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Posted by Gregm on
02-16-2007
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 Dominic wrote: | Here's a threeway with the BMS coax like in your orpheans nested in what i think is a 80hz horn which is driven by 2x15"s
I'm not sure how well the time alignment works. I think the woofers are a bit too far back.
in any case: |
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That's what it looks like in the picture. OTOH, in trying to be "all coaxial" where else could they/anyone place the BMS if not in front of the mid/woof? So, it won't be mechanically time aligned and you have to apply some kind of delay: so, one might as well go the conventional route & separate the drivers vertically.
| it's just nice to see the energy range and the melody range coming from the same point source with horn loading. |
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Nicely put. I have been wondering about this on and off on more limited scale, however: how do I get say 150-200 -- ~8kHz from the same "point" in space?? Coaxial makes sense as does compression but the optimum operating range is too small.
Cabasse, for example, makes multiways coaxials: http://fr.forums.audiofanzine.com/apprendre/mailing_forums/index,idtopic,166995,forum,nouveau-hp-coaxial-cabasse-4-voies.html
But, further, you can see that while they get their axe OK (of course) there is a physical impossibility to get the alignment right from the start http://www.cabasse.com/french/2006/cabasse_2006.pdf (scroll to page 14)
so they use delay to line up the sound in their implementations. And, of course, one probably needs another tweet for over 12? 15?kHz to make the upper frequencies coherent (I'm speculating here).
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