So, given that you find the Mission a bit bright and lacking in bass, can we assume you are looking for speakers that are smoother and perhaps warmer?
And your budget is up to £2000/pr for a Stereo Pair?
And your current amp is the
Musical Fidelity M6si (£2500) with 200w/ch and USB DAC?
In all honesty, that amp dserves some £4000/pr to £6000/pr speakers, but that is easy for me to say since I'm not paying for them.
I would suggest you check out the Bowers-Wilkins CM series -
B&W CM9 - £2000/pr -
B&W CM9 S2 Floorstanding Speakers (Pair) - Superfi
Though well under budget, I would suggest you check out the
Wharfedale REVA 4 (£1300/pr), though they are not that easy to find -
New Warfedale REVA Speakers
A bit smaller than the Diamonds, but based on the YouTube sample I found, exceptionally clear without being bright or sharp.
Wharfedale Reva-4 Speakers (Pair)
The
Dali Opticon 8 (replacement for the IKON) have gotten so good review by forum members, at least give them a look and a listen -
Dali Opticon 8 Speakers - Superfi
In the same vein as the
Opticon, if possible at least give the
FOCAL Aria 936 a listen. I'm told that the
Aria 936 have mellowed a bit over the previous 836, and I would expect stunning clarity form them, though very balanced
(not exaggerated) Bass.
Focal Aria 936 Speakers (Pair)
I've not heard the new 900 Series but I did a couple of auditions of the 800 series and was very impress, though they are a bit forward, but I did not find them excessively bright. Again, I'm told the 900 Series are a bit mellower than the older 800 series.
Again a little forward, though not necessarily bright, the
Monitor Audio 8 or 10 are worth a look and listen -
Monitor Audio Silver 10 Speakers (Pair) - Superfi
Your Mission M52 are Single Bass Driver floorstanding, if you want to continue with the single driver design, the consider the
Dali Rubicon 5 -
Dali Rubicon 5 Speakers (Pair) Walnut - Open Box
I have no direct contact with
ProAc, but all indications are they they make stunning speakers, though less readily available relative to some of the other models mentioned -
https://www.hifix.co.uk/speakers/hi-fi-speakers/floor-standing-speakers/proac-studio-148-speakers
Of those listed, likely, as a best guess, the
B&W CM9 would be most suited and Th
e DALI Rubicon 5 would be closest to the speaker configuration you currently have, and the Rubicon should be pretty impressive speakers.
Just a few thoughts.
Steve/bluewizard