You have echoed my feelings exactly about such a fine instrument being plagued with such an annoying problem.� I also got a preamp, but it does not solve the problem.� It has been a huge disappointment to me.
John W
>From: "Jerry Dutcher"
>When I got my new MkIII Disklavier last year I noticed the same thing.��I have a very audible 60 Hz hum coming out my DKV speakers -- not outrageous, but definitely audible.��When I connected the aux outputs to an amplifier it WAS outrageous.��The aux outputs are quite low level -- not at all full line-level signals.��Thus a modest amount of 60 Hz hum on these lines will be amplified disproportionately.��I spoke to Bill Brandom at Yamaha -- he was familiar with the problem and recommended the use of a mixer/preamp with the aux outputs.��I picked up such a unit at my local Guitar Center outlet, and it brought the hum down to a tolerable level.��I still hear the hum very clearly, but frankly most casual listeners don't notice it.
>
>My conclusion is that while Yamaha did a fantastic engineering job on the basic DKV instrument, the electronics design did not receive the same degree of attention.��Yamaha has in their corporation a world class audio electronics arm, and the design techniques for minimizing and eliminating line frequency hum are well understood.��It is beyond my understanding why they did not apply some of this knowledge to the DKV electronics design.��Proper grounding, filtering and shielding throughout could eliminate this problem, but it would take an electronics redesign to accomplish it.
>
>Jerry Dutcher
>
>----- Original Message -----
>�� From: J D
>�� To: disklavier@yahoogroups.com
>�� Sent: Tuesday, November 23, 2004 5:05 PM
>�� Subject: RE: [disklavier] hum from amplifier
>
>
>�� I have a similar problem with my DC7A.��It is more noticeable when I have recorded from the auxiliary outputs.��I will be interested in knowing what you guys suggest.
>
>�� Thanks,
>
>�� John W
>
>
>
>
>
>�� >I have a new DC1A with an intermittent problem:��There is
>
>�� >occasionally a hum that comes from the amplifier - perhaps the power
>�� >supply.��The noise does not come through the speakers but comes
>�� >directly from the amplifier box.��Has anyone else had this problem?
>�� >Unfortunately, the problem disappeared when my tech arrived, but of
>�� >course, reappeared after he left.��Any solutions?
>�� >
>�� >Thanks.
>�� >
>�� >J. Young
>�� >
>�� >
>�� >
>
>
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