2. amps-preamps
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A buzz in my speakers-Ideas???

My system: Pass X-250/Martin Logan Ascents/Rotel 1066 Pre/Pro- Phillips 963sa/Adcom 5503 3/ch amp-Pioneer 50" Plasma/Monster cable 5100 power purifier/surge protector. My source for TV is Direct TV. I also have 6 dedicated 12-2 romex lines for each component into 6 hospital grade outlets. With these components in place my sytem ran dead QUIET. No hum/no buzz. I recently sold the Adcom and bought a Krell KAV 3250-With the Krell in the system I had an annoying buzz regardless of which outlet it was plugged into-and regardless of the speakers it was hooked up to. When I plugged it into the Monster 5100-into the outlet labeled amp-all was quiet. I've read often that a contraption like the Monster 5100 will choke the amp. Furthermore I ran individual dedicated lines/circuits so I can utilize them-not avoid them. Any help would be appreciated. I'm in the process of running one more dedicated 10 guage line on a dedicated circuit just for the Krell. Its in a basement so its very accessable.
My questions are? Would it be worth it to install a new ground rod-so that I know my panel is properly grounded?
Would an isolation transformer possibly remedy this problem?
Is their a power product(regenerator????)that might help without choking the amp?
BTW-all these questions are being asked under the assumption that there is nothing wrong with the amp. Which is also being checked out as we speak by Krell. Any and all help would be appreciated.
krelldog
7 responses Add your response
kr4's avatar
kr4
3,649 posts
 
Before spending money, the usual culprit is the cable or satellite input. Try running everything as you would like to (no conditioner, separate lines) but with the satellite input and power completely disconnected (from AC, pre/pro and display). If this eliminates the noise, your satellite antenna/receiver is improperly grounded and DirectTV should be required to fix it.

It's worth a shot.

Kal
shiva
181 posts
 
My tube amp put a buzz in my speakers. I used a cheater plug on its power cord and it went away. You might try just lifting the ground with the cheater plug and see what happens.
rudd
51 posts
 
Check the A/c plug on the back of our amp...if there's a 3rd prong on the unit, that is more than likely the cause of your problem. The extra conector will generate a 60 hz cyle humm which may be coming through you cable TV. Try disconnecting your cable vision and see if the problem does away. I had the same problem and the culprit was my cable TV which was not properly grounded. Unfortunately, the only workaround was to buy a cheater plug (which as I understand can be a fire hazard), OR purchase a Jenson transformer ground loop isolater. I picked one up off Ebay a few months ago for 50 dollars and the problem was solved immediately. Here is the part # VRD-1FF and here is the website to lern more about the product www.jensen-transformers.com/
lacee
811 posts
 
The Bryston site lists the Torus line conditioner as being the only conditioner they have found that won't limit the power to their amps.They used to promote plugging their power amps directly into a wall outlet
krelldog OP
308 posts
 
Thanks for all the responses. I'll check out that Torus conditioner. Thanks again.
accent
41 posts
 
I just did the dedicated line/seperate ground rod and STILL had buzz with only the amp/amps hooked up. Cheater plug solved it, everything else has 3 prongs.
YMMV
MMM
krelldog OP
308 posts
 
The thing I don't understand is it DIDN"T buzz before with the Pass X-250 and the Adcom 5503. Even know with just the Pass hooked up its dead quiet. BTW- I did check out that Torus conditioner. I'm not sure what it costs-but it looks real exspensive..........When I get the amp back-hopefully one of the above tweaks will work. I'll try the cheater plug-but it just seems like that defeats the purpose of all the power tweaks I've already made.
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