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RE: 6SL7 Ratings

Hi,

> As much as I respect you I have to disagree.
>
> 1) The higher the frequency the more our ears
> are sensitive to phase deviation.

The sensitivity of the human hearing towards phase deviation broadly parallels the ears overall sensitivity. General hearing acuity at very high frequencies is incredibly poor, due to the fundamental mechanics and "electronics" of the process.

I do not advise adding tons of extra phaseshift to an audio system, at the same time I refuse to be worried about 10 or 20 or even 30 Degrees at 20KHz, simply because I know the phase response of Microphones, Speakers and other devices. We are talking about very few percent added to the overall accumulated phase error.

> 2) If we pile on phase/response deviation because
> "well the speakers aren't perfect" then why
> are we trying to get HiFi sound at all.

If the speakers phase-error is 10 to 30 times that of the amplifier allow me to be somewhat blase' about the magnitude of the effect. I'd worry about other stuff than phase first.

In fact, if you listen to any Vinyl or analogue produced recordings on CD you should give up any hope that anything can sound good at all, given the phase-errors in these.

> 3) I can't stand metal domes because
> the ~25KHz ringing gives me a headache
> so my HF sensitivity is better than most.

Mine is not as good as it used to be, but pretty good.

I'm still trying to make mind up if the problems from ultrasonic resonances (yes, I observe these too - surprisingly few people do BTW) are down to bone-conduction or intermodulation in the non-linear air in ear-channel.

So, I agree that all else a higher f3 would be nice to have, but at the same I do not suggest anyone looses sleep, there are bigger fish to fry first.

Ciao T

PS, you did not comment on just how much phase-shift my rather idealised speaker would exhibit, nor on how much real speakers have.
Thor

At 20 bits, you are on the verge of dynamic range covering fly-farts-at-20-feet to intolerable pain. Really, what more could we need?

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