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Jeffrey Jackson wrote:

so, my straight horns... I like them very much.. I built mine similar in style to what Greg B linked, but obviously much smaller.. mine are just under eight feet long (length of a sheet of plywood) and have a mouth roughly three feet by four feet each.. throat is nine inches by nine inches.. I used the ubiquitous EVM-12l as it's specs were just perfect for such a horn.. I have quite a few other drivers that I wish I would ever get to trying.. some nice field coil units. :^) I LOVE the sound.. it does fall a bit short of what I wanted in the 200 to 300 Hz range, but I suspect that is the woofer.. I did have to add quite a bit of 1/4" all thread rod as bracing across the panels.. it worked very well... I also had to resize the back chamber (sealed) quite a few times to get the resonance down to the proper frequency.. it made a huge differerence...

Anything like this? :-)

Jeffrey Jackson wrote:

The reason I think the driver is the weak point is because as a proof of concept I built a seven foot extension to them to try a JBL 2" exit compression driver - the alnico monster 2482... it sounded wonderful in the lower mids, but my initial throat expansion wasn't stiff enough and that came through in the blunting of bass transients in the 80 Hz area.. long horns have to be very stiff... it played quite flat down to 50, however...

I also experimented with the “LF capable” compression drivers: they are dead in midbass.  The best of them remind me the “sound” of a person who after withholding his breathe for 2 minutes is trying to count loudly from 1 to 50 without gasping any air… Try it and pay attention to your “tone”.  :-)

There are no compression drivers in existence that can handle midbass and when we do use the currently existing park of the compressions drivers trying to squeeze midbass out of them then result is always repulsive. If people do clamed that they like the compression drivers result in midbass then I think that the only wishful thinking drives them instated of objectivism…

In any rate: I have written that a driver should be able to handle painlessly at least one two octaves below the mouth rate, although the frequency below the ½ of mouth rate should not be supplied to the driver… Looking at this I’m kind of a proponent of using the regular cone drives, using them with smaller throat and damp the drivers with the back chamber, somewhere at the point when the mouth rate will be nearby to the resonant frequency….

There is a driver from GOTO/ALE, witch is LF compression driver, 110 pounds or so and many-many thousands dollars. Probably 80% of them does to the block sucking distributes and resellers… I do not know how they sound but I would not take them too seriously. The GOTO/ALE use very crappy horns at LF, not to mention that they try to write the lower octaves with their horn installations and I do not believe into the sub 40-50Hz bass horns.

Also, Rich with his friend Steve are trying to build some kind of LF compression driver. Their idea sounds noble but I do not know if they end up with interesting result. I have seen that they booked a demo room in CES that makes me quite suspicion in their entire venture: if the driver as they propose will be built then in order to perform properly it would demand a large horn that…. if this horn be built properly then it will not have any commercial value.  To bring a pair of 10 feet long, 20-25 sq feet moth horns in Vegas, install them in a reasonable room properly and to setup an fine installation around then is a superbly complicated task, not to mention that this venture would cost ~$30K. Rich and Steve would not be so heavily vested into the project, not to mention that the venture itself will be financially unreasonable if they think to make money on it. The best that they might do publicly would be to demonstrate some kind of half-ass, severally-compromised solution, the same as Bruce dose and pretty much anyone else…. Sad but true: the rules of engagement into this idiotic industry completely eliminates any possibility of introduction anything really interesting via the industry….

Rgs,
Romy the caT

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