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I have a hum problem that is driving me absolutely crazy. I think I have a ghost in the machine, really.I have a Sunfire Cinema Grand amp connected to a Rogue pre-amp, connected to a Denon DVD player connected to a ROCK+ scaler. The hum appears only when the component cables (BetterCables) are connected to the scaler. I know it is not the ROCK because I get an even lounder hum with my iSCAN Plus. When I disconnect the cable, vola, the hum goes away. I have tried RF chokes, tin foil, sourcing all components from the same outlet, different audio and component cables, voodoo, and prayer. Nothing works. Maybe I need to call-in an exorcist!
Right now, I have to disconnect the audio cables from the DVD player to the preamp. Ultimately, I may have to send them to my Lexicon pre-amp and forego tube heaven. (BTW, the Rogue has a pass-through feature that allows me to send the Lexicon signal through it to the Sunfire amp.)
Any help would be greatly appreciated.
Rags
"Always Searching for Perfection"
Follow Ups:
One of these days I want to invest in a good scaler, and actually see what my PJ is capable of. TAW claims to have the best, naturally. How does it compare to other scalers, and is it a huge improvement over the iScan?-Frank
Yes, the ROCK is a huge improvement over the iSCAN. The detail is better and the color is more vibrant - mork sparkle and snap. I also have a number of geometry tweaks (Ouput ratios) available for different resolutions.I run DirecTV at 480p and DVDs at 540p. HDTV is passed through the ROCK and looks great. Heck, even the VCR looks good.
Rags
"Always Searching for Perfection"
you are saying you run DirecTV?????? how is your dish installed? did you do it yourself or did someone install it for you?My one and only ground-loop in my system was caused by the dish being grounded to a different place than the house common-ground!!!!
Easy check..... disconnect the coax coming from the sat dish at the first entry into your system....either at the sat receiver or the surge protector (if you have it there first!!!)
Sam
It's not RF it's likely to be a ground loop....connect everything back up to get the hum, then disconnect everything from the back of your TV!! hum still there???Your component connections have a path to the TV, the cable to your TV is probably the culprit.... if you find the hum being caused by the cable (coax cable from provider digital/analog) find where the cable enters the home and ground it properly to the common house ground...
Sam
Thanks for the tip, but I have disconnected the RGBHV cables from the TV and the Hum remains. Perhaps I have a bad solder point in the Denon DVD player RGB connectors?Rags
"Always Searching for Perfection"
do you have ANY other cables connected to the TV that end up at the receiver...S-Video, Composite, Coax??????It could be a bad solder point.... you should be able to use a Multi Meter to measure the resistance and see if that's the problem..... disconnect 1 at a time if the problem only goes away when all 3 are disconnected then you STILL have a ground loop!
Sam
Wait..... why would you get an audio hum caused by the component cables if it is NOT a ground-loop???? does not make sense that it would be a poor solder point....(since component hook-up is STRICTLY video and carries no sound information)I'm certain your problem IS a ground-loop.... you just have to isolate components until you find the culprit... Just make sure that you have "0" connections coming from the TV to prove it's not the cable from the TV causing your loop....
Sam, I think you are on to something. While I am not home at the moment, I will start with the DSS, Cable, and remote antenna cables.I agree with you that it has to be a ground loop. The DSS was installed by a professional; however, now a days that does not mean much. Since these cables separately, or through a common cable, flow to the scaler, I'll bet they are the source. If so, the hum travels up the component cables to the DVD player, then through the audio cables to the pre-amp. I do not quite understand the electric principals governing the event, but if I disconnect the component cables the hum goes away.
Thanks for your help Sam!
Rags
"Always Searching for Perfection"
The Dish should be grounded before it enters the house, but the installer probably used the nearest source and NOT the common house ground!Sam
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