My baseline is acceptable quality pressings from commercial labels which are far more natural sounding than these. In general I don't care for remastered reissues from audiophile labels that's why I didn't buy the 45's before. The blacker backgrounds you mention are too prominent for me and also the EQ with goosed low bass and truncated mids washed out lower mids and upper bass is missing so much on some of them. This type of synthetic faux audiophile presentation is exactly what I hate, hence my comments specially give the hype for these pressings. We all have different standards and for me "Natural" is the only reference and I find these lp's far from natural sounding and overly processed.I just listened to a couple to compare the 45 to the SRX. In the two randomly picked, I'm going to have to describe them as more similar than different.
First off, Lou Donaldson "Blues Walk" sounds very good on the SRX. I still get ambient cues, for example. Horace Silver "Song For My Father" sounds really similar between the two, with the SRX having a blacker background. I could *probably* pick them out in a blind A/B ... but I wouldn't bet on it.
So... thus far, with two random choices on quick compare, I can't call the SRX a piece of sh!t. @ddk - perhaps you might pick up a couple of the MM 45 and then see if you think the SRX is significantly worse. I don't, on the couple I tried. Maybe they are all garbage, then. But I don't think so there, either...
david