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07-16-2021 Post does not mapped to Knowledge Tree
Romy the Cat

Boston, MA
Posts 10,051
Joined on 05-28-2004

Post #: 1
Post ID: 26193
Reply to: 26193
ULF: where is the borderline....?
You have a nice very much full-range, preferably multichannel, playback system, and you like what it does. Now, disconnect your very lowest channel. Disconnect it and get use to this sound. Then put the lowest channel back to rotation. You got better sound all together. However, admit to yourself that “something” got worse. How do you deal with it?

"I wish I could score everything for horns." - Richard Wagner. "Our writing equipment takes part in the forming of our thoughts." - Friedrich Nietzsche
07-16-2021 Post does not mapped to Knowledge Tree
Paul S
San Diego, California, USA
Posts 2,576
Joined on 10-12-2006

Post #: 2
Post ID: 26196
Reply to: 26193
ULF Issues, or ???
Romy, is this a trick question? You are the only person I know of with time aligned, true IB ULF channels using 4 Aurasound sub-woofers, so who's going to answer your question?  The first thought that came to my mind was how some "Big Music" composers let some musical lines be "carried on the ULF", like the ULF is buoying it along. I have observed that not having proper ULF slights this effect. But I don't have effective ULF in the first place to know what problems it causes. I know that one "needs" a balance of HF and LF; but you also have the spectacular RAAL ribbons...? One thing is to be sure perceived problems do not inhere in the recording. Of course, "phase" is always an issue at ULF...

Best regards,
Paul S
07-17-2021 Post does not mapped to Knowledge Tree
Paul S
San Diego, California, USA
Posts 2,576
Joined on 10-12-2006

Post #: 3
Post ID: 26199
Reply to: 26196
I forget if you started out by setting the phase and level(s) of your ULF with DSP to begin with. Not to cave in to herd mentality, but it might be "worth it" to rent a DSP/D (servo) amp(s) combo to play with. If nothing else, that amp has to modulate something like 2 1/2 pounds per channel (driver mms), not to mention dealing with the back EMF from something like 60 lbs. of magnets!

Paul S
07-23-2021 Post does not mapped to Knowledge Tree

Posts 440
Joined on 07-05-2012

Post #: 4
Post ID: 26209
Reply to: 26193
ULF in any reasonable living space is subject to the Schröder frequency of that room
The frequency where your room turns into a pressure chamber changes the way that we perceive bass. This is how we get "bass" in a too small space like an automobile. When removing the ULF channel, all of the music is transmitted in a natural way for our ears to process. Adding the ULF channel back usually shows the hard knee of the switch between radiation and pressurization. Wavelengths too long for the space fold back.
How I deal with it? Open doors, windows etc until I get used to it again.

Whenever I feel blue, I start breathing again.
08-02-2021 Post does not mapped to Knowledge Tree

Chicago, IL
Posts 177
Joined on 06-12-2009

Post #: 5
Post ID: 26225
Reply to: 26193
I would try reducing the level of lowest channel or only play left or right side (if stereo ULF). Then run your experiment again.
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