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Help -- EAD PM1000 and REL Strata III experience?

When I turn off my amp, I get a loud hum, unless I turn down the volume, from the REL. My understanding is that the PM1000 has no grounding, due to its internally bridged design (dual differential?). I've contact EAD and my REL dealer, but no luck yet. Has anyone experienced this with my combination. I tried lifting the ground with a cheater plug, connect REL's grounding lead to the PM1000 chassis screw--still the hum. I have yet to contact Sumiko. It's my last option.

Thanks for any help.

Ken
kyyuan
sugarbrie
3,854 posts
 
I have the same thing with the REL Storm III. Did not happen with my old amp, but does with my Blue Circle. I just turn the sub off before the amp.
homosapien's avatar
homosapien
70 posts
 
Hi!
I never noticed any hum from my REL Storm because my PM1000 is always on. Now I tryed some different set up and I am getting this hum only in one case - if Rel low input not connected to my Ovation. Is your low unput connected to your preamp?
If not try it or at least ground the outer contact of low input.
Please let us know what is the result.
BTW what is your Rel set up (phase, volume, roll off)?
Boris.
tacs
220 posts
 
I had a hum with my REL Storm and I figured it was because the thin unshielded cable out of the amp into the sub was picking up radio frequencies. If there is a way to shield the cable the answer may be there. I was careful to route the cable away from power cords and such and that did the trick.
sugarbrie
3,854 posts
 
It is definitely a ground hum, not RFI.
kyyuan OP
28 posts
 
Everyone,

After a long week of work, I finally got a chance to fool around with the "Rel Leads" connection. No luck. I tried different combinations as Vongwinner suggested and the hum noise persisted. I'm a at a loss. My dealer told me that he'll check with Sumiko. I guess we'll see. Thanks for everyone's postings. Any more suggestions?

Have a nice labor day weekend, (for the U.S.)

Ken
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