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Post by videon on Feb 5, 2015 15:29:06 GMT -5
Welcome to the gang. And remember, Pembina is your friend  |
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Carlito55
Minor Hero
"I know what that is... That's music!"
Posts: 20
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Post by Carlito55 on Feb 5, 2015 22:33:59 GMT -5
Carl, You win my award for not only longest, but most interesting. Your story about the 60 Hz hum with the Sherbourn amp got my attention. I own two Sherbourn amps and have experienced a bit of a hum with the 7-350. I was hoping you would share a "magic bullet" cure, but see that the cure was to take it out of service. I'm not hearing a hum from my 7-150 and hope that the hum with the 7-350 will be cured with different cabling when I put it into service. Cheers! Chuck Thanks a lot for your interest Chuck. I try not to be boring when I open my trap and I think anywhere else but here my stories would have been very dull! Sadly, that's the nature of ground loops. There is no magic bullet because everyone has a different combination of components. When mine first cropped up I was pinning my hopes on XLRs after I got the xmc down the road but my plans changed and ended up taking the 7-150 out of the equation. On the surface that suggests the amp was the problem but it is the interaction of the 2 pieces that causes the problem. In your case, because your pre and amps are the same brand one would not expect to have this problem. I would think their ground voltages should be the same and the ground part of the circuits should be handled or wired in the same fashion. Also, ideally you want everything on the same house circuit, which given all your amp power doesn't sound like a good idea. I should theoretically be able to blow a 15 amp circuit breaker too but I haven't. Assuming your AC grounds are good, XLRs may be your last hope. However, do the same thing as I did if you haven't already. Disconnect patch cables till you get down to the pre outs. Connect 1 and listen, connect a second and listen. That will tell you if it's your pre/pro and amp combination. It's entirely possible that I could get it back when I pull the UMC out and put the XMC in. IF that happens I will not be happy! I will need XLRs to save me too. Maybe you've done some diagnostics already and I'm needlessly rambling again. Let me know what you've found. |
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Carlito55
Minor Hero
"I know what that is... That's music!"
Posts: 20
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Post by Carlito55 on Feb 5, 2015 22:38:51 GMT -5
Welcome to the gang. And remember, Pembina is your friend Thanks a lot. You know it!! It's all Emotiva's fault!  I recognize the word you used for your screen name. Tells me you've been on this earth for awhile. Unless I'm assuming incorrectly. |
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Post by cwmcobra on Feb 5, 2015 23:05:38 GMT -5
Carl, You win my award for not only longest, but most interesting. Your story about the 60 Hz hum with the Sherbourn amp got my attention. I own two Sherbourn amps and have experienced a bit of a hum with the 7-350. I was hoping you would share a "magic bullet" cure, but see that the cure was to take it out of service. I'm not hearing a hum from my 7-150 and hope that the hum with the 7-350 will be cured with different cabling when I put it into service. Cheers! Chuck Thanks a lot for your interest Chuck. I try not to be boring when I open my trap and I think anywhere else but here my stories would have been very dull! Sadly, that's the nature of ground loops. There is no magic bullet because everyone has a different combination of components. When mine first cropped up I was pinning my hopes on XLRs after I got the xmc down the road but my plans changed and ended up taking the 7-150 out of the equation. On the surface that suggests the amp was the problem but it is the interaction of the 2 pieces that causes the problem. In your case, because your pre and amps are the same brand one would not expect to have this problem. I would think their ground voltages should be the same and the ground part of the circuits should be handled or wired in the same fashion. Also, ideally you want everything on the same house circuit, which given all your amp power doesn't sound like a good idea. I should theoretically be able to blow a 15 amp circuit breaker too but I haven't. Assuming your AC grounds are good, XLRs may be your last hope. However, do the same thing as I did if you haven't already. Disconnect patch cables till you get down to the pre outs. Connect 1 and listen, connect a second and listen. That will tell you if it's your pre/pro and amp combination. It's entirely possible that I could get it back when I pull the UMC out and put the XMC in. IF that happens I will not be happy! I will need XLRs to save me too. Maybe you've done some diagnostics already and I'm needlessly rambling again. Let me know what you've found. I am using XLRs from the 7030 to the 7-150 and it is quiet. I haven't had the 7-350 out of the box in a long time and when I had the hum, it was with my UMC-1 before I replaced it with the 7030. Since the UMC-1 had no XLRs, I couldn't try that combination. When I put it all together, I plan to use XLRs for everything and will hope to have no hum. As far as running all on one electrical circuit, I think I can do that since my speakers are super efficient and will rarely get either Sherbourn amp off of idle. At least that's my story, and I'm sticking to it! Enjoy a great weekend! Chuck |
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