GoodSoundClub - Romy the Cat's Audio Site

In the Forum: Horn-Loaded Speakers
In the Thread: Compression Drivers -in general

Post Subject: More notesPosted by serenechaos on: 10/20/2008

At first I plan to power the thing SET, with a known, existing amp (a triode wired EL84) which I've already built and know the Sound. It is not bad, but a little "warm" sounding (second harmonics, and is low powered for low frequencies.
Then I use a 304TL amp, (under construction, another known, a much cleaner sound, ~ 5 wpc).
After I get the horns built, and working, (play with crossover points, etc) build dedicated SETs for each channel.
I don't want to attack too many variables at once.

Since this thread is for compression drivers, I didn't go into detail on horns; but horns and amps information is necessary to talk about compression drivers...
The "65Hz Tractrix" is only part of the story; that's the flare rate.
It is truncated @ 68.9"; which would give a 3 1/2' mouth, or 30" x 60" if cut in half-moon shape, as Jeffery's installation was @ VSAC http://www.goodsoundclub.com/Forums/ShowPost.aspx?PostID=7467 . Only I plan to mount these mid-bass horns to the ceiling, which will necessitate reversing the order of the other horns as well. I spent quite a bit of time talking to Jeffery about it, running sims, then re-discussing it with him. As this is new to me, I thought I better ask someone who's done it before. I also discussed it with John Hasquin in depth several times. We not only discussed horn making, but he also approved the idea, and added ideas to change if it didn't work out at first.  It may not work, but I'm going to try it. If the fane doesn't have enough umph, I'll use something else, or make a driver that does.

The whole idea is to keep all the horns and drivers in about a 2 1/2 octave spread.
To keep everything in the middle of its most "comfortable" "resonate" operating frequency.
Not to force anything too high or too low.
The mid-hi and mid-low expansion rates and cut-offs are also designed to match directivity at the crossover point. (60 degrees @ 2kHz). Again verified by both the above.

Integration between all channels is one of the main things I'm trying to achieve.
I keep thinking of the Oswalds Mills installation @ RMAF.
It sounded like three very nice drivers, not one coherent speaker system.
I want everything to have the same "voice."
Robert

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