One dedicated circuit for each mono block?

@yesiam_a_pirate 

One dedicated breaker, #10x4 line, one leg to a dedicated 9’ copper earth ground stake and the other end to the amp chassis. 

Hopefully that dedicated 9' copper earth ground stake is tied to the other load center ground rod(s). Ground rods only exist for lightning protection, and you should never have any that are not tied or connected to each other. 

@immatthewj

Is there a good chance there is some knob & spool going on here

...highly doubtful if you say your house was built in the 60’s. Most times the ground was the conduit or metal clad cable running between the fuse box and outlets. After many years of high humidity or dirty environments, those grounds can decay (no longer being of low resistance), as the conduit and metal clad cable connections start getting dirty, begin loosening, or begin oxidizing.

@jea48

by chance do you live in Chicago, IL or New York City, NY?

I do not. I know why you’re asking 😊 - the WNEW-FM and WXRT call letters just happen to pop up in my system pictures. I’m a radio guy. At one time I was a big fan of both stations.

@immatthewj

I am thinking I should pull one of those old outlets without the third wire and see what’s going on back there.

It sounds like you’re referring to having an outlet with only two spade inlets (with no 3rd for ground). Yes, that was typical in older homes; even ones built in the 60’s. One can many times just replace the outlet with a standard (non-isolated ground) outlet (which uses the conduit or metal clad cable ground), and you’ll then have a NEC rated grounded outlet. This is an affordable needed tool when doing that:

AC outlet tester

@immatthewj

I wonder what I paid the home inspector for 30 years ago.

I don’t believe most home inspectors will make the seller upgrade outlets. They’ll now make them replace old fuse boxes, but typically the outlets can stay as they are.

what is interesting is that all of the 2 spade outlets are all the same circuit that they did not do.

My guess is someone didn’t want to turn off all of the devices or appliances on that circuit, to replace all of those outlets...or the customer was willing to only pay for so many outlets to be upgraded. Or someone got tired, and said the heck with the rest.

@immatthewj

I think that I should pull some of those outlets off & see what I have got going on back there. . . .

I would be very surprised if any of your 3-prong outlets have a 3rd wire ground connected to the outlet’s ground terminal (many 1960’s house outlets don’t). Someone at some point probably replaced many of your house’s 2-prong outlets with 3-prong outlets. For some reason, that 2-prong outlet that you’re referring to was missed.

I take it that  the 'standard (non-isolated ground) outlet (which uses the conduit or metal clad cable ground)' you referred to will have the 3rd ground.  I wonder if that is what they did in the rest of the house where the outlets do have the 3rd ground?

My guess is yes, that is the case.

@immatthewj

He did catch a furnace that failed the CO test, so I got that out of it.

IMO, that right there paid for your home inspection.

I was just wishing that the home inspector I hired would have pointed some things out for me.

Sometimes these guys don’t always offer, but will answer any questions asked (of course there are some that hate someone watching over their shoulder all of the time). It’s all a learning experience. After many years being an on-air DJ, I became a Radio Broadcast Engineer (a much more stable position in radio). I never went to any technical school to get a degree for this, but learned from all of the many radio broadcast engineers (aka Chief Engineers/Operators) I became friends with (and shadowed - I was always asking questions), and all of the on-the-job experience (and there was plenty of it!). I’m pretty good with HVAC too, again, always asking questions to the techs that serviced numerous units I was at one time responsible for.