Hi Asa Post
If you wish to invest more cash, so be it.

I want the product to perform perfectly out of the box, and 5200's to my ears do exactly this. The SE upgrade price for 7200's over the time of availability rose by IIAC 2000 pounds. This was prohibitive and not worth the investment. Either Meridian got their sums wrong in the first place or margin was the name of the game.

It would not be a great idea IMO at this time to invest in any high end M DSP speakers other than MQA rendering capable products e.g. new products with a generous discount, as upgrade kits are no longer available.

Hector

AV: Thorens TD160B, SME, ShureV15MK2, 500, 598, 861v4, DSP7200.1, DSP3300HC Samsung UE55, SkyHD.
DINING: MS600, AC200, DSP5200SEUG.
STUDY 504, Roon Nucleus + RevB, 808v6, 5200SE, Mac & PC (Touch Screen), Prime+PS Grado GS1000i
HORIZONTAL: M80, MS200, Red Rose Spirit + Sonus Faber Toys, iPad Mini
A capella to Zydeco