I am getting a hum on my subs that I'm pretty sure is related to signal ground.
It is a low level low frequency hum. It may be 60 Hz, but actually sounds even lower frequency--like 20 - 30 Hz.
I'm using a Parasound JC2 preamp, 2 Rythmik 12SE subs, and a dual 10" DIY sub. The signal goes into one Rythmik sub, and the other subs are daisy chained as slaves.
I hear the hum regardless of which source is selected through the preamp. Its level is independent of preamp volume. I hear it running RCA from the preamp secondary outputs to the subs. I tried an RCA to XLR level converter with volume which affects the hum level. I hear it regardless of running RCA or XLR to the subs. If I bypass the Rythmik subs and plug the XLR straight into a DIY sub I also hear it.
My AtmaSphere M60 amps are dead quiet running XLR inputs. The amps are plugged into the same circuit as the subs, which is close but different than the circuit to the front end.
I lifted the ground on the subwoofer with no effect on the hum (I pulled the ground out of the IEC cord and shrink wrapped it). I then used the same ungrounded power cable on the preamp with no effect. I think I need a galvanic isolator to lift the signal ground, but before I buy another box I thought I'd ask for suggestions.
Here are a few I found that look interesting.
The first uses Jensen transformers to isolate the RCAs. I have a good opinion of Jenson, but if I don't have to spend $250 I'd rather not.
https://www.parts-express.com/Jense...pzKx0UnPjeN2V4-ahpzXzuppI2yj8A9IaAp2ZEALw_wcB
or
https://www.bhphotovideo.com/c/prod...800_1024_Twin_Iso_Balanced_Line_Isolator.html
There are other highly rated products for under $100...
https://www.amazon.com/Transformer-...ocphy=9032030&hvtargid=pla-761120909432&psc=1
https://www.bhphotovideo.com/c/product/380761-REG/Rolls_HE18_BUZZ_OFF_HE18_Buzz_Off.html?ap=y&smp=y
What recommendations do you have?
Thanks,
Evan
It is a low level low frequency hum. It may be 60 Hz, but actually sounds even lower frequency--like 20 - 30 Hz.
I'm using a Parasound JC2 preamp, 2 Rythmik 12SE subs, and a dual 10" DIY sub. The signal goes into one Rythmik sub, and the other subs are daisy chained as slaves.
I hear the hum regardless of which source is selected through the preamp. Its level is independent of preamp volume. I hear it running RCA from the preamp secondary outputs to the subs. I tried an RCA to XLR level converter with volume which affects the hum level. I hear it regardless of running RCA or XLR to the subs. If I bypass the Rythmik subs and plug the XLR straight into a DIY sub I also hear it.
My AtmaSphere M60 amps are dead quiet running XLR inputs. The amps are plugged into the same circuit as the subs, which is close but different than the circuit to the front end.
I lifted the ground on the subwoofer with no effect on the hum (I pulled the ground out of the IEC cord and shrink wrapped it). I then used the same ungrounded power cable on the preamp with no effect. I think I need a galvanic isolator to lift the signal ground, but before I buy another box I thought I'd ask for suggestions.
Here are a few I found that look interesting.
The first uses Jensen transformers to isolate the RCAs. I have a good opinion of Jenson, but if I don't have to spend $250 I'd rather not.
https://www.parts-express.com/Jense...pzKx0UnPjeN2V4-ahpzXzuppI2yj8A9IaAp2ZEALw_wcB
or
https://www.bhphotovideo.com/c/prod...800_1024_Twin_Iso_Balanced_Line_Isolator.html
There are other highly rated products for under $100...
https://www.amazon.com/Transformer-...ocphy=9032030&hvtargid=pla-761120909432&psc=1
https://www.bhphotovideo.com/c/product/380761-REG/Rolls_HE18_BUZZ_OFF_HE18_Buzz_Off.html?ap=y&smp=y
What recommendations do you have?
Thanks,
Evan