McCormack DNA 500 loud hum
I also recommend calling or emailing Steve, (he's actually on here sometimes). I've known Steve since way back in the Mod Squad days. He's a great guy and wouldn't design a product that had problems. I think it might be something else within the interactions of your system. If this was a problem from the design, I would think it would have raised it's ugly head by now. I've owned a few of his products and never had any problems. |
yes, call Patrick, Steve and Patrick are two of the most helpful people you will meet. Prices are fair by audio standards, and their work is top shelf reliable! www.smcaudio.com such a beautiful brut you have there, I would hate to see her not working. Call Patrick, send her to them, they will make it right! and while your at it get some upgrades,.... you WILL be satisfied. |
Yeah, I agree. I own a DNA 225 and it's amazing. I read a lot about the DNA 500 and know about Steve's reputation and if this was a problem someone would have encountered it. But my technician is a really knowledgeable guy and he says the RCAs should have been grounded and it's a poor design so I'm in a quandary. For now I'm going to use XLR to RCA cables and use the XLR connections on the DNA. Hopefully that will solve the problem. |
It not the caps, that would just make a mild hum and they all look in good condition. An amp this old is unlikely to have cap problems. This is a loud open circuit sound, like if you (very stupidly) remove one rca while the amp is on, like I've done on other amps on occasion. I was worried for my speakers it was that loud. |
I talked to Steve. I'm amazed a guy like that just answers the phone! He had some suggestions around my system that is quite complicated. He said it might be blown fuses. Anyway, I checked, the fuses are fine. My tech suggested getting rca to xlr cables. I got a specific kind he recommended, something to do with pins that I didn't follow. Anyway, long and short, using rcas is catastrophically noisy, using the xlr inputs with xlr to rca cables and the amp is up and running and sounding great. |
