DSJR
Major Contributor
The late 90's change to the SL drivers was a revelation I remember, the ability to play quietly so much better than the 100A's I had. Some said the 50's went a bit 'bright' but to me they simply reverted in balance to the early 90's version (with simpler amp 'handles' on).I would guess that the SCM25 and the SCM40A sound fairly similar, they pretty much share the same frequency extension and have similar drivers. The 25s may have the higher-specced drivers but I doubt it will be a night-and-day difference in sound quality because of that.
There are probably very few people who have compared them side by side, as the shops selling them are likely either pro dealers or regular HiFi dealers. Also, the demo environments are likely highly different with an acoustically treated room at the pro dealer, and a fairly untreated room at the HiFi shop. I also think it’s a risk of expectation bias towards the professional speaker being the better one.
Have anyone here heard them side by side?
Domestic dealers will sell what makes them profit and I'm increasingly convinced that too many dealer staff members these days lack any real electronic or science education in general, nor it seems the curiosity to try to find out about the products they sell and install. Sure I'm painting with a broad brush here though.