Our native mobile app has a new name: Fora Communities. Learn more.

Sub issue in new home - ground loop?

593 Views 3 Replies 4 Participants Last post by markmon1, Jun 30, 2021

collingwood

Discussion Starter · Jun 29, 2021

I run a Yamaha RX-A1040 with a 12" home built sub (has an older Apex plate amp (300w)) that worked very well in my old home. I recently moved and whenever I plug the RCA plug into the line in on the sub, it creates a significant deep hum. I have tried same outlets, same power bar, different outlets etc for the amp and the sub. No difference. When sub is on and not plugged into the receiver it is quiet. I am at a loss. I have had all the capacitors replaced in the amp in the past due to a hum, but as I said it was fine before the move. Home is new build (last year) with I assume modern standards for electrical services. Any suggestions?

Save

1 - 4 of 4 Posts

indebtbassfreak

· #2 · Jun 29, 2021 (Edited)

Most common source for groundloop is the cable box. Disconnect it,,,,,,, if no luck then disconnect everything except your avr. If the hum is gone with sub connected to your avr,,, start adding one component at a time until the hum appears,, you will then have your culprit. At that point try grounding that component. Also depending on the culprit, there are products you can buy to eliminate the groundloop. First thing first, find the source

Save

wuzzzer

· #3 · Jun 30, 2021

Try a different RCA cable, shielded.

Save

markmon1

· #4 · Jun 30, 2021

collingwood said:
I run a Yamaha RX-A1040 with a 12" home built sub (has an older Apex plate amp (300w)) that worked very well in my old home. I recently moved and whenever I plug the RCA plug into the line in on the sub, it creates a significant deep hum. I have tried same outlets, same power bar, different outlets etc for the amp and the sub. No difference. When sub is on and not plugged into the receiver it is quiet. I am at a loss. I have had all the capacitors replaced in the amp in the past due to a hum, but as I said it was fine before the move. Home is new build (last year) with I assume modern standards for electrical services. Any suggestions?

If you cant solve it just give in and get a blue jeans cable isolation transformer:

Amazon.com: Subwoofer Isolation Transformer/Ground Loop Hum Eliminator, Blue Jeans Cable Brand, Made in USA : Electronics

Buy Subwoofer Isolation Transformer/Ground Loop Hum Eliminator, Blue Jeans Cable Brand, Made in USA: Audio & Video Accessories - Amazon.com ✓ FREE DELIVERY possible on eligible purchases

www.amazon.com

This will solve it for sure and this is unique as it will not zap out any of your bass along with fixing the hum.

Save

1 - 4 of 4 Posts

This is an older thread, you may not receive a response, and could be reviving an old thread. Please consider creating a new thread.

Amazon.com: Subwoofer Isolation Transformer/Ground Loop Hum Eliminator, Blue Jeans Cable Brand, Made in USA : Electronics

Top Contributors this Month