Power Cables and Wall Sockets

It was fortunate to not have healed the scars before Thomas saw them.
That could have been a bit of a problem.

If the OP’s power amplifier’s power supply was not heavily over regulated, and maybe even then, the circuit that feeds the amp is staving the amp of power when playing high dynamic music material. The dimming lights is proof of that. The AC mains VD may be, (probably is), lowering the amps rated power output.

An an oversized high capacity shielded toroid power transformer is meaningless if the AC mains voltage can’t feed the transformer the power it needs to operate properly.

Quote from link provided by OP.

Power Supply Circuits

The Vision SET 120 Control Amplifier has an oversized high capacity shielded toroid power transformer and multiple regulated power supplies for all areas of the amplifier including the output transistors, to provide incredible dynamic range, bass extension, transient detail, and air. All of the power supply parts are selected for long life, reliability and operate well within their technical specification ratings..

@jea48 Said!

If the OP’s power amplifier’s power supply was not heavily over regulated, and maybe even then, the circuit that feeds the amp is staving the amp of power when playing high dynamic music material. The dimming lights is proof of that. The AC mains VD may be, (probably is), lowering the amps rated power output.

An an oversized high capacity shielded toroid power transformer is meaningless if the AC mains voltage can’t feed the transformer the power it needs to operate properly.

Quote from link provided by OP.

Power Supply Circuits

The Vision SET 120 Control Amplifier has an oversized high capacity shielded toroid power transformer and multiple regulated power supplies for all areas of the amplifier including the output transistors, to provide incredible dynamic range, bass extension, transient detail, and air. All of the power supply parts are selected for long life, reliability and operate well within their technical specification ratings..

I concur!

 

What is known is NO power cord will solve his dimming light VD problem...

Very true!

The lights dimming is caused by voltage sagging. Voltage sagging is caused by one of two things:

• The amount of current being drawn
• The amount of resistance to the current., either on the hot or the neutral wire

The voltage drop (or loss) is an easy calculation:

V = A * R

That is, the voltage lost is equal to the current times the resistance on the line. Since A is a function of the amplifier we can’t really reduce that except by new amps or more efficient speakers. 😁

What you can control:

• Reduce other loads on the circuit such as the lights by switching to LED types
• Ensure all the connections between the breaker panel and lights are tight
• Run the audio on a dedicated circuit
• Run a thicker gauge wire to the circuit
• Ensure you don’t have excess voltage on the neutral. Shouldn’t ever measure more than a couple of volts.

It may very well be worthwhile to you to get a cheap voltage meter you can sit and watch while playing music, like this one, which not only shows you the AC voltage but the Neutral to ground voltage, in other words, tests if you have a bad neutral: