For what it is worth: I have a number of 12” - 45 RPM “Radio station promotional” disks provided to the stations to support introduction of a new release, along with many of the same recorded pressings in standard 33 RPM. The 45’s were some of the first pressings of the new material. Most of these have the exact same recording on both sides. No question to my ears that the 45’s are superior: more detail, more dynamic. Aside from the hassle of a more rapid record change (single cut), IMHO they are much better.
Do 45 rpm 12" LPs really sound better than 33 rpm?
Increasingly, one can buy 12-inch 45 rpm LPs. Theoretically, they provide a wider dynamic and frequency range, but I come across a strange effect... Yes, the bass strings seem to be tightened stronger, but in general ... Imagine you have two cars with a power of 250 hp, but one is equipped with an honest atmospheric V6 or V8, and the second has 2 liters turbo.
Tell me, is it just my impression? Or maybe I need to change the cartridge or settings (for example, impedance) of the phono preamp?