Yes, Happy Cake Day!
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Al, I have a stereo amp I use for surround channels that developed hum that is audible through the speakers.
No idea why this developed out of nowhere.
I had one of these lying around:
This eliminated the hum in my case.
FYI
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Does anyone know if the BHK 300 has this? quick google below. I have two new FS12 SE from Rythmik I am hooking up. They worked, for a bit, then one now does not. I hooked up to the back of the amp second set of binding posts. Red to red black to black. I am having an issue with one of the Subs. it worked and now it does not. Did I break something?
More info
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Al
If one of your other components like the Commander or the PZ have a ground lug connect the negative wire of the REL subs to it. That worked for me with subs and the BHK 250.
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Brian, I don’t know about the BHK, but I do know that the Rythmik high level cannot be used with floating output amps. That’s what kept me from buying them. I got this right from - what’s his name? - Brian Ding.
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Yes, so did I buy the wrong version of Rythmik? and of course they are used. I should have checked this out..grrr. And of course I could just run some XLRs, but it only has RCA since they replaced the XLR with speaker level.
Happy cake my friend!
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Happy Cake Day! Is your SDFB happy nowadays?
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@dawkinsj so how did you hook up yours? on the phone with Brian Ding now. He mentioned I could try black to ground lug. on the 300 where is the lug. Looking at pictures at work now but do not see a dedicated lug.
happy cake day.
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Have some cake, Tony. Be sure it’s well grounded.
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Happy cake day!
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Happy Cake Day Tony from the East Coast (of Florida)
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Happy Cake Day Tony.
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If you can temporarily grab RCA cables, you can use them to see if the subs still work.
Brian
No ground lug on the BHK amps. I used the ground lug on the preamp in my system but any ground lug in the system should work. Other option is to use a chassis screw.
Back in 2020, there was a good bit of discussion regarding hum when connecting differential output amps (specifically the BHK 250s/300s) to REL subwoofers.
Here is the thread: BHK Pre and Power on the Way - REL Subwoofer Question
Initially, PSAudio provided a free ground lug, to anyone who asked, that could be affixed to the amp rear panel. This did not fully resolve the issue for most - myself included.
REL then offered a resistor network that could be connected between the amp and REL subwoofer. It was offered for the princely sum of $100. Steep to be sure but it resolved the hum issue for virtually everyone (myself included).
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My subs were plugged into the bad circuit. Moved them to a good circuit and they became silent again. But the amp. in a good circuit, still hums. I have the Emotive devices coming. Shipped today. I will give those a try for the amp.
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Looking at your power cords to outlet photos - I would always remove those blue mesh plug protectors.
They can introduce static noise.
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Good luck. In the effort to try everything, unplug the C214’s, not just switch them off. No reason, other than they specifically work in the 60 cycle range.
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