distance from amplifier to preamplifier question?

I agree with Mike Lavigne, magnetic interference from the power supply of the amp can harm the preamps performance. That's why Lamm asks for separation between the two.

On the Treo 650, I have that same phone and the interference is caused by it operating on the GSM network.

My wife's Samsung and son's Motorola RAZR phones do the same thing because they too are GSM phones. Anytime these phones "check in" with the network (ours is Cingular) everything near them gets the raspy noise through the speakers.

This includes our AM-FM desktop radio, all four of our hard wired AT&T land line telephones, my stereo system (listed here), the FM car radio in my truck, my Macintosh computers sound system and my sons Windows based computer sound system.

I know that FCC regulations state electronic device may not interfere with other products, but this appears to be the exception. Perhaps GSM phones are exempt or were not held to the same standard as other devices.

Ditto to the comments made by Albert and MIke

Having said that however I have a Lamm ML 2.1 monos used with an ARC Ref3 which sits no more than 2 feet away from the left channel Lamm ML 2.1. It has been in this position for the past one year. Perhaps I am fortunate and/or have taken appropriate steps in grounding as I have absolutely no degradation of signal or EMI/RFI in the output.

Bob,

it's likely not the output signal from the pre (which the amp is then dealing with) that is the issue. it is more likely the power supply of the preamp is affected by the EMI from the amp's power supply. this EMI would cause noise in the preamp which then gets added to the signal path.

the power supply from the amp does not pollute itself.....or at least no more than it is designed to.

just a SWAG based on my personal experience.

maybe an EE or Phd in Physics can shed light on theory here to explain it from a factual perspective.

Mike

again I agree with you...regardless of this, I have absolutely no noise in my signal path and (as stated) my preamp is less than 2 feet from my left channel amp.