I had the level 4.5 VSEI mod done to my stock SCD-1 several months ago. I did this based on many reviews I had read. I picked the VSEI mod precisely because it allowed to keep the stock sound if I wanted it.
I agree that the performance on redbook CD is very much improved. I had been using an Electrocompaniet ECD-1 as an external DAC for redbook. I still like it's sound, but almost always listen to redbook CDs using the VSEI mod.
I am of two minds on the performance on SACDs. It is deeper, broader and richer, but there is also a tad less "air" between the instruments and also hint of edginess/sharpness in the strings (basically I listen only to classical music) that is not there when I use the stock SACD outputs. Still, I listen mostly to the modded SACD outputs
These are prelimiary impressions, as I haven't had all tha tmuch time to listen to my machine lately.
I agree that the performance on redbook CD is very much improved. I had been using an Electrocompaniet ECD-1 as an external DAC for redbook. I still like it's sound, but almost always listen to redbook CDs using the VSEI mod.
I am of two minds on the performance on SACDs. It is deeper, broader and richer, but there is also a tad less "air" between the instruments and also hint of edginess/sharpness in the strings (basically I listen only to classical music) that is not there when I use the stock SACD outputs. Still, I listen mostly to the modded SACD outputs
These are prelimiary impressions, as I haven't had all tha tmuch time to listen to my machine lately.