Hello -
Back in 2000 I built a set of Voigt pipes from plans I found on the 'net. They sound great but now that I have a better shop I want to play with other single-driver designs, especially mass loaded transmission lines. I now own a set of Tang Band W8-1772s but have no cabinet to put them in.
Thing is, design information about these has disappeared! Martin J King has disabled his MathCad, Bob Brines has gone silent, and the websites I used 20 years ago are long gone. Everything I can find seems to be from sketchy sources from the back alleys of the the internet.
I'm a woodworker, not an engineer... where can I find a good set of science-based plans than match my drivers?
Thanks for your assistance,
Jason
Back in 2000 I built a set of Voigt pipes from plans I found on the 'net. They sound great but now that I have a better shop I want to play with other single-driver designs, especially mass loaded transmission lines. I now own a set of Tang Band W8-1772s but have no cabinet to put them in.
Thing is, design information about these has disappeared! Martin J King has disabled his MathCad, Bob Brines has gone silent, and the websites I used 20 years ago are long gone. Everything I can find seems to be from sketchy sources from the back alleys of the the internet.
I'm a woodworker, not an engineer... where can I find a good set of science-based plans than match my drivers?
Thanks for your assistance,
Jason
Using the published spec. Q is a bit lower than ideal. You don't mention what amplifier you're using, but assuming 0.5ohm series R for typical speaker wire loop resistance, connection losses, you could try this:
L = 72in
St = 0
Sl = 140in^2
Zd = 36in
Zv = 68in
Dv = 3in
Lv = 3/4in
Lag back & one sidewall 1in OC-703 acoustic fibreglass board or its equivalent rockwool, SAE-F10 rated felt, jute carpet underlay or similar. Avoid egg-crate foam.
Fb [Fp] = 40Hz
F3 = 40Hz [nominal anechoic]
F6 = 34Hz [nominal anechoic]
Should work fine for SET amplifiers with an output Z up to about 3ohms, slightly more damping around tuning.
Should do a reasonable job; it's is purposefully not hyper-refined -I've used a slightly broader tuning since we're keying purely off the published data and most people seem to favour a slightly more resonant pipe characteristic. If you want it cleaner, lag all internal faces to about 6in below the driver, then back & one sidewall for the remainder.
L = 72in
St = 0
Sl = 140in^2
Zd = 36in
Zv = 68in
Dv = 3in
Lv = 3/4in
Lag back & one sidewall 1in OC-703 acoustic fibreglass board or its equivalent rockwool, SAE-F10 rated felt, jute carpet underlay or similar. Avoid egg-crate foam.
Fb [Fp] = 40Hz
F3 = 40Hz [nominal anechoic]
F6 = 34Hz [nominal anechoic]
Should work fine for SET amplifiers with an output Z up to about 3ohms, slightly more damping around tuning.
Should do a reasonable job; it's is purposefully not hyper-refined -I've used a slightly broader tuning since we're keying purely off the published data and most people seem to favour a slightly more resonant pipe characteristic. If you want it cleaner, lag all internal faces to about 6in below the driver, then back & one sidewall for the remainder.
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As narrow as practical, width & depth could be shuffled for a wider less deep box.
http://wodendesign.com/downloads/Sranger-MLV-W8-1772-061220.pdf
dave
http://wodendesign.com/downloads/Sranger-MLV-W8-1772-061220.pdf
dave
Scott and Dave, I am genuinely astonished at the generosity with which you have given your time. Scott, thank you for researching the specs for my drivers. Dave, you are -the best- for making a drawing for me!
Good news is that the volumes you spec are pretty much identical to the Voigt Pipes I built way back when – looks like with some minor tweaks I can just drop in my new drivers.
GM – Hornresp looks like a great resource. I’m glad that the DIY design community still has tools to play with.
Thank you all again!
Cheers,
Jason
Good news is that the volumes you spec are pretty much identical to the Voigt Pipes I built way back when – looks like with some minor tweaks I can just drop in my new drivers.
GM – Hornresp looks like a great resource. I’m glad that the DIY design community still has tools to play with.
Thank you all again!
Cheers,
Jason
