Tweakers' Asylum Tweaks for systems, rooms and Do It Yourself (DIY) help. FAQ.

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Uncle Mike: don't bother reading the following

Posted by unclestu (D) on April 11, 2015 at 17:25:54

In Reply to: STU posted by Uncle Mike on April 11, 2015 at 16:31:11:

It will only upset you more, and that is NOT my intention.

A while back (12 -20 years ago) such a device was introduced by Japanese company called Enacom/harmonix. It made noticeable sonic impact.

I was quite surprised because you weren't supposed to hear such high frequencies anyway. But I asked around. Most designers I talked to simply shrugged their shoulders.

One designer, still currently active making and designing a full line of electronics, but probably more noted for his phono sections, pondered a few minutes and came up with the feedback hypothesis.

He noted that in his mathematical calculations, the Power supplies always drew a bit more than calculated. Not a lot, but always more. The bit about oscillation came from him because, as he pointed out, the more FR he could get out of his newer oscilloscopes, the better he was able to ID the offending RF. As he eliminated the sources of the RF, the warmth increased in his all transistorized designs, becoming a bit more like tube gear.

Subharmonics, he felt was the key, but removing the very high RF also
helped the lower frequencies as he could find nothing in the lower audio bandwidth.

I use a giga tweeter, operating in the megahertz range. Works well although I can hear absolutely nothing coming out of the piezo element (well most of the time, doesn't work on certain models).

Again , puzzled I asked around. Same guy remembered the cap and resistor thingy, and then suggested because the negative feedback which most amps employ it could enter and contaminate a circuit. Amps like the Spectral advertise an FR of basically 0 to light ( it seems).
He suggested that since you couldn't hear it any way, why not dissipate that RF energy into work pushing the piezo tweeter....

Of course YMMV and FWIW.

Edits: 04/11/15

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