Outlet Requirements

I'm goingt to assume that you had the electrician install 3 separate circuits (2 @ 20 amps each + 1 @ 30 amps). If this is not the case please let us know. Does the 30 amp circuit have a 30 amp receptacle? That would be an odd choice because it wouldn't accept a standard 3 prong 120 volt 15 or 20 amp power cord. I'm going to make another assumption that your electrician installed a 20 amp 3 prong receptacle for the 30 amp circuit.

The main reason for installing a 20 amp or larger circuit is that it uses a larger gauge wire than a 15 amp circuit. That means that if you turn your system up loud and it draws lots of wattage, there is less voltage sag. Your Maggies are very power hungry and if you rock the house, those amps could suck a lot of juice. That means that it could be a good idea to plug each amp into its own 20 amp circuit and use the other circuit for all of your other components.

I just built a house with a dedicated listening room. I had it wired with 3 20 amp circuits but I had one circuit wired with 10 gauge wire instead of 12 gauge, which is what code requires. I did this because I'm running a Krell KSA 300s with very low sensitive speakers and sometimes I listen really loud. The amp has to work a lot less hard if there is little voltage sag as the power usage goes up.

Holy moly, they do exist!

@yogiboy Wrote:

 I have never seen a piece of audio gear with a 30 amp power cord!  

My Crown Studio Reference 1 amp has a factory install non detachable 10 AWG power cord and a 30 amp plug. See here image two

Mike

Not making fun of a 30 amp circuit.

Pointing out the fact in a light hearted way the OP stated a 30 amp outlet.

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People making fun of the 30A circuit.   Same people use 10AWG power cords which indeed are what the code calls out for 30A.  You can never go wrong providing a more rubust power supply to your amp.

And btw, my welder requires a 100A circuit.  

Jerry

Could always plug your generator into it...

@jokomo Do you mean one 30 amp Circuit Breaker?

@skids 

+1 

30 amp outlet would be for listening to heavy metal, while welding.

"I had my old house’s wiring upgraded to include two 20A outlets and one 30A outlet for dedicated audio equipment. "

What will you plug into a 30 amp outlet? I have never seen a piece of audio gear with a 30 amp power cord!  

Long ago, I lived thru a few summers in Brooklyn with frequent brownouts, I know what poor power sounds like.

The older I get, the less I go for BS that prevents convenience, as long as I experience no detriments

After the separate circuit(s) to the location:

I use a Furman P-1800 (PF R Version)

Power Factor Technology supplies 45+ amps of instantaneous reserve current, on demand, for power starved amplifiers

https://furmanpower.com/pages/prestige-series

always on sale somewhere, new $350 eBay

I figure: since everything is coming from the unit's internal capacitors, I could plug it into my air conditioner's or refrigerator's circuit and get away with it.

I actually plug the Furman into my Chase RLC-1'a switched accessory outlet for remote system power, then the Furman's capacitors, then the equipment, so everything is going thru a single device rated for15 amps. It's got a fuse, I can't blow it. 

You may find these specifications helpful:

https://www.stereophile.com/content/mark-levinson-no436-monoblock-power-amplifier-specifications

Keep in mind that most of us barely ever ask our amps to produce more than 20-30 watt peaks, so as long as you power on your amps in sequence instead of all at once you could run all of them from 1x 15A line. 

You mentioned the outlets but not the wiring.

Do you have 3 circuits, running to 3 separate receptacles?

ANd what was your thiking about the 30A outlet??