That quote from Bill himself ages ago in another thread.Who ever said that?
And he has now repeated it.
I've seen many people in this forum say something like "with the DCX use LR48". It makes sense to not go past LR24 (with the DCX) when that is the steepest slope on the Driverack series.
Have I got this wrong? You set a HP with a slope, let's say at 40Hz. I thought the slope commenced at 40Hz. Even if it doesn't and the slope actually begins at (eg) 41 or 42Hz, you may see a reduction of (guestimate) 1dB at 40Hz and how does this mean I should have built smaller subs?A high-pass effectively neuters extension...so it simply doesn't pay to build a pile of cabs without allowing them to deliver their maximum low freq potential. That's the whole point of the design. Get too aggressive with the filtering and you'd have been better off building smaller subs to begin with. In short, don't use 48 dB /oct.
Isn't the purpose of a HP to protect the driver from over excursion at that point, not stuff with the rest of the frequency range of the cab?
I now wondering, with a result of a few Hz at best (using the method above, thanks for detailing it), if extension is perhaps best left unmentioned.Yes, use a woofer tester to take an impedance sweep of one cab. Note the freq of the spike near Fc. Then assemble the entire stack, wire them all in parallel, and sweep again. Once more, take note of the freq of the spike near Fc. It'll have shuffled down by a few Hz. That'll be how much extension you've picked up by adding cabs. Results will vary depending on model, width, and number of cabs used.
Pumpsfast, I don't know if path length enters into the extension equation.
Thanks all...