Power draw

[Bill S]

I have two HSU ULS-15’s plugged into the same circuit. It also has at least the lights for the theater on the same circuit. I have noticed in the odd instance that I have the lights up and I am playing a bass intensive scene that the lights Dim with significant bass hits.

Am I losing sub amp power/overhead because of this?

I would like to know the science. Of course a dedicated circuit(s) would be better but I don’t want to go through the labor and expense unless there is true value.

The HSU website says it needs 1,200 peak watts at the wall, so two would be around a full 20 amps for two. I have not checked but I’ll bet that is a 15 amp circuit.

Thanks in advance for your help.

[Bill S]

Peter, are you out there?

[Dr_Hsu]

If the wiring is good, voltage should not drop much even when you approach 20A short term. The problem arise when the wiring is not up to par - loose or oxidized connection.

[Bill S]

I am confident in the wiring. The electrician was good and the house is 2 years old. I was concerned with how the amps might react on an "overloaded" circuit.

Thanks for you reply.

[Dr_Hsu]

A lowered line voltage will simply reduce max output power. It will not harm the sub. Even if the power is reduced by 30%, its unlikely to be audible. A dB or two less is usually hard to detect without a A/B comparison.

[Bill S]

Thanks for the reply