Another factor may be the dynamic range of the original master tape. 45 rpm is definitely capable of better dynamic range, but if the range on the tape is within the limits of 33-1/3, you might not hear much difference with the 45.
Since most audiophile 45s are purposely not grooved as far in toward the spindle, and spin significantly faster at the end of a record than a 33-1/3, one would think that you would be able to tell the difference in the inner groove section of the 33-1/3 vs. the 45.
Since most audiophile 45s are purposely not grooved as far in toward the spindle, and spin significantly faster at the end of a record than a 33-1/3, one would think that you would be able to tell the difference in the inner groove section of the 33-1/3 vs. the 45.