Ground loop with new receiver - 10/27/10 04:19 PM
Hi All,
Been an Axiom user now for about 6 years and still really like them. I decided to treat myself to a new receiver. I purchased an Onkyo TX-NR870, I connected my front speakers and then the subwoofer rca cable. The minute I plugged it in I started hearing a soft hum/buzz. This is with the unit off, I then went to plug in the HDMI cable from my Blu-Ray player and the minute the shell touched the chassis the buzz got 10X worse. I checked out the sub and found the RCA input jack to be a bit loose. I opened the sub and resoldered all the connections which didn't help. The sub does not buzz with my old reeiver so I'm assumign it's the receivers grounding issues. I spoke with Onkyo service and they said to return the unit. I did and the new unit does exactly the same thing. Any idea's? I tried lifting the ground on the sub power cable and it only made it worse. On another note when I opened up the sub - the plastic casing completely fell to pieces like the plastic is dry rotted. The plastic is so brittle that one touch breaks it off...Any help would be greatly appreciated.
Been an Axiom user now for about 6 years and still really like them. I decided to treat myself to a new receiver. I purchased an Onkyo TX-NR870, I connected my front speakers and then the subwoofer rca cable. The minute I plugged it in I started hearing a soft hum/buzz. This is with the unit off, I then went to plug in the HDMI cable from my Blu-Ray player and the minute the shell touched the chassis the buzz got 10X worse. I checked out the sub and found the RCA input jack to be a bit loose. I opened the sub and resoldered all the connections which didn't help. The sub does not buzz with my old reeiver so I'm assumign it's the receivers grounding issues. I spoke with Onkyo service and they said to return the unit. I did and the new unit does exactly the same thing. Any idea's? I tried lifting the ground on the sub power cable and it only made it worse. On another note when I opened up the sub - the plastic casing completely fell to pieces like the plastic is dry rotted. The plastic is so brittle that one touch breaks it off...Any help would be greatly appreciated.