2. amps-preamps
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distance from amplifier to preamplifier question?

I have a Lamm 2.2 mono hybrid solid state/tube amplifier. The manual says to keep the amplifier at least 3 feet from the preamplifier? Any reason for this? Would that also apply to a cd transport as well?

Michael

p.s. by the way has anyone noticed interference of any sort when their treo 650 phone or laptop pc with wireless internet is in the same room as their audio equipment?
karmapolice

Showing 2 responses by mikelavigne

mikelavigne
2,209 posts
 
EMI (electromagnetic interference)from the power supply of the amp can pollute the delicate signal path of the preamp.

this effect would vary from product to product depending on the design of the circut and level of shielding. EMI is not the only potential thing that needs to be considered but the main one regarding proximity. noise in your power grid and RF are likely the other 2 main electrical issues (and grounding).
mikelavigne
2,209 posts
 
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.
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