I'm probably late in the game on this discussion. Agreed that direct line is better than daisy-chain through a bunch of low end crappy outlets. Another thing to remember is that anything larger than 10awg is going to be stranded wire. In my experience, solid core just works and sounds better than anything stranded. Granted, the A/C in-wall line may not have as much influence to the sound as the final outlet and power cord, but every little bit helps.
I would use the cryo-treated 10awg Romex from VH Audio (or Audio Sensibility in Canada).
You can always look at the Oyaide EE/FS 2.6 wire. It is 10awg solid-core OCC copper conductors, which will be much better than the standard Romex, but it's going to be extremely expensive at about $130 per meter. It carries CE/JIS certification, but I would check with your local electricians and inspectors. Local inspectors can get weird with what they will accept or decline (even though technically it's okay). Local inspector will approve Romex all day long, but something different like this may be rejected. The Oyaide is going to be stiffer and less flexible then even Romex and will require a larger curve radius when bending.
I would use the cryo-treated 10awg Romex from VH Audio (or Audio Sensibility in Canada).
You can always look at the Oyaide EE/FS 2.6 wire. It is 10awg solid-core OCC copper conductors, which will be much better than the standard Romex, but it's going to be extremely expensive at about $130 per meter. It carries CE/JIS certification, but I would check with your local electricians and inspectors. Local inspectors can get weird with what they will accept or decline (even though technically it's okay). Local inspector will approve Romex all day long, but something different like this may be rejected. The Oyaide is going to be stiffer and less flexible then even Romex and will require a larger curve radius when bending.