PR Question (1 Viewer)

[Dustin B]

Is it possible to reduce the amount of Vp required by slot loading the PR?
What lead to me asking was this thread,
http://www.hometheaterforum.com/htfo...highlight=vmps
And the so far only response he got to my questions over on HD.
http://www.harmonicdiscord.com/forum...pic.php?t=6009

 

[Greg Monfort]

Yes, it's called a low pass filter and presents the diaphragm with a high acoustic mass load. If you have a small sealed speaker laying around, feed some LF into it while moving the baffle face ever closer to a wall to hear the effect.

This was a common technique way back when drivers had low Q so needed all the help they could get. A corner cab with a slot down the back, where the peak of the corner would normally be, combined with a small gap between the side of the cab and wall created a slot loaded reflex vent.

Regardless, this is an active design so you don't know what the effective parameters for the drivers are, so no way to figure the PR requirements. A single 15" may very well be adequate based on fiddling with sims, with loading only being required to offset excursion a bit.

GM