Magnepan mg1.6 vs mg1.7 bass quality?


Will the 1.7 improve on the 1.6 in terms of bass quality and punch? Maggies are not know for bass punch, so anyone compared both head to head? Will only consider moving to the 1.7 it it can improve on the bass punch from the 1.6. How about toal balance, read somewhere that the 1.7 is brighter and leaner? Would still prefer a warmer, softer presentation.

Currently running a bryston 4bsst2 amp and a cary slp03 preamp
lecram
Pass also seems to be a great match, "Then I tried a set of Pass Labs XA100.5 mono amps with the 1.7 which immediately had me revising my opinions of the speakers";
http://www.tonepublications.com/MAGPDF/TA_030.pdf
Once I added mono block power the speakers bloomed. They are thrilling now and much fuller sounding than the 1.6's . The new crossovers are made to do that. But if you have the 1.6's I would only change to the 3.7's....
Thanks guys for the advise. I plan to buy the 1.7 then do a side by side comparison after break-in of the 1.7. If the 1.7 really proves superior, then i can sell off my 1.6 which is coming off 10 years already.

Cant really go for the 3.7 as it would ruin room aesthetics, and i would never really be satisfied with the bryston 4bsst2 running a 3.7, and moving up to the 14bsst2 or other higher powered amps would cost me so much money which i am not willing to spend

I was really just hoping that the 1.7 can improve on the 1.6's detail on top and bass punch down low.