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drdna wrote:

Since both sides use different amplifiers, I think there may be incomplete correlation between the two sides in terms of coincidence of frequency response. Small changes in frequency response that vary with frequency and amplitude between the two sides may impact the image stability, focus, dynamics, etc.  or have more subtle difficult to define effects. I would be interested to see if there are any detectable differences between the frequency response  at different loudness levels of the two sides where different amplification is used. Adrian

Well,

The incomplete correlation between the two sides in terms of frequency response is not a problem at all. It is easy to monitor and easy to take care. Furthermore I feel that minor misbalance between frequency response and left channel is not a big deal. The rooms are asymmetrical and we always have right/left frequency response misbalance, even at HF. What I afraid it might be is something deeper, something that is not on surface, like some vibrant harmonic discrepancies between the single-stage high Mu IDHT and DC-coupled DHT, or some kind ULF wobbling of my DC-coupled solution. I think it is something more fine then frequency response, as the sound generally is quite good but the  it feels that something is keep drifting in music while is plays. It is not firm and sound is not locked firmly in its presentation manner.

Paul proposed that it might be my caps are still burning in. Possibly but from what I recall it was different before with my new Nichicon caps. What is very amasses me is that the extreme latitude ends of what they call “soundstage” are not the curbed toward to me but curbed in opposite direction. This is very bizarre. I know how to deal with it by positioning of my speaker but why shall I move speaker if I juts change the MF amp that presumably (?) does the very same as the old amp did?

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