the horn dimensions, for somthing like this?
http://img151.imageshack.us/img151/1258/mr90216hfb.jpg
http://img151.imageshack.us/img151/3420/mr90216hfc.jpg
http://img151.imageshack.us/img151/7535/mr90216hf.jpg
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the horn dimensions, for somthing like this?
http://img151.imageshack.us/img151/1258/mr90216hfb.jpg
http://img151.imageshack.us/img151/3420/mr90216hfc.jpg
http://img151.imageshack.us/img151/7535/mr90216hf.jpg
The location of my loose ones eludes me, or I'd measure them. The one dimension I do remember is the shocker though, the throat opening is ~7/8".
I have a theory...:cool:
FWIW, my SWAG is that the molding includes a reverse tapered adapter which does double duty to pre-load the WG that in turn will create a notch at the adapter's 3rd harmonic around 1 WL of its length and I imagine they designed this system combined with the supplied hi-pass cap to be the acoustic part of an acoustic 2nd order XO.
Or do I give them too much credit and it's just another 'make do' mis-mash of existing parts?
GM
Dunno, that sounds reasonable though.
My 'theory' reverts to MantaRay tech that uses a diffraction slot to fully "illuminate" the WG at HF on the big MRs. On the mini-MR, lacking the length for a slot, maybe the short, reduced throat serves that duty?
Then again, it seems I read one of the preliminary 90x sheets once that listed a 7/8" exit. I never had any of the MR 16HF drivers to check that, only the horns.
Added:
The molded "adaptor" is ~1/4" long, and 7/8" round to 7/8" square in that length. With it removed, the body throat is still 7/8" square. Only way to get 1" is to shorten the horn, so the entire assembly appears to have been designed around the 7/8" dimension.
Well, don't I feel like the dumba$$. :o All 900 series are 7/8" exit and if I ever noticed it I'd clean forgot I guess since I only was exposed to a few pairs others bought. Mostly I remember how they didn't load 511/500 Hz XOs very well due to their BW being shifted up to get less horn honk and more highs with SS amps. The smaller throat certainly explains a lot about how they achieved it.
http://www.lansingheritage.org/image...pro/page05.jpg
GM
There's that sheet! Was thinking my thinker had thought bad thunks fer a minute...;)
Not all 900s are 7/8" though, my 909s are 1" and the 909 sheet backs it up.
Sooo... the horn merely fit the driver it was made for, no mystery. Begs the Q of the MR-equipped 604s internal WG dims though...(and if later/current production 900s are 7/8" or 1")
Tom, the spec sheet lists the MR horn at 6-5/8"W x 4-9/16"H x 4-5/16D.
Yeah, I was coming back to edit that as the more I thought about it, I remembered the 909 for sure was 1", but came out about the time I had the accident, so the '84 catalog's blanket statement wouldn't have included it. Oh well, write it off as just another 'senior moment'. :(
GM
There goes bfish again... dadgum worm can opener... :DQuote:
Originally Posted by bfish
thanks ...Quote:
Originally Posted by bfish