GoodSoundClub - Romy the Cat's Audio Site

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

Post Subject: The ULF amp Itch.Posted by Romy the Cat on: 3/7/2012

Nope, I do not have the itch with ULF sound but I do have a mild itch with ULF concept. The itch is not strong enough to make me to do something but I would like another day to push the boundary of reality and to see what in behind the rabbit hole. Let me to explain.

I have very good bass and ULF and everything else at the bottom. If I have any strong objection then I would make me to do something but I do not have any objections and this prevents me from look into the subject further. Still, I do have a desirer to see how ULF would be different if it was driven by different means. I drive my ULF by SS A/B amp. It is fully DC coupled amp with very good bass and if you remember when I use is with line level passive filer I complained that I did not like the bass. I do not know if it is my power amps is particularly shitty of anything else but the excuse that I use is that SS can’t produce good bass anyhow. At least I never was able to hear any good bass from SS.

So, if you remember I put a two stage tube capacitance-coupled crossover before my SS power amp and claimed that I got the bass that I was looking. I well understand that I in a way injected into the signal the 2 order harmonic distortion from tubes but whatever I found the result was fine. Now, from purely conceptual and non-compromise point of view of cause the ULF has to be driven by tube amp. With my room I need approximately 150-200W of SS power. To get the same damping of my woofer towers with ultra low out impedance from tubes I would need to burn a LOT of power in transformer, so I guess I would need 400W of tube power. To have a gaped DSET OPT transformer that will care 400W down to 5Hz let say it will be a monster with core of barrel size to build up inductance. I am not talking about the output tube that would be a high voltage monster….

I am well informed about the insane price and effort to put two of those monoblocks together and I will not do it, in particularly knowing that my ULF kicks at 20Hz. Still, I would LOVE to hear it and to make a judgment it make any auditable difference… I know that it will be no commercially available to borrow from somebody DSET for ULF, so it is possible that the question will never have an answer. Still, I would love to…

The Cat

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