<div dir="ltr"><br><div>So effectively short the 2 center pins to 1 (as if going mono) and then cut one of the grounds out completely?</div><div><br></div><div><br></div></div><div class="gmail_extra"><br><br><div class="gmail_quote">
On Sat, Aug 10, 2013 at 4:41 PM, Alex Carver <span dir="ltr"><<a href="mailto:agcarver+ale@acarver.net" target="_blank">agcarver+ale@acarver.net</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div class="im">On 8/10/2013 14:55, Robert L. Harris wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
So I have a Yamaha RX-A1010 receiver. It's been great so far but not<br>
enough volume when we want to have a party, etc. So I picked up an<br>
external Amp by Gemini.<br>
<br>
When I plug the pre-out from the Yamaha into the Gemini I get a low hum<br>
that almost sounds like static. If I plug my DVD player or Phone into the<br>
Gemini using an adapter ( 1/8th -> RCA ) the noise goes away, crisp clear<br>
sound. If I use the Yamaha speaker out no noise either. It seems to only<br>
be from the Yamaha to the Gemini. I can use either of the pre-out ( front<br>
or surrount ) or the headphone jack on the front and the sound persists.<br>
<br>
Any thoughts on how I can clear it up? The yamaha is out of warranty (<br>
2.5yrs old) and a great unit but just too quiet on occasion.<br>
</blockquote>
<br></div>
Without actually hearing the sound I'm inclined to believe you have a ground loop. You can test for a ground loop issue by making an RCA patch cable that connects only the center pins together and leaves the ground on one end unconnected. If the sound goes away it's a ground loop and you just either use that patch cable with the lifted ground or get a transformer-based ground loop isolator.<br>
<br>
It won't happen on your phone because the phone isn't grounded. The DVD player may have isolation in it (or it may not be grounded at all, either, if it's got a two-prong plug).<br>
<br>
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</blockquote></div><br><br clear="all"><div><br></div>-- <br>:wq!<br>---------------------------------------------------------------------------<br>Robert L. Harris<br><br>DISCLAIMER:<br> These are MY OPINIONS With Dreams To Be A King,<br>
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