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The Man That Saved ~The Dead~&~The Who~&~Frampton~&~Walsh~


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GREAT article on a great innovator. Remember the Air-Motion Transformer speaker? Didn't Heil have something to do with that thing on top of the Ohm-Walsh speaker also?

But heres' one sidebar of the article that ALL EQ GEEKS must read. This is required. Do not skip it under penalty of death by feedback!

BOB DOES EQ

You have to have proper equalization. I always

liked parametric EQs because we could go in and change the parameters

of each filter besides just bass and treblewe can tell that bass and

treble which frequency of bass and treble we wanted it to be, what we

needed it to be. Thats why Im just in love with parametric EQ in

regards to monitors in general. Its real simple, but its such a

helpful tool. What I would do is I would always set the microphones up

where they needed to be, and bring it up very gently until feedback.

Right at the threshold I would let it go ahead AND RING. You know it

will get stable; it will actually sit there in a tone and when it

does you grab a hold of the notch filter of the parametric and, like

tuning a radio real slow, as you tune through the frequency . . . BINGO

. . . it will find THE frequency and the feedback will go away, and

thats exactly where the notch should be. Then you feather it out, and

then you are done. Why is this not done so much today? Why are we not

hearing people doing that? Did they forget? Hell, THIS IS SCIENCE. You

cant forget science. Some people today just dont understand. Lets

use a graphic EQ. Thats the worst thing that ever hit us, the damned

graphic EQ. Well, they draw pictures on it, and Im serious! I have so

many guys that call me for advice and say well, I got a smiley face on

it. What? Im furious at this point. I got a sad face; I think it

sounds better with the sad face. What the hell are you talking about?

Well my graphic EQ lets me draw a sad face or a happy face. Its so

sad, because no one has taught them; no one has showed them what the

real tool is. The tool is a parametric; where we can make any filter do

anything we want. It can be a boost, it can be a notch, it can be three

octaves wide, it can be a half-octave wide. How cool it is when you

learn how to do that? And its really so simple. I feel sorry for the

guys who dont know; the guys who dont understand. Youll ask these

guys do you know what the cut rate is? Oh yeah, yeah I know . . .

theyll tell you, because theyre embarrassed to tell you what they

dont know about EQ.

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TRIVIA...... Klipsch Cornwall loudspeaker system, a Paul Klipsch masterpiece which took a full 6 years to develop

You know me, the Cornwall King! got any more stories about it's development?

Bonus points will be given for any reproductions of Paul Klipsch hand-drawn design diagrams of the CW in development!

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Horn guy = Bob Heil

AMT guy = Oscar Heil

Bob used RCA Olson bins for low end (CTS 15s), JBL 4650s for low mids (CTS 15s), his own FG horns for upper mids (similar to Altec 511, Klipsch K5J, with EV 1823M), and dual tweeters in a parabolic array (EV T35).

Later on he made some 64hz dual 15s that were similar in size and performance to a stacked pair of LaScala. Then he made some dual 15 mids that resembled a stacked pair of just the horn section from the 4560s.

His amps were the old style Crown DC300 with one extra pair of outputs and a fan cooled sink.

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Oscar or Bob, all I know if I didn't own Klipsch, I would own a speaker system with the Air Motion transformer, I really liked them, ESS with AMT, they served me well, Sold them to a guy who somehow managed to blow out the Woofers, and replace them with woofers intended for car use, sounded awful, just to save a few dollars, Sorry I sold them to him, what a waste, yeah, him too.................

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