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It is known that the DX7II (and TX802) has a better S/N ratio than the original DX7 (and TX7). Better D/A converters. I can't judge if the amount of noise you are experiencing is more than what is normal.

MT

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When you say digital noise I am assuming that you mean noise that is part
of the sound not background noise, hiss or hum. If that is the case it
could be due to fundamental differences between the DX7 and DX7II.

The DX7 has 12-bit digital to analog converters which is not really high
quality. This gives the sound a slightly gritty quality to the sound that
is most noticable as a note is fading away.

In contrast the DX7II has 16-bit digital to analog converters which is the
same quality as you get from a CD so the sound is smoother.

The integrated circuits and algorithms are also different which will
affect the sound.

So while the II is more Hi-Fi you may prefer the sound of the original for
certain patches. It is not a problem per say rather a preference. Own both
and be happy.

HTH,

Dave


On Fri, September 13, 2019 3:35 am, w.niessen@... [YamahaDX] wrote:

Hi,


I sold my DX7II and bought a DX7. This one has a digital noise on some
patches. I think its depend on the algorithm.
I never had such noise on my DX7II or not so loud.
Is this a knowing problem on DX7 or is there something out of order?

daved@...