Dedicated 20 Amp Line for Audio

A dedicated 20 amp line will be able to supply about 2400 watts.

I am assuming you are using the appropriate cable for your 20 amp outlet (12 awg romex is more than enough).

You SHOULD connect EVERYTHING to it without hesitation.

Contrary to popular advice of spreading your devices to multiple outlets, connecting ALL devices to a SINGLE outlet will give you additional benefit of minimizing or completely eliminating ground loops.

You have nothing to worry about.... unless you intend to connect a welding machine to the same outlet too :-)

cakyol - simply stated, thank you.

I have 1 30 amp circuit for components and a 20 amp for subwoofer. Seems to work fine.

14awg is the MINIMUM you can do for a 15A circuit.  If it's a long run, then 12awg is recommended.  That is based on electrical code requirements. 

However, there is a definite difference in current capability between 14awg and 12awg romex, even on low current source components.  I've tested this in my room when I tried 14awg romex to my preamp/processor.  It just did not sound as open and the sound did not hit with as much authority as when I did a 10awg romex. 

You can use 8awg, but you are only going to get stranded wire and you will need to run this in conduit (per electrical codes).  Only romex can be run bare through walls and in ceiling/attic.  I would rather have solid-core 10awg or 12awg romex than stranded 8awg (but there are others with different opinions).

auxinput - thank you. I am kind of narrowing this all down with the help of you and the others that have so kindly posted here!