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Hybrid 4pi midhorn [message #51885]

Sat, 08 March 2008 13:59

rick
Messages: 53
Registered: May 2009

Baron

Well I've used the theater 4 pi for some years now and it's a gem, a real gem. But now see, I got that itch, a kind of knawing and wondering about the mid horn. What would it do to tickle my auditory nerve. Would voices and some instruments seem more profound and titillating? I'd want to do this up too. Jbl 2226 and 2012 if it could be had, does it exist anymore in this country? I can't even find it on ebay, (and I've had a serch on it for months). And b&c 250 for the top end. I'm ranting cause I got that itch. Would anyone whom are using the mid horn care to fuel my knawing and craving by exorting the many fine atributes of said device? Thanks.
Rick

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Re: Hybrid 4pi midhorn [message #51887 is a reply to message #51885]

Sun, 09 March 2008 01:36

Wayne Parham
Messages: 18737
Registered: January 2001

Illuminati (33rd Degree)

That's a good way to go if you can't put your speakers in corners. Use the four π for a bass bin but don't cut the hole for the tweeter. Put the midhorn on top of it and the tweeter on top of that. Use the seven π crossover.

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Re: Hybrid 4pi midhorn [message #51889 is a reply to message #51887]

Sun, 09 March 2008 15:07

rick
Messages: 53
Registered: May 2009

Baron

Actually I'd like to build a whole new system. Bass bin, midhorn and tweeter, and I'm considering regular crossover and biamp choice for the bass bin to upper stages. I would like to be able to use both of my amplifier systems, an old hafler 100w for below and tube mono,s for above. Would a conventional 24 db electronic crossover be compatable with what the design of the regular crossover intended? That is, the rate of slope to attenuation is not "the" crucial factor for a smooth transition to the midhorn? I seem to remember equal summation for the two drivers. Also I guess the jbl 2012h is a rare find to be had as I meantioned prior. Funny, I see it still for sale on foreign pro audio websites.
Rick

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Re: Hybrid 4pi midhorn [message #51892 is a reply to message #51889]

Sun, 09 March 2008 23:40

Wayne Parham
Messages: 18737
Registered: January 2001

Illuminati (33rd Degree)

Biamping is definitely an improvement, but you'll want to maintain the same slopes. The woofer and midhorn are acoustically close so summing is best with a low-order crossover. Midhorn/tweeter is a little tighter and you'll want third-order on the tweeter with equalization as shown below. The midhorn electrical slope is only first-order, which combines with an acoustic second-order slope.

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Re: Hybrid 4pi midhorn [message #51931 is a reply to message #51892]

Fri, 21 March 2008 23:15

rick
Messages: 53
Registered: May 2009

Baron

Thanks Wayne, so a low order slope for the jbl 2226 to the midrange horn, is that a 1st order slope? Also to use the b&c 250 tweeter, would the compensation network remain the same as that used on the eminence 2002 but padded down with more resistence for its higher sensitivity?
Rick

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