11-13-08: Thegoldenear
STAY AWAY FROM THE 640P PLEASE!!!
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Thanks for your suggestions and I did purchase the 640p and the p must stand for Piece. The build quality is terrible and had nothing but hum after i hooked it up.
The occasional bad unit in any product line is inevitable. That doesn't mean that your one experience makes the whole product line categorically bad.
There are many, many satisfied customers--and reviewers--of the Cambridge 640P. According to the review I read at TNT, as well as my own experience, the 640P is exceptionally quiet, especially for the money.
If you heard lots of hum, there was probably a bad solder joint or a broken wire.
I've been using a 640P for nearly 7 months. It's dead quiet, not to mention dynamic, detailed, fast, extended, rhythmic, and tuneful.