Over loading?

jea;  I never, tripped the breaker, just don't want to put a strain on my amps.  Like I wrote earlier, is that there’s 12/2 romex to a 15 amp rec. which is fine. I’m sure I can still change the breaker to 20 amps with 12/2, which should be code, & leave the 15 amp rec.. This is for my AV, I don’t think I use 1/4 of the max of power when watching a movie. Now when listening to music, sometimes I just jam. Different system. Thanks for you response!

Guys don’t forget to figure branch circuit wiring VD (Voltage Drop).

Example:
For a 60ft branch circuit using #14awg cu wire during short peaks of 12 amps current draw.

Voltage drop: 3.85
Voltage drop percentage: 3.21%
Voltage at the end: 116.15

15 amps.

Voltage drop: 4.81
Voltage drop percentage: 4.01%
Voltage at the end: 115.19

https://www.calculator.net/voltage-drop-calculator.html?necmaterial=copper&necwiresize=0&nec...

FWIW a 15 amp breaker will pass short quick draws of current well over the 15 amp handle rating all day long with out tripping. VD will be proportional to the length of the branch circuit wiring and the higher current draw on the circuit.

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Seems odd to me that there is a 15 amp breaker on 12/2 wiring. I would check that the entire circuit is wired in 12/2. 

I (personally) ran 8/3 from my main, on a 60 amp breaker at a length of 20’ to my subpanel. Now, if the 12/2 from the subpanel to the outlets are nor more then 3’ per outlet x3. This is why I’m asking; I don’t want to harm my amps.

Mark, why is it weird, 12g wire is fine for 15 amps. When doing lighting, 14 is code, outlets get 12g. If you read the entire post, I wanted to segregate my tube amp & power conditioner, which now share a 15amp socket & breaker.

I've seen this before where a 15 circuit had a mix of 14 ga and 12 ga wiring. It was just a caution to you to check as a 20 amp breaker would not be a good idea in this case.