A question on crosstalk

[sardonx]

Would the difference between an amp with say 78db crosstalk and another with 90db crosstalk be audiable at all?

[K-amps]

I'd say depends on the spectrum of noise.... but very little difference unless you have Klipschorns.

[sardonx]

thank you k-amps

[sardonx]

I mainly ask because my pre-amp has a crosstalk measurment of 105db. And the amp I want to get is a perfect match in all respects except it has a seperation of 78 - 85db. I don't want to degrade the sound in any noticable way.

[dnsey]

I wouldn't worry abt it.
There are many who consider that a little crosstalk is a good thing for imaging. It's used commercialy in the Frankenstein enhancer, which was generally well reviewed.
Some of the best imaging I've come across was from an old Armstrong tube amp with clearly audible crosstalk.

[sardonx]

thank you, dnsey.

sardonx

[Eva]

Listening rooms usually have only -1 dB or so crosstalk

Anyway, most crosstalk found in power amps is usually due to poor PSRR [or poor layout and/os ground loops] and this is a more important issue [poor crosstalk usually comes together with poor PSRR at midrange or trebble, and I'm not talking about rejecting 100Hz buzz but about rejecting the ripple the own power amplifier circuit creates on its power supply rails and/or the voltage drops it creates on its own circuit tracks]