15 amp circuit VS. 20 amp Circuit

@speelerr  I must be misunderstanding your post, most breakers have a trip curve chart, a 15 amp circuit breaker will not trip at 15 amps for a certain time period, which means your equipment could actually draw many times that 15 amps and not trip the breaker if it's for a very short duration of time and it can cause voltage drop. 

You will NOT have a difference. Period.

@speelerr have you checked the specs of my beefy 1.2k amps ? At 4 ohm, turning up these amps can cause issues. Literally every person I spoke with , recommends a single 20 amp circuit per amp, now I’m being cheap and will put both amps on a single 20 amp circuit per. 
 

that , and 3 other mono blocks pulling 380 watts for home theater , and all that jazz 

Check this out , same was happening to me 

https://audiokarma.org/forums/index.php?threads/new-amps-tripped-circuit-breaker.1000895/

will it all work on a single 15 amp circuit ? YES it will , on very low volume,  that’s not ideal , and yes I want to be able connect a blow dryer if I needed to… you get the idea my EE friend :)

Just saw this discussion and there are a lot of suggestions that are way overkill for your needs. I total agree with what IMPALER gave you for a good electrical suggestion to give you plenty of power for all your equipment.  To help with voltage drop, I would run 10 gauge wire on the dedicated 20 amp circuit. FYI, I’m also an electrical engineer by trade with over 40 years of power engineering experience. 

Don't use 10ga romex, every wire has a sound and it's sound is pretty bad for anything other than a sub. I know because that's what I did and now I want to rip it out! I'm back to using the shared 12ga run for now. For that level of system, I'd recommend something like Audience Hidden Treasure, and multiple runs on the same 120v leg. If that's too pricey, then at least buy cryo'ed romex or talk to Weinhart Design about other options they may have.

Sorry, this does not make sense.  The amps pull so much power that you need dedicated 20 or 30 amp circuits?  Yet they have internal fuses of "less than 15A"?  This proves my point that these devices pull far less Amps than the "music watts" lead you to believe.

Sorry joshziggie2021, I didn't realize you wanted to connect a hair dryer together with your "beefy" amp :)

@speelerr my krell ksa 300s has a 20 amp breaker it doesn't have any fuses.

Hire an electrician.

Spoke with a friend who is an MIT graduate. And we agreed , based on the power and the amps of 1.2k amps, we need to have each amp its own dedicated 20 amp circuit .( the benchmark amps can be connected to the same circuit )

subwoofers will share , two 20 amp circuits or one 20 amp circuit.

rest can be connected to a regular 15 amp circuit.

for those who suggested , minimum three 20 amp circuit for this equipment .. congratulations, you nailed it .

I just had a Electricion intall a 20 amp breaker for a dedicated line with a 15 amp receptacle, and said it will be ok. I told him I thought I read something that you can't do that. He said they do it all the time. So I researched it again and it's ok if other circuits are on the 20 amp breaker,but for a dedicated line it has to be a 20 amp receptacle.  Thank God I haven't pluded anything into it yet. Ordered a 20 amp Hospital grade red receptacle. 

Garry Mac. NEC 210.21 (B) (2) allows 15 amp receptacles on 20 amp branch circuits. If you have a single duplex device, it’s counted a two receptacles , you can plug 2 cords into it . If you had a device that had one receptacle, one cord it would have to have a 20 amp rating if it was the only receptacle on the circuit 
as for receptacle choice let your wallet be your guide! A good commercial spec device has good grip on the plug . Hospital grade is built to not let go of the plug unless 15 pounds of pull is applied.