Mono blocks on different phases of the sub panel?

I agree with dedicated lines, but disagree with splitting the amps on two phases from the panel.

I prefer the "high" side of my 240 Volt drop for all four amps. The high side meaning one phase measures 122 volts and the other 119 volts. The 122 runs everything in the stereo and the 119 supplies the refrigerator and all other noisy items in the home that might operate when listening to music.

If your panel is being rewired by an electrician it's fairly easy to do.

Thanks Albert. I'm building a new sound room with a dedicated sub panel. My plan was to run the video stuff on one phase and the audio on the other. I think I'll stick with that. I just read that article and it got me thinking. What panel/breakers/bus bars did you use with your system?

When I did my room, I had the electrician put all the audio lines on the same phase leg opposite the leg running the appliances and HVAC system. While he was rewiring the panel, he moved anything that might induce noise (Lighting on dimmers in the audio room and other rooms, fans, washer, dryer, hot tub)to the phase leg opposite audio if it was not already set up that way.

Looks like you, Slipnot1 and I all have the same idea.

As for panel, I went with the Square D that uses bolt in breakers (as opposed to snap in) and it has copper bussbars.

Let us know how you do with it.

Ditto Albert! I have the Square D w/bolt ins as well. I neglected to say that all four lines are pulled to Porter Ports on bright orange 10 gauge.

I also agree that any audio equipment that is connected together by ICs should be fed from the same Line, leg, of the electrical panel.

I do respectfully disagree with moving all induction motor loads to the other Line of the panel. This can cause an more than normal unbalanced load on the electrical panel, the service wire feeding the the panel, and the load on the utility power transformer. By having all the induction loads on the same leg this can lead to over heating of the main Ac power electrical system.

I would suggest balancing the motor loads evenly across both legs as close as possible. Also I would suggest keeping the branch circuit breakers for the audio equipment a few spaces away from the motor load branch circuit breakers.

Here you will find how a typical utility transformer works. Notice for a 3 wire single phase electrical service only the unbalanced load, (amps), returns on the neutral conductor back to the source. The remaining balanced loads are in series. What that means is some of the flow of current traveling though the motor loads is also traveling through the audio equipment power transformer's primary windings.

Jea48's advice is similar to that of the electrician who installed my dedicated box and lines. He said that in installations when there was not enough balance between the loads on the phases it could affect television pictures, among other things. My monoblock amps are on opposite legs, as a result; I've considered changing it at some point, but haven't been dissatisfied with the sound so have not tried it yet.

My monoblock amps are on opposite legs, as a result; I've considered changing it at some point, but haven't been dissatisfied with the sound so have not tried it yet.
Rcprince

If it sounds good to you that way, that's all that matters.

I believe one of the reasons for audio equipment, that are connected together by ics, should be fed from the same leg is because of hum or noise caused from leakage of the power transformers. Kind of like having the correct ac polarity of the primary winding of the power transformer. Is the leakage voltage cumulative, measured between the two amps, if the two amps are fed from opposite legs , not sure.....

With the two mono amps fed from opposite legs of the electrical panel it would appear to me if the leakage was such a higher hum/noise could be more present, than if the amps were fed from the same leg. I would think though this would depend on the quality of the power transformers used in the equipment.

Even though the mono amp's power supplies are separate their signal grounds are still connected together by the ics at the preamp. The power from the wall outlet may be 120V that feeds each amp, but there is a difference of potential, voltage, of 240V measured from each hot conductor feeding the primaries of the power transformers of each amp. Again due to transformer leakage I wonder if there is a difference of potential between the two amps signal grounds?

Maybe an equipment design EE will chime in and give their thoughts on the matter.

One thing for sure I definitely would not use ground lifters on the amps.

Good advice being offered here by Jea48. Are you an electrician by chance?

120V(+)---[amp]---common neutral---[amp]---120V(-)

What could possibly go wrong with that?