Integrated Amp upgrade path

Yes, MC was a typo.  Really nothing about the Mac I don’t like—just have been very interested in Boulder.

Had not given much thought to upgrading the front end—-kind of in the data is data camp, but admittedly without much knowledge.  Will give that approach a good look.  Any streaming DAC recommendations?

Thanks to both responders!

@hsw—Not hard at all.  I set levels and crossovers in pairs, from the bottom row up.  Crossover level is lowest for the bottom pair, second row a bit higher and third row is higher again.  Levels follow the same pattern from low to high, but are closer together.  Then after those were done, small tweaks to each row as needed.  I found the level control to be the most sensitive and it had the biggest impact, but it was not hard to match with the volume of the main speakers.  I have a small room (10 x 14), so YMMV.  Maybe an hour’s time, max. 
The line array concept was a big plunge for me, but the results are spectacular:  wider soundstage, bigger image, better clarity, and most significant to me, more heft/substance/weight (without any hint of softness) to the rendering of each note, tone, vocal, or percussion—across the whole music spectrum really, which to my ears has always been one of the hallmarks of live music.  Not a cheap upgrade by any means, but  the ROI is stunningly good.