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In Reply to: RE: Altec 604-8G versus Tannoy 15" Golds posted by djk on August 12, 2007 at 02:18:16
Hi djk
Did PPSL look like MTL2?
Did you use Eminence 15"s?
Harmonic distortion looks relatively low.
Did the thermal patents do anything?
Mike.e
Follow Ups:
"Did PPSL look like MTL2?"
Not much. The EVs are not PP, and there are two seperate enclosures, mine share a common back volume. My form factor was 36" wide vs the EV being 22.5", same basic size, but easier stacking.
"Did you use Eminence 15"s?"
You can use any woofer that is quiet from the back side, I use mostly Eminence.
"Harmonic distortion looks relatively low."
I don't consider in excess of 3% at 60hz as being particularly low. It will drop by and order of magnitude in push-pull.
"Did the thermal patents do anything?"
The extended pole helps with heat, and the teflon on the poles reduces arcing when the coil expands with heat. Having said that, I don't generally use EV woofers (except 12s for horn loaded mids).
Hi
Ah more like this?[image]
The open chamber is tuned (read your other post)- Olsons book has the equation for this from memory?
-Not liking the bulk of pipey 0.5pi horn,considering DTS-20 inspired tapped horn(diyaudio.com thread)- but strange 2metre long shape harder to transport.
Regards
Mike.e
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