williamN
Agent
- Joined
- May 6, 2004
- Messages
- 30
I am thinking of trying the above Dan Wiggins special and was wondering if there was a plan available or if anyone had tried building one and could comment at all?
"For good "tight" sound, a Q of 0.577 is often used. It's maximally flat in terms of phase rotation (group delay). But, for HT, you wnat pretty low Fc (down around 20 Hz or so). So, how's this:
175L per Tempest
64 ounces of stuffing
Tune to 17.5 Hz (4"ID by 13"L vent; note that our 4" flared vent kit would work well here - yes, that's a shameless plug...)
You'll have a response that:
Has an F3 anechoic of 22 Hz with the typical LFE crossover.
Is power limited to 500W above 15 Hz (for linear operation).
Mimics a 3rd order Q=0.577 Fc=20 Hz filter to +/- 0.25 dB down to 13 Hz.
Should provide a typical in-room F3 around 17 Hz.
Is capable of more than 110 dB SPL from 16 Hz and up, anechoic.
Is capable of more than 118 dB SPL from 17 Hz and up, in a typical room."
I estimated Dan used 15% internal volume increase caused by the 64 oz of polyfill stuffing - that gives an Lv of 13.05" So, I used an overall length of 14" on the dual-flare port tube. No "chuffing", no port noise and it continues to drop jaws
"For good "tight" sound, a Q of 0.577 is often used. It's maximally flat in terms of phase rotation (group delay). But, for HT, you wnat pretty low Fc (down around 20 Hz or so). So, how's this:
175L per Tempest
64 ounces of stuffing
Tune to 17.5 Hz (4"ID by 13"L vent; note that our 4" flared vent kit would work well here - yes, that's a shameless plug...)
You'll have a response that:
Has an F3 anechoic of 22 Hz with the typical LFE crossover.
Is power limited to 500W above 15 Hz (for linear operation).
Mimics a 3rd order Q=0.577 Fc=20 Hz filter to +/- 0.25 dB down to 13 Hz.
Should provide a typical in-room F3 around 17 Hz.
Is capable of more than 110 dB SPL from 16 Hz and up, anechoic.
Is capable of more than 118 dB SPL from 17 Hz and up, in a typical room."
I estimated Dan used 15% internal volume increase caused by the 64 oz of polyfill stuffing - that gives an Lv of 13.05" So, I used an overall length of 14" on the dual-flare port tube. No "chuffing", no port noise and it continues to drop jaws