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Ho Ho Hummmmmmm...
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<blockquote data-quote="Shonver" data-source="post: 48808" data-attributes="member: 34"><p>;D</p><p></p><p>As Ampdog has suggested, it does appear to be earth-related. The humming was removed by adding an earth connection to the Yamaha receiver's chassis; from mains earth to chassis (the mains IEC receptacle on the Yammie does not have an earth pin). But now, the left-hand speaker still hums when the amp is turned off. Here, I suspect poor interconnect shielding. Further investigation after sunrise...</p><p></p><p></p><p></p><p>Yes, Dewald: it is "new". They use the same tweeters and mid(/bass) drivers as the DSP6000's use, so now I'm seriously reconsidering my initial plan of upgrading the mids and tweets of the '6000's. Just some touch-up needed here-and-there, and some new grille cloth. But that's all a bit off-topic...</p></blockquote><p></p>
[QUOTE="Shonver, post: 48808, member: 34"] ;D As Ampdog has suggested, it does appear to be earth-related. The humming was removed by adding an earth connection to the Yamaha receiver's chassis; from mains earth to chassis (the mains IEC receptacle on the Yammie does not have an earth pin). But now, the left-hand speaker still hums when the amp is turned off. Here, I suspect poor interconnect shielding. Further investigation after sunrise... Yes, Dewald: it is "new". They use the same tweeters and mid(/bass) drivers as the DSP6000's use, so now I'm seriously reconsidering my initial plan of upgrading the mids and tweets of the '6000's. Just some touch-up needed here-and-there, and some new grille cloth. But that's all a bit off-topic... [/QUOTE]
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