DAC/Pre-Amp Advice

Below are recommendations for subwoofers (you should get two), a DAC, and a room correction device. With two subs the total would be about $3350.  You don’t need a preamp as you’ve already got a nice integrated amp.
https://www.svsound.com/products/sb-1000-pro-subwoofer

https://www.amazon.com/Gustard-R26-Discrete-R2R-DAC/dp/B0BDLKRK65/ref=sr_1_3?crid=1GVU3A5X076OZ&keywords=gustard%2Br26%2Bdac&qid=1673863633&sprefix=Gustard%2Br%2Caps%2C290&sr=8-3&th=1

https://www.ebay.com/itm/285086265679

As an alternative you could get this DAC, which is also excellent (I own it), and save $875…

https://www.usaudiomart.com/details/649937157-musician-audio-pegasus-balanced-r2r-dac/

I’d think incorporating these things would bring your system to another level entirely. Go with Qobuz and forget the MQA nonsense.  Hope this helps, and best of luck.

@kota1 Good questions. Normally it’d be connected through the tape monitor jacks, but as I just saw his Yammy doesn’t have that it might be as easy as connecting the anti-mode between the pre out and main in jacks, but that’d need to be checked — I have my doubts. He could definitely connect the DAC to the Anti-Mode, but that’d leave the turntable with no room correction.  Both DACs I recommended have HDMI inputs but not sure if they’d work with the with the Sony so that’d need to be checked as well. This is a bit of a tricky situation all things considered.

With that system adding room correction is a pain. I also don't like the idea of room correction for stereo sound.

+1 @travelinjack I’d focus on the other stuff first and then deal with room correction later.  @chuck_tamu Why do you feel you need room correction?  Where are your speakers situated in the room?  Often times experimenting with speaker placement can yield significant improvements, and it’s free!

but listening to the difference in room correction made me a believer.

Yeah, I hear ya and I’m a believer too.

I have the speakers toe'd in toward my seating position in the room. 
 

So, how far are the speakers from the front and side walls and how far apart are they?  My experience with your speakers is they tend to work well when angled in so they point just outside your shoulders and not pointed right at the listener FWIW.  I’m at a bit of a loss as to how to incorporate RC into your system as it is, but someone else here will probably have some good suggestions.

Try the speakers 6’ apart and another 1-2’ out from the front wall.  You should experience a nice boost in 3D imaging and larger/deeper soundstage and maybe even better overall frequency balance.  Just try it and see what you find.  And again, angle the speakers so they fire just outside your shoulders. 

I’m gonna reiterate — focus on the DAC, two subs, and speaker positioning first and then worry about room correction after that.  You’re trying to do too much at once IMHO.