Turntable Hiss

Hi Katie,

It's possible that better cables will help somewhat, but my guess is that the main reason for the hiss you are hearing is the 540P phono stage, and unfortunately I suspect that the only way to substantially reduce the hiss is to substitute a better (and more expensive) phono stage.

What primarily determines the hiss level is the relation between cartridge output voltage and the levels of electrical noise that are generated in the phono stage's input circuits (since any noise generated there is amplified by everything that follows). Your cartridge is rated as having a 5mv output under standard test conditions, which is quite high, while the phono stage gain (which tends to loosely correlate with noise performance) is not particularly high at 39db. And a phono stage costing around $100 figures to have marginal noise performance.

Having to set the volume higher for phono than for other sources is typical and to be expected, though, because cd and tuner outputs are usually higher than outputs of phono stage/cartridge combinations. With a better phono stage, though, you would get less hiss at that higher volume control setting.

Perhaps someone else having specific experience with the 540P will comment further.

Regards,
-- Al

It makes more sense to find a cartridge to match the preamp.

Ron -- Note that she already has a 5mv cartridge. No moving magnet or moving iron cartridge, to my knowledge, is going to provide a great deal more output than that. I believe there are some cartridges that approach 7mv, but that is less than 3db greater.

So if the root cause of the problem, as I suspect, is the level of noise generated by the phono stage, changing cartridges will not improve signal-to-noise ratio, and therefore will not help significantly.

Regards,
-- Al