Classic Records vs. Analogue Productions

Milimetr, just a few thoughts about which you may already be aware:

The Classic Records 45rpm classical music releases are significantly better sounding than the earlier 33s were. This is largely due to changes in Bernie Grundman's mastering chain that he was forced by Wilma Cozart Fine to make at the time he undertook mastering the Mercury reissues. This is not just the difference in the 45rpm cutting speed, it comes from moving to tube cutting amps and a much improved signal chain.

The 45rpm RCA titles coming from AP are not new masterings (to the best of my knowledge). They are new pressing runs from the same metal work but now being pressed at QRP rather than RTI. The QRP pressings I have (none of the ones you've asked about) are very good. But so are the RCA 45rpm pressings that I have that were pressed at RTI.

I have not been able to tell any difference in the single-sided pressings from double sided-pressings. There may be a difference, but I've not compared the same LP pressed both ways. Reports from a meeting at the LA Audio Society when Hobson demo'd this were that the single-sided copies did sound better. But, again, I've not heard it and the double-sided copies I have from AP and MM sound simply amazing.
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Thank you for your opinion.

I am aware about superiority of Classic Records 45 RPM compared to 33 ones.

For example:
My 4x 45 RPM single side 180 g Time out is WAY better than Classic 200 g 33 RPM. In my opinion this 45 RPM 180 g is more neutral and pleasant sounding than later 4 x 45 RPM 200 g on black vinyl.
I did not heard Classic 4 x 45 RPM on 200 g Clarity Vinyl, nor AP 2 x 45 RPM.

I am curious if it is worth to get 2x 45 AP when I have 4x 45 180g from Classic.

Another example. 12" single 45 rpm on Classic clarity vinyl Satchmo plays Oliver sounds better than their 180 g release on black vinyl.
However when compared Classic 180g with 200g 33 RPM on black vinyl the later one sounded fuller and boldier, when the first one was more similar to original release.

Also 8x45 RPM single side Classic Buena Vista Social Club souned better than their 33 RPM 200g edition.

So for me there is no doubt that Classic 45 is better than 33. However 8 LPs instead one is a bit Problematic to listen.

The question is if never AP 45 RPM releases can be even better than Classic 45 single sides on black or clarity vinyl.
The question is which one edition is ultimate edition.

Those QRP pressings are great in my experience. And in such cases this will likely be a pressing by pressing matter. Steve Hoffman Forums is a great place to get opinions on different pressings.

I have heard that Classic pressings could be inconsistent (even 45 RPM) and you wouldn't have the option of exchanging a poor pressing for a better one since they are out of business. QRP may end up being a safer bet in that way...

I am curious if it is worth to get 2x 45 AP when I have 4x 45 180g from Classic.

All I can offer to this is that I am not replacing any of my 4-sided RTI pressing for the new QRP 2-sided pressings. Two reasons: 1) too much other really good music that I want to add (e.g., the Yarlung vinyl issues) and 2) the WRP pressings must be from later generation stampers so we're getting further and further away from the cleanest stampers possible off of this metal work.
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Does the stampers for the same title one single sided 4x45 RPM and other double sided 2x45RPM are the same?

I thought that CR and AP may use the same master source byt the stampers are new one for each pressing...