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In Reply to: RE: Bass horn 100-600 hz posted by FlyCast on September 05, 2015 at 08:25:22
crossed to mid horn at 500 Hz. (picture above in the home of the previous owner).
Similar to...
http://www.volvotreter.de/downloads/Edgar-Show-Horn.pdf
Think it uses a 12 in. JBL musical amp driver (99 dB) re-coded without the metal dust cap?
IIRC the length of the folded horn is exactly 1/2 the path length of an complete sign wave at 500 Hz so it's wired 180 Deg out of phase with the mid horn and both horns us first order X-over.
Which, of course, is a problem as the mid-bass horn driver is only 6 dB down at 1000 Hz and 12 dB down at 2000 Hz and etc.
Same applies to the mid horn. Driver is seeing 6 dB down at 250 Hz., etc.
I am now of the opinion that horns should the bi-amped and use digital z-over (steep) with phase/delay correction.
Especially as I mostly listen to digital steaming anyway. :-(
Follow Ups:
Is that the Fane tweeter?
I was using an Audax because it was good enough and cheap, and I never quite liked the Fane. I just traded my TAD 4001s for a pair of Fostex T500a MK2s and it's quite a bit better as expected. On paper, it should need some padding to blend well, but I hoked it up wide open and if anything, it might be just a bit soft though I haven't run the test tones to really find out.
It does look cool too.
The Audax is that triangle shaped box which just sits on top, so I just set it aside and set the Fostex on top the mid box.
-Rod
Since treble is now less distorted and better replicated the amk2 will not draw attention to itself like other tweeters will thus tends to sound less harsh or as you say soft. I set Bill Gaw up with a pair he has a similar rig. You most likely will not need to attenuate it unless your attenuating midrange. I would just run a capacitor works best like this in systems such as yours but YMMV.
'Soft' is perhaps a poor choice to describe the sound. I'd expected to need to attenuate the T500 a bit from my experience with Terry Cain's addition of lesser Fostex tweeters to his Big Bens. In that case the treble was over hyped and I thought the speaker sounded better without it all together. I had similar impressions of the Fane driver in the Edgar Horns, too splashy.
As you suggest, all I did is remove the old tweeter and hooked up the T500 to the existing cap and it sounds great and doesn't stick out at all which is what I want. I still need to take some measurements as I'm curious as to how the treble will measure now. The old Audax was definitely down 5db or more above 12Khz.
-Rod
Along with the JBL 2441's plus a 12 inch JBL 12 inch mid-bass driver which I do not recall the model number of.
Given my 'druthers, I pick a straight horn as you have for the mid bass with a REALLY nice JBL 14-15 incher doing the business.
The hand-crafted Cocobolo Wood veneer on these makes up for the lack of a straight horn I guess.
Well, the advantage of the folded horn is that it goes a bit lower and has a much smaller footprint. Mine have a 15" JBL D130s and they drop off like a rock a 80hz.
-Rod
But they do what they do, do well!
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