Ignoring any potential HF reflections off the frame/motor:Originally Posted by cradeldorf
Radiation from a Baffled Piston
Radiation from monopoles, dipoles, quadrupoles
Sound Radiation from Cylindrical Radiators
GM
Loud is Beautiful if it's Clean! As always though, the usual disclaimers apply to this post's contents.
No amount of degrees is going to make them in phase, it is just impossible.
They will be in and out at different wavelengths. it is a flawed design period, you just can NOT cheat physics.
Imperfect speakers can still sound decent. But don't think you are gonna find a magic trick that ain't there.
Your neighbors called. They like your music.
Hate to be a critic, but the first thing a baffle does is separate front and back waves. Since your design does not you put one foot in the grave. Bad idea in my book.
If you want a flat baffle you have to make it large enough so that sounds from the back and front are isolated.
Your neighbors called. They like your music.
Yep I agree. LOL although It took the long way to get through my head.
Yep, BLHs can sum to sound as one out to the rear pipe's/horn's 3rd harmonic, so only good for ~2 octaves before the frequency response turns into an increasingly sawtooth looking one. For wide BW use then, the horn either needs some throat damping and/or folded in such a manner to mechanically attenuate its higher BW off the back of the driver.
GM
Loud is Beautiful if it's Clean! As always though, the usual disclaimers apply to this post's contents.
Thanks for the sites GM. This will take a while to absorb. Will report back with couple more questions when Iv'e reread it a few more times.
Totally agree, they can only be used over a limited bandwidth which is why they are pretty much just pro sound subs these days....
I might have said "close enough to sound as one" but lets not quibble semantics.
Your neighbors called. They like your music.
They can be made to work well in wide BW apps such as with 'full-range' drivers, but for best performance overall they must be designed with a fairly low acoustic XO, which is too often ignored and why so many designs I've auditioned or seen posted on the various forums either have a 'hole in the middle' of its response and/or sound too 'phasey'/'muddy' through the mids due to excessive front/rear output timing errors to qualify as 'HIFI' for me.
Agreed, that wasn't my intent.
GM
Loud is Beautiful if it's Clean! As always though, the usual disclaimers apply to this post's contents.
Duh...meant to mention what you said about designing in HPF beige quite useful. Just dropped out of brain.
Kinda doubt the average user could do that though, so I do try and err on the safe side.
My attention span is too short these days to walk a newb thru a large can of worms.So I just try to not get into doing it. I'll be talking about something else before the conversation is over.
Your neighbors called. They like your music.
Since were on the subject of BLH's is there an easy way to calculate the horn? I read all night different pages on horn design, downloaded hornResponse and got nowhere. Here is a design I came up with. It's 40 w x 30 H x 18 d. The horn will exit out the side.
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