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In Reply to: RE: What the world needs is a good 10-12" LF driver for horns !! posted by Rafaro on February 03, 2016 at 11:57:20
When you increase throat area you lose sensitivity and increase ripple. An optimal horn for the LAB 12 has only 142 sq.cm. throat area. And as it would have 132dB maximum output to 22Hz I'd call that sufficient.
Follow Ups:
Hello Bill
When is "sufficient" enough for live sound?? For me, in live sound, speakers can never have too much output. When I noticed that a 1/2 wavelength sub woofer horn can put out up to 5 dB more than a similar 1/4 WL that was the end of 1/4 WL sub woofer horns for me. In my cab design it only meant adding two feet in depth but would require 4 or 5 of the 1/4 WL HORN cabs to match itīs output. (Please note that the output in subhorns increases about 5 dB when the freq reaches 1/2 WL). So excuse my compulsion for the ultimate efficiency it means less to carry but from a manufacturers point of view it also means less to sell.
Rafaro
Rafaro,
Let's do a "think back". Back in the day (late 60s to late 70s), it was cool to have a giant PA system, 'cause that was a badge of achievement. I'm talking about local/regional/national bands.
Then, someone got the idea that hauling a couple of truck-fulls of speakers (and setting them up), was stupid and a waste of money. Enter Meyer Sound. High output, high efficiency, low distortion. In 1980-81, I tried to promote Meyer Sound speakers. Could not sell 'em. They were expensive, and bands still wanted big over-sized P.A. systems, 'cause they were cheaper and cool.
:)
I have several Sonic Impact amps based on a Tripath chip. I took the amp to Klipsch headquarters in Indy and one of their engineers tested it. It put out 6 W/ch. with low distortion. He was impressed. Too bad Paul Klipsch didn't live long enough to see one. I certainly would have taken one to him in Hope when I was there in 1985 if it had even existed then.
It cost me 27 bucks and sounded really good. I put AA batteries in it, and plugged a Sony Walkman CD player into it and SOLD my 1977 Khorns with that demo in about 2 minutes. Blew the guy's mind, to put it mildly.
I still use one for curving drivers, since it's really portable and with a $20, 1A Radio Shack wall wart, it works great for that purpose.
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