|
Audio Asylum Thread Printer Get a view of an entire thread on one page |
For Sale Ads |
71.39.40.4
In Reply to: Re: Countering pipe modes posted by DMoore on January 30, 2007 at 17:10:17:
I should mention, ELENA's approach is necessary due to the horn's Fc being well above the Fr (back chamber resonant frequency) required to be much lower in frequency to capacitate the front reflex port which is tuned well below the horns Fc. The issue is exascerbated by the porting, in other words, as it means the driver cannot be annulled.This is not quite the same as a front-loaded of short pathway length which is capable of being annulled. Through the combination of multiple flare-rates AND reactance annulling, the reactance problem cited previously caused by the short pathway is reduced sufficiently.
Follow Ups:
Very interesting. Incorporating several resonators, each to individually annul a specific standing wave node from the horn. That's an interesting way to smooth the impedance peaks. Thanks for the link!
I don't believe it is all that unique. A number of the lowther cabinets have ported cavities adjunct to the horn path, though off the top of my head the only one i can see in my mind is ported to the outside.
How many of those Lowther-types are front-loaded reflex-ported horns?
My pleasure, sir.I thought it was a unique approach too.
Another methodology to control reactance peaks is disclosed in the 1956 Glenn (General Electric) patent # 2,765,864.A rear-loaded, short-length, unitary-pathway folded horn, this time with a purposely undersized mouth...
This post is made possible by the generous support of people like you and our sponsors: