Originally Posted by
RMC
Hi Macaroonie,
I'm looking right now at a scoop 4520 type (2 X 15") plan given by George Augspurger long ago and the dimensions shown for the rear chamber are: 6.25" D X 15.25" H X 34.25" W = 3,264.5 cu.in. or 1.889 cu.ft., again this is for the two woofer version.
So this gives an idea of how small that chamber is, then figure about half of this for one driver cab 4530. You get almost a cubic foot per driver... Not a whole lot, and no wonder very low Qts drivers are usually the most suitable for this task, plus don't normally lead to good deep bass.
To get otherwise the box would need to be HUGE. Still clever Engineering though, in my view, for what its designed to do.
Exactly, punchy bass cabs as you say, I described that elsewhere as amplitude in response, instead of bandwidth as in VLF.
RE "... you know punchy can give the impression of deep bass." Yes it can fool many, couldn't agree more with you on this. But since most of these type of cabinets were installed in dance clubs in the old days, then punchy met the beat/rhythm requirement of dance floors. Regards,
Richard