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In Reply to: Re: I can See AJ horn Has fallen into the Wrong Hands...shunt case don't look right posted by Bill Fitzmaurice on February 15, 2007 at 15:12:34:
hi Bill - that's almost a dead short so take a real constant-voltage source to get gain up - then that amount looks kinda odd (?)
Follow Ups:
Ah, you noticed that. The way these things work is to reduce system impedance,up the current draw and literally suck more power out of the amp, but if you go overboard you'll reduce the impedance too much and end up with all sorts of problems. As always no such thing as a free lunch.
still seems screwy as had to up inductor's DCR quite a bit for acceptable resultssealed box ~3rd order case at top of thread with 500uF cap and no low Z dip looked a pretty good tradeoff
vented box - tuned too low
Upping the inductor DCR gets the impedance up but also reduces the effectiveness of the circuit. You have to diddle with both the cap and coil values to find the combination that gives the best compromise between response and impedance. The excursion price isn't a price per se, you'd get that if you used EQ to fatten the response too. On the other end of the spectrum you can use a 2nd order LP filter to flatten out the upper end of a horn, compensating where the LP function of the horn kills the highs. Same caution applies, you can overdo it and get too low a Z.
See below. Lots of good links in that thread, including documents, Spice, etc.
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