*DAC

@navyachts I agree USB sounds better with the N200 but would also like to add that the fiber converters degraded the sound in my system. I’d say try and remove them, go straight into the N200 with a good Ethernet cable and see if you still like the fiber converters after you hear it as is. 

LinkUp Ethernet cable from amazon is very decent. I toss it in once in a while.
I mainly use Purist Audio Design though. Audioquest Vodka and Diamond are raved about on these pages. I haven’t tried these in my system but I can immediately hear the difference between the LinkUp and the Purist…will be interesting to compare Purist to AQ..

Just try it without the fiber converters first before you do any upgrades. I’m curious what it’ll do in your system. Whenever you have time. 

@navyachts I tried Audience Forte F3 power cables on the Montis and there was a slight improvement. I didn’t bother buying better cables though as I’ve made up my mind on a speaker upgrade. I did like the Montis though, they were nice. Your 13A are newer and a lot better as far as bass integration with the panels and overall sound quality. You’re on the right path with your upgrade strategy.

@navyachts the suggestion by @ghdprentice to try a Chord DAC is right on target I think. Chord has a great tone, good dynamics and offers few filter options to fine tune the sound. I was running a Chord Qutest when I had the Martin Logan Montis with Pass XA30.8 Class A amp and it was a very good match. 

Also, just my opinion…the Martin Logan 13A are warm and delicate sounding speakers when it comes to the presentation. Your amps are Class A and that in general is going to mellow things out all on its own with sweeter treble and plush bass.
So just some options aside from changing a DAC…look into trying different speaker cables and interconnects. I can’t tell what you’re using now but if the cables are contributing to additional warmth in the presentation, you might still be facing the same challenge with a new dac. Again, just a thought…

Ah…just went back to your system page and saw this

Stock power cables, Blue Jean speaker cables (12 awg - 6ft long) Blue Jean interconnects 

is that still accurate?

@navyachts I owned bluejeans XLRs and still own a set of RCAs. I also own and use Canare 4S11 speaker cables with my AVR and just for 💩s and giggles 🤭 tried them in my main rig. None of these cables belong in the system the caliber of yours. 

Here’s how I would tackle the cable upgrade path -

1. Upgrade speaker cables. Stay with major brands for this system (Kimber, Nordost, Transparent, Audioquest, Audience). I used Audience AU24SX with my Montis and still use them with the Wilsons I have now. You can pick up a used pair for a reasonable price. I would also recommend looking into Nordost Frey 2 or Tyr 2.  I would upgrade interconnects or power cords next. With the length you need for the interconnects it would be more economical to tackle power cords first. You will get a good amplifier of improvement with upgraded power cords. Once again, look for major brands, used. Audioquest Hurricane, would be nice on those amps. Audience AU24SEi works great with digital and is a good deal used.  
But I would start with the amp for power cable upgrade and move up the chain from there. 

Downside with the cable upgrades without having your dac up to the task is that you will hear what it is and isn’t doing right. So you weren’t down to last piece of the puzzle. Hehehe 

Oh yeah thanks @jetter! +1 on Supra. Forgot about that. I used it as well. I even tried the Audio Sensibility version terminated with the Telegartner RJ45 connectors.