That's one handsome case, and the plexiglass top is such a cool idea to admire your handiwork! Do you have any concerns regarding thermal issues? I mean, should the top have a few "breather" holes to help rising heat escape? Or are all these modules so efficient that not much heat is expected?
So one of your goals is to reduce or eliminate power supply noise-coupling onto the unbalanced RCA cables? From earlier in the thread, I understand current requirements to be minimal, so resultant magnetic fields should not be that strong. Also, shielded, twisted pair shoul make short work of both RFI and EMI. But if still concerned, you might want to consider one or more of the steps below (Ref:
The 13-Step EMI Mitigation Program for Switching Power Supplies).
- Use an EMF meter ($35) to determine the orientation and strength of the interfering field then...
- Wire the supply to minimize loop area (formed by power line and its return path)
- Include bypass caps between supply lines
- Add local decoupling caps at each power supply load
- Use a magnetic shield around the supply and/or wiring.
Is there a special reason you're interested in silver wire for the horns? I'm under the impression that silver cables do not have a signature "sound" as many audiophiles claim, and that using silver-plated wire to mitigate "skin effect" is ineffective at audio frequencies. Something else to consider: some maintain that wire should be the same throughout the signal chain, so what's outside your chassis should match the insides. The idea is that the more similar metals in the chain (include connectors and physical connections), the better the effect on sound.
