Musician vs. audiophile

Just switch out the speakers.  The magic may not be from the Mac.  I used to sell audio and was free to audition speakers at home when the store was closed.  Same preamp and amp,,,  but each speaker sounded entirely different.  The Martin Logan's may be the magic there.  But,  then again. It could be your room as well.  Try the speakers alone first would be my suggestion.   And, yes.  I am a musician.  ;)

If you do not like the sound of McIntosh and Martin Logan then you are in the minority.  I loved them when hearing a demo.  As a musician your wife has tuned ears.  I am the same.  Not only the music but the accuracy of instruments sounding as live.  Violin cat gut vibrating cello string.  Can you hear the resonation of the wood chaber of the instrument.  Other people listen differently.  I thought a pair of B & W 683s I heard at best buy were harsh in the highs and had no dynamics in the bass.  Could be the recording?  The demo room?  Many people like them but I did not.  So I fall in your catagoy there.

trelja, I couldn’t agree more.  Love the ESL57’s for their amazing midrange purity.  I don’t own Quads, but that level of midrange and high frequency correctness is the reason that I put up with my Stax ESL F-81’s maddening low end and SPL limitations; amazingly realistic timbre which rivals the Quads, imo.  Driven by tube mono’s in many respects they make some of the most realistic sounds I’ve ever heard from a sound system.  

Is mcintosh not a well respected audiophile brand?

I agree with Stevecham. If you are using subs they need to be timed correctly with your mains. Most mains react a fraction of a second faster. than the subs. Use a processor or cable lenth to correct this problem. When you got it right your bass will pop. I have a 4 millisecond delay to my mains in my system. Bestbuy in my city has a Magnolia store inside select Bestbuy that is separate operation that carry high end equipment.