GoodSoundClub - Romy the Cat's Audio Site

In the Forum: Horn-Loaded Speakers
In the Thread: The tapped horns: cons, pros and Sound

Post Subject: The sub-subject. Terra Incognita of audio.Posted by Romy the Cat on: 4/12/2011

Josh, I think that you touched more complicated subject then you think. Let me to explain why I feel this way.

The fact that I advocate a dogmatic, religiously-stubborn, almost paranoid time alignment of the channels is not a secret. I do feel very comfortable with my time alignment paranoia and I have no need to debate or defend it. So, far any single installation that I heard, including mine, was benefited by time alignment. The people who visit me and question the time-alignment subject I usually do very short demonstration by taking one of channels out of alignment and explaining to them what specifically they need to pay attention while they are listening. Uselessly there is not more question after then.

The time alignment in bass is of cause is less critical but if to know what specifically to listen then I need to report that I have no problems to recognize the sonic difference when my woofer woofers towers are moved for a 6 inchers away. I do not insist that the change is due to the time alignment, it is very much that it just room modes act differently. Still, the most proper condensing of leading edge of bass pressure ways I get when my woofers towers are aligned with my upper bass? A coincidence? Perhaps, I do not know bay what is the differences. I care about right position of woofers towers in the room and it happened to be where it happened to be. We have very little control over it anyhow….
So, way do I feel that it is “mode complicated subject”? Because there is in it a sub-subject about witch I’ve been thinking for a while and I did not come a comfortable answer. The sub-subject is the time- alignment for ULF region.

The ULD is sub-auditable bass and in addition to “pressurize” the “nervousness” of the room it prolongs the reverberation time in the room. The extension of reverberation time in the room is not something that needs to be time-aligned. It needs to be delayed: the lower frequency the longer delay. We can’t do it by our real-time, analog signal processing methods, so what can we do only to set out ULF to be delay for a fixed time with respect to the size and a few other conditions of our rooms. This setting is very “strategic” and it shall be very interesting to play with it. From one side you would like to synchronize the “nervousness” of the room with your music but from other side you want the “nervousness” precede the auditable event, letting your guts to be “pre-cooked”. This is a very interesting and a bit complex subject that I am look forward to explore when I have back my ULF channels.

Now, remind you that I have not proper ULF as my ULF goes too high in might estimation. I might change it in future but in context of this thread I think to tray a pair of Tapped Horns of 12Hz-22 Hz would be more interesting. That would be true ULF and I would be able to run the delays without affecting the auditable range and compromising my Midbass. I wish I know how Tapped Horns sound and how far their sound subjectively from ported ULF enclosures.

Funny but I do not even know if the ported ULF enclosures are not useable for ULF. The ULF is very much a dark side of moon in audio and unfortunately it is costly to explore and serve relatively diminutive result.

The caT

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