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In the Forum: Horn-Loaded Speakers
In the Thread: Macondo’s lowest channel.
Post Subject: ULF from the SledgeHammerPosted by oxric on: 10/27/2011
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I have also a fondness for this design which may well suit your room with the line sunk in your basement. It is interesting that this design makes use of two woofers in push-pull configuration as well as making use of a transmission line. The only transmission line I have had, an IMF RSPM reference put me off slightly, as although it had very low bass, it sounded bloated and muffled. Nonetheless this is a design that goes back many decades and I believe it must be possible to achieve better solutions nowadays, see the following for what looks like a promising attempt (I call it The SledgeHammer because of its shape):

http://www.teresaudio.com/haven/subs/subs.html

 Jorge wrote:
 

In that room we have 3 different bass solutons working toghether,  2 ten inch pro woofers per side from 140 hz down to fs cutoff (around 45 hz) sealed enclosures, and a pair of 15" servo controlled subwoofers one per side  taking it from 50 hz.  And well the tapped horns, that add a nice punch to it all.

The big problem with this setup is time aligning everything, or finding the correct phase for all the bass drivers: If something is not perfectly in sync,  the woofers start fighting each other and you get a real mess!  We found out once that by lowering the volume of one channel we got more bass output!!!  Something was clearly wrong!



Jorge, I wonder how you actually use the two ten inch woofers. Is it a push-pull configuration with one facing out and the other pointing inside the enclosure? So what frequency range do the tapped horns provide, and do they overlap with the 15" subs?

Best regards
Rakesh

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