New Electrical Circuit

@jea48 My electrical box is outside. Can they encase the (Southwire Armorlite 125-ft 10/2 Solid Aluminum MC (Metal Clad) Cable) inside metal conduit for the outside portion for weather proofing?

@puffbojie

My electrical box is outside. Can they encase the (Southwire Armorlite 125-ft 10/2 Solid Aluminum MC (Metal Clad) Cable) inside metal conduit for the outside portion for weather proofing?

Not really.

The electrician can use a, (example), EMT to AC/MC/FMC/NM Transition Fitting . He will remove the aluminum armor for the length of the EMT conduit and the wire needed for make up in the electrical panel.

Or he can use a junction box inside to transition from EMT conduit box connector to an MC cable box connector. I think the EMT to MC transition fitting would work better, jmho. Your electrician on the job site will know what will work best for him for his install situation.

If you decide to have MC cable installed make sure the electrician installs 3/8" anti-short bushings on all cut MC armor ends. Anti-short bushings are not required by NEC code. Have him install them anyway... They protect the insulation on the conductors from the sharp edge of the armor.

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Between (a) running 3 separate homeruns to the panel as mentioned above, and (b) a single homerun powering a subpanel in the listening room, which would you recommend?

@devinplombier

Not a simple question to answer. Best answer I can give is, It depends.

How long are the home runs? How many branch circuits will be installed? (You mentioned 3)

Cost of a good sub panel and feeder to feed the panel ain't cheap.

As for where the sub panel will be installed. I read occasionally where the panel is installed in close proximity to the wall outlets being fed. By close I mean less than 25ft of wire. Jmho that defeats one of the reasons for installing multiple dedicated branch circuits. To decouple audio equipment AC power supplies from one another. Not much impedance and inductance in 15 to 25ft length of wiring.

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OP

I ran a years long test using a bunch of high end receptacles, and came out with a few winners:

Furutech GTX-D(G gold) or GTX-D(R rhodium) depending on your tastes, Oyaide R-1 which has platinum and palladium coating)......these stood out amongst all others I tried. I am installing one each of these on 3 dedicated lines in my new listening room

If anyone is on a budget, the Acme Audio Labs at $60 are excellent....and great replacements for stock receptacles without breading the bank. Silver plated over higher copper content brass

@jea48 Regarding the 20 amp circuit, vs a 15 amp circuit, would you not need a 20 amp plug on the amp’s power cord for the unit to utilize the 20 amps? -and what if the amplifier only calls for 15? Would there still be a benefit? My understanding is when connecting the amplifier to a 20-amp circuit that the amplifier will draw only the current it requires.   I guess the question I am getting at is: should I use a 20 amp power cord/ “plug” for the amp to match up with my 20 amp circuit?