@paradis sounds like this is a real functionality issue, I would start debugging it with balanced input preamp inspection.
Accuphase E650 XLR Input issues
I'm asking on behalf of a dear friend, he has an Accuphase E650 which was used on RCA input without any issues, recently with an upgrade of the source, XLR was chose as the preferred connection.
It works fine initially, however just after few days, the left speaker start to sounded noticeably softer than the right, sometimes it normalise sometimes it stay on as is for long period of time, these were done as isolation steps:
- Continue to use RCA input, works consistently
- Swap left / right XLR input, still the left speaker softer noticeably
- Swap different DAC with XLR output, still the same behavior, left speaker softer noticeably
- Tried different XLR cables, still the same behavior, left speaker softer noticeably
- Tried both the XLR preamp input (CD-in, and Balance-in), same behavior, left speaker softer noticeably
Ran out of options, the challenges was the amp was purchased from an oversea distributor, getting local dealer support can be a hit and miss, trying to post this up to see if anyone ran into such issue before and also seeks some opinion.
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@lalitk et al hey folks, i am sorry -- i didn’t mean to cause undue consternation i bought a used e270 couple years ago and felt the balanced input did not sound as pure as the rca input, to my surprise (i had a couple dacs at the time that had both single ended and balanced outs and i could hear the difference in my system) - i did not personally try the higher up models, and perhaps those are immune from this issue after that experience i saw the following information on the asr site -- please note that i am not a ’measurements guy’ in the least, particularly with respect to using measurements as a proxy for sound quality of any given component, but it was interesting to see the findings solely in regard to noise level in the preamp section and thru the xlr input of this tested unit i also spoke to usa importer briefly on this topic and confirmed this was an area that accuphase japan was working on, as traditionally accuphase gear was exclusively single ended in design, with no balanced connections thereafter, with the announcement of the replacement model e280, accuphase themselves mentioned that one of the notable improvement areas was in the balanced input noise level - see below page 5 https://www.accuphase.com/technical_information/e-280_technical_information.pdf
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- 21 posts total