High Efficiency Speaker Asylum

RE: is it ok to examine some BLH horn by converting to FLH?

75.109.11.25

freddyi

In Reply to: RE: is it ok to examine some BLH horn by converting to FLH? posted by Paul Eizik on July 18, 2007 at 09:25:09

yeah Andy's box was clamped over the front so only the rear horn would work - - - - hit "F11" and see if pic opens to fit your browser screen
Graph Again

Andy's horn for Fostex
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for this style BLH there should be certain bulk and parameters to give common cutoffs (70/60/50/40/30) without peaking
RCA-Fan mentioned AJ-Horn being ~80% accurate - what happens if luck places the real thing in the other 20%?
seems to me the little fullrange BLH draw by far the most interest and coaxial's are shunned as bastards due to xover (and maybe size)
Freddy

Edits: 07/18/07 07/18/07 07/18/07

Follow Ups:

RE: is it ok to examine some BLH horn by converting to FLH? - Paul Eizik 19:45:39 07/18/07 (0)
Fred

Bulk and perameters here should follow from general horn mouth and horn length procedures, mitigated by space radiated into etc.. 70 Hz is kinda big, with WAF Z increasing exponentially as 30 Hz is approached. Below 30 Hz, the horn would be large enough to live in, following projected divorce (best dang stereo in the trailor park!). Can anyone verify (in a real world horn) that 145 Ohm peak in your sim @ 18 Hz? It seems a bit far fetched, but I've only looked at mine down to 20 Hz or so. I'll have another look with the oscillator when I'm back up and running again. Thanks for giving me something else to worry about : )

If you wind up with a 20%er with the AJ sim, that's when a sawzall comes in handy. Any driver on any horn does something, to paraphrase Tom Danley. So try a different driver, or start cutt'n some wood, or both. Push on those perams.

The full-rangers do draw some interest due mainly to their relatively small size and simplicity. One can bask in the simplicity of having no crossover, untill one realizes that there is in fact a crossover between the direct radiator and the horn (and also one between the cone and whizzer too). But things aren't all that bad as they seem, they're actually much worse as there is a 90 degree phase shift between the transfer functions of the horn and direct radiator, not to mention a continuous time lag in the direct radiator itself, which increases with frequency as Tom Danley has also pointed out. At least the whizzer should be in step with this. So full-rangers have no reason to cop an attitude over co-ax guys.

Sometimes ya have to just let the music play.

Paul

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