Between 5% and 7% perceived improvement according to Meridian representative at launch of SE speakers I attended in Oxford.

However this is not the whole story, just a reasonable response to the inevitable question when something new hits the market.

I eventually bought into the concept with 5200SE and have no regrets, but I still really appreciate my 5200SL pair in another room.

You cannot make a silk purse from a sows ear, there will always be a small difference but some may disagree.

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