Rane, a U.S. pro audio gear manufacturer with a very solid reputation for
conservative technology claims that some of their gear (like mic preamps)
showed a SNR advantage when the power transformer was moved out of the box
and into a big plastic wart on the power cord.

http://www.rane.com/rap.html

Reasons to use external pwoer supples:

"Better Audio Performance. Removes the hum source, i.e. the AC line
transformer and all primary circuits resulting in quieter noise performance,
without the usual (and annoying) 50/60 Hz and 150/180 Hz hum components."


More bollockx.

**** poor design then, if their having those problems.

This "wall-wart" caper is more to do with complying with different regs
in different markets.....
--
Tony Sayer