I love it ,the 28s driven by a beast like your 452 is all the amplification those beautiful line arrays will ever need ,at $3,300 for the 28s and the MX ,well you know the deal you got ,you could flip them into enough $ to score 290s if they come up but there's no real Sonic benifit of going any higher up the line array chain ,my XRT-22s sound every bit as sweet as the 290s I just gave to my brother ,I'm having extreme difficulty figuring out how to post pics here from my smart phone gallery ,no computer anymore ,but till then if anyone wants to see Roger Russell's White XR-290s in my home I have them on Audiogon where I'm member Bigjoe .
The reason I know your 452 is more than enough power is because when I 1st got the 290s from Roger I triamped them with McM1201s on bass ,Mc-500 & later on dual Mc-252s on mids ,on tweeters I ran a Mc-2102 and powered the amps from 3 dedicsded 20 amp lines , with 1,800 8ohm watts they sounded no better or worse than with my Mc-300 which isn't even an Autoformer amp ,I read your systems components & the only true Sonic improvement upgrade I can forsee for the next 20 years is adding a McIntosh tube preamp ,I've owned a C-20 for 26 years & a C-2200 for around 15 years and a C-2500 for a year ,the C-2200 is the hands down best preamp I've heard in my life ,If you can score a C-2200 your new line arrays wont have a bigger soundstage but it will be a more Fuller soundstage ,I don't like to use audiphile speak because it's too vague but I'm my experience the C-2200 adds a certian depth solid state lacks , a tube preamp on those 28s would really shine on all types of heavy rock ,funk & fusion jazz & your 28s are every bit the equal to the White XR-290s that graced my home for over a decade & are now turning my eldest brother into a full blown McIntosh Nutt ,you have reached the Pinnacle of McIntosh line arrays with your 28s ,I've auditioned the XR2ks and while they are a noticable step up from all previous line arrays the gains aren't large enough to justify a $50k used price tag ,your set for life ,I've had my 1st pair of XRT-22s over 20 years now & the 2nd pair since I built the & channel Mac rig 15 years ago & am still satisfied ,so much so that it wasn't hard at all giving Roger Russell's white 290s to my big brother for Xmas & your 28s will keep you in love with them for decades ,I'm excited by reading your posts because it makes me remember how I fell in love with my 1st line arrays & why very few of us ever feel the need to upgrade ,enjoy your gear my friend ,you now own 1 of the top 5 speaker systems ever built at any cost price point ,Merry Xmas .