GoodSoundClub - Romy the Cat's Audio Site

In the Forum: Horn-Loaded Speakers
In the Thread: Macondo’s lowest channel.

Post Subject: The size matersPosted by Romy the Cat on: 9/20/2010

Well, I figures that while I am not sure what to do with LF section and where to locate it I will live with my woofer tower from my old listening room. They did not work well as Lower-Upper-bass channel installed next to Macondo but in odd place, handling under 35Hz then might do OK.
I have 12 drivers, 6 per channel and it is lot of LF displacement. One 18” woofer has surface of 255 square inch. The 6 driver of 10” has aria of 468 square inch, or almost as 2x18 woofers. If I go mono (something that I do not want to do) them it will be 936 sq inch, or a bit less than 4 fill 18” woofers. This is a LOT of displacement and it will require lot of power. If I run it with a powerful SS amp with high gain (perhaps my B2 amp or similar) then I might have something.

The advantage of my woofer towers that they are already here and I need to spent zero efforts to make them to work. Also they use drivers with 19Hz resonance – good lock to find 18” driver with sub 25Hz resonance. The arrays did work femininely food in my old much smaller room but I never used then at dedicated lowest octave – this will be first for me to try it with those drivers. My concern is excursion. The Scan-Speak woofers are light and relatively low excursion. In my old room they did not move a lot and it was very good. My new room from bass perspective has over 1400 sq feet space and to pump 30Hz pressure at THAT volume would require a lot. I’m even afraid that my Yamaha B2’s power will not be enough and I would feel much more comfortable with a good 400-800W power amp.

Anyhow, I think to setup my Scan-Speak arrays with B2 would be a good thing to start… The key would be to find out how low my midbass horns go. If they go to 40Hz then the LF section would pick up at 35Hz-40Hz. If the cathedral ceiling would do the trick and the midbass would spread down to 30Hz (I think possible) then the LF section will pick up from 25Hz and this would be much more preferable configuration. Let see, I am a week away from starting all listening and measurement tests.

Rgs, Romy the Cat

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