingly good results.
Wich cabinet will yield the best low end/bass performance in terms of the lowest -3db produced?
This is the driver I intend to use, and in combination with peerless CT62H, and only a 1.st order filter on the tweeter. No filter on the bass midrange. I have used this combination in a car before, with surprisingly good results.
As far as I know (and i might be completely wrong!) "classic" transmission lines have quite uneven frequency response above their intended pass-band which is usually too low for a 2way speaker - unless you correct it with filters.
You could try a tapered or mass loaded quarter wave resonator, instead. These are better in acousically filtering out midrange from the port.
Bass reflex can be defined as mass loaded qw-resonator with a very short pipe.
You could try a tapered or mass loaded quarter wave resonator, instead. These are better in acousically filtering out midrange from the port.
Bass reflex can be defined as mass loaded qw-resonator with a very short pipe.
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Best way to find out is via hornresp. I'm not really sure which would give the best results just on volume. The qts is in the range for transmission line, the lower the qts the steeper the slope of bass extension. Qts is on the upper general range for bass-reflex, helmholtz resonators will always be more compact for the resonant frequency, but has a steeper slope, so for purely F3 I think bass reflex could be better, but for a smoother roll off into the low end TL will probably be better.
1/ The volume of a decent TL is usually considerably more than an optimum reflex.
2/ if the box is a tower, it is VERY likely an ML-TL and nor the reflex you intended.
Optimum sealed (q=0.707) is about 50 litres, optimum miniOnken about 100 litres (miniOnken alignment tends to generate smallish boxes), but i can get an OK alignment down to 50 litres.
You’d have to model it but i expect an optimum TL to be considerably larger.
dave
2/ if the box is a tower, it is VERY likely an ML-TL and nor the reflex you intended.
Optimum sealed (q=0.707) is about 50 litres, optimum miniOnken about 100 litres (miniOnken alignment tends to generate smallish boxes), but i can get an OK alignment down to 50 litres.
You’d have to model it but i expect an optimum TL to be considerably larger.
dave