Line-level Ground Loop Isolator Subwoofer
Hi Folks,
I recently had to replace the amp in my subwoofer and the new setup produced a loud HUM, where it did not before. The HUM went away when I pulled the RCA lead from the receiver (Onkyo tx-nr8009) so I figured the subwoofer was good. The sub is produced by a local speaker repair shop.
I put a Radio Shack Ground Loop Isolator, $17.50, into the line between receiver and subwoofer and it seems to solve the problem HUMMMMMMMM.
Question: Does anyone know what that Ground Loop Isolator did to the frequency response of my subwoofer? Do you think it passes the signal through pretty clean, or is it chopped up? Kind of hard to A/B when you need to switch cords.
Thanks very much for any ideas.
I recently had to replace the amp in my subwoofer and the new setup produced a loud HUM, where it did not before. The HUM went away when I pulled the RCA lead from the receiver (Onkyo tx-nr8009) so I figured the subwoofer was good. The sub is produced by a local speaker repair shop.
I put a Radio Shack Ground Loop Isolator, $17.50, into the line between receiver and subwoofer and it seems to solve the problem HUMMMMMMMM.
Question: Does anyone know what that Ground Loop Isolator did to the frequency response of my subwoofer? Do you think it passes the signal through pretty clean, or is it chopped up? Kind of hard to A/B when you need to switch cords.
Thanks very much for any ideas.
Ground Loop Isolator Radio Shack
Aug 16, 2012 I would try to break up the ground loop some other way. I had a TV audio ground loop issue and I had to use one. Since there were no specs on the Radio Shack part I bought a much less expensive mystery spec unit on line. It did the job. If I really had to use one on a turntable I would get an external phono stage and put the isolator after the. If the hum persists, install a line-level ground loop isolator on the subwoofer's line-level feed cable. This usually solves most hum problems. If nothing helps, disconnect all the audio cables from the subwoofer. Leave the subwoofer plugged in and switched on. If the subwoofer hums, it points to a defective unit.