Aurender ACS10

@andreleon36 

 I’d start by upgrading the DAC before anything else. My suggestion would be a DAC from Lampizator, LTA, or the AQUA (like La Scala Mk II).  Any of these would represent a substantial step up from the Mytek both in musicality and overall refinement.

https://www.audiogon.com/listings/lisbf056-linear-tube-audio-aero-dac-new-da-converters

https://www.lineartubeaudio.com/products/aero-dac-digital-analog-converter

There are many used DAC listings here and on USAM. 

https://www.usaudiomart.com/details/650256201-aqua-la-scala-mk2/

Maybe and CJ ET7SE? This is a contemporary CJ Preamp. Changing brands would add an additional level of complexity. I think the CJ is a very complimentary preamp in your system.

Lampizator, LTA, Aqua ,are not available over here in France. 

CJ ET7SE used not found . What about a used Cary SLP98P ? or aARC LS27 ?

I have an all Audio Research system. If I didn’t It would be all CJ. Yes I would highly recommend the LS28SE, or LS28, or LS27SE... how ever far back you have to go back. I have the Reference series.

A good friend whom I helped to choose his system has an LS28SE. It will a bit more detailed and neutral, but musical like your CJ. If that appeals to you.

I feel that the warmth of your CJ helps to offset the more neutral lean Manhattan.

I’d put your equipment and proposed changes into ChatGPT and evaluate to sonic characteristics of the change. It typically does a great job. 

JI followed your opinion and asked CHAT GPT for advice. Here is the conclusion: my system is among the best. Only the Manhattan could possibly be changed, but before a significant expense it is advisable to try a Converter- Reclocker such as Berkeley Alpha USB or Dernafrips Gaia 12TH between ACS10 and Mytek output in AES/EBU 110ohms. What do you think?