Adapting old UPS for amplifier case, need help with some basics

[vann]

I wasn't sure whether or not to post this in the "Construction Tips" subforum, however since I can't find even a single post on amplifier cases/housings I thought here is a better place to ask.

I'm adapting an old APC UPS box to serve as amplifier case and house my 41Hz AMP9-PS. Space is little cramped with the AC transformer and the amp's board being fairly close. If possible I'll even try to fit my GrubDAC later.
Thing is, with space being a little bit cramped and all, how worried should I be about noise/interference from mains and the AC transformer, both being so close to the amp's board and the signal's path. Should I try to shield the mains and the AC transformer from the amp and the signal wires?

Also, I have few extra pairs of RCA jack connectors... I know they are best used for the inputs, but can also I use this kind of connectors for speaker outputs?
The output power should practically never exceed ~20W per channel, as the the amp will power a pair of Fostex FE207E and a pair of Tang Band W4-930SF.

Another thing is, I plan to use Cat5 or Cat6 ethernet cable (full copper) for connecting the speakers to the amp (as suggested in Full Range forum here). Can/should I use the same for inside wiring? (amp to connectors etc)


And please excuse my ignorance, my knowledge on this subject is very low.

[zerokelvin99]

I have never personally had a problem with a transformer, however, if you are worried then it would be good practice to put aluminium sheet between the transformer and the rest of the circuitry. :-)

[vann]

Tnx, will aluminium sheet suffice?

I half remember something about materials being able to magnetize, being best shielding options... not sure though, just something I think I've hear about...

[stratus46]

Originally Posted by vann

Tnx, will aluminium sheet suffice?

I half remember something about materials being able to magnetize, being best shielding options... not sure though, just something I think I've hear about...

Aluminum will shield electrostatic field but won't do diddly for magnetic shielding. For that it should be steel or better yet, Mu metal.

G²

[vann]

Most of the work is done, next is to shield the trasformer and find a way to integrate the DAC PCB & USB input.




Amp9_01 by vanlok, on Flickr



Amp9_02 by vanlok, on Flickr



Amp9_03 by vanlok, on Flickr



Amp9_04 by vanlok, on Flickr



Amp9_05 by vanlok, on Flickr