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"As always the AHJ (Authority Having Jurisdiction) has the final say."Actually my electrician had the final say. Being an audiophile he has investigated this. He, as I stated and you paid no attention to, did not recommend it. His comment to me that more than one was not needed. There was no mention of regulations or laws regarding this in my post.Based on his 38 years in the trade, both residential and industrial and a personal friend, I'll go with his recommendation over yours anytime.
Both channels at the same time? But no noise when grounding is floated at the outlet
now you have a ground loop problem,which has nothing to do with ps capscheers
I checked the dedicated lines and I am getting 119 V on one line and 120V on anotherCould this be a clue?Previously, it was 119V on both.This was checked from hot to neutral and from hot to ground to see if there was a difference. There was not. Shouldn't this mean the grounding is OK?However, I went outside and found the ground rod. It's a piece of rusty rebar very corroded. Unknown length. The copper wire is still good though.The old telephone system is grounded about 40 feet away around the back of the house to a piece of galvanized pipe that runs into part of the concrete poured patio area.The telephone system is Not used but I cleaned up that ground and there was no change.I purchased two new copper plated 8 ft ground rods and will install those sometime this week.I still am very concerned about the Loud buzz noise that the speakers make when the amps turn off. It's the same in both channels. It's quite loud- kind of like a large bumble bee / large winged grasshopper but metallic, slower in cadence and has static noise. It rises, falls and diminishes in about 2 seconds. These have NEVER made this noise before. I unplugged all devices from the 2nd dedicated outlet and the noise is still there.
Historically, after over 1000 GG posts, this may be the first time I agree with him. So I'm probably wrong...
I still am very concerned about the Loud buzz noise that the speakers make when the amps turn off. It's the same in both channels. It's quite loud- kind of like a large bumble bee / large winged grasshopper but metallic, slower in cadence and has static noise. It rises, falls and diminishes in about 2 seconds. These have NEVER made this noise before. I unplugged all devices from the 2nd dedicated outlet and the noise is still there.
DaveC113,This is not your typical garden variety ground loop hum though, would you agree?jmdesignz2 said:I would think the ground loop hum would be present and consent while the amps were powered on as well. Would you agree?
I haven't been given enough info to say with any certainty. The fact that the buzz went away on the channel when the amp's ground was lifted, and that there's the same exact noise on both amps means it's probably not PS caps going out. Yes, if there's a ground loop hum it should be audible at all times, which I think is the case...My initial thoughts are he's running his system on two separate circuits, this is often an issue... if a CATV/etc. ground is also involved here then that's another potential source of problems and even more likely to be a problem than running a system on 2 separate AC lines.
My initial thoughts are he's running his system on two separate circuits, this is often an issue... if a CATV/etc. ground is also involved here then that's another potential source of problems and even more likely to be a problem than running a system on 2 separate AC lines.
I reread the OP's posts this morning and maybe I missed it, but he really doesn't say the hum/buzz is present all the time while the amps are powered on. From what I understand his concern is when he turns off the power to the amps.I posted asking some questions for the OP to answer above. Hopefully he will respond.He said in an earlier post the phone line lightning grounding arrestor ground wire was connected to a dedicated earth ground rod. IF..., the ground rod is not bonded, connected, to the main grounding Electrode system of the electrical service then there is a very high probability a difference of potential, voltage, will exist between the two earth connections. IF..., the OP is using a DSL phone line modem that connects to his audio system in any way that could be the source of his problem.As for the two dedicated 120V 20 amp branch circuits that feed the two amps if the dedicated circuits were installed using the proper accepted branch circuit wire and wiring methods that should/would not be a problem. IF......He could try, maybe he already has, plugging both amps into only one of the dedicated circuits. In fact plug all the associated equipment that is connected together with wire ICs or patch cables where the signal ultimately reaches the two amps.It also should be mentioned, as I mentioned in an earlier post, the signal grounds and most likely the power supply B- rails of the two amps are tied together when they are connected to the DAC's analog output jacks. Would you agree?
