Re: Why both 33 and 45 ?
It isn't just a question of loudness on the cut - the other major factor is groove packing, that is how close you can get a turn to its neighbours without overcutting or pre-echo. Among other things, dynamic range has to be considered - a big peak naturally needs a degree of Lebensraum. DMM has an advantage here, as the cut medium is stiffer, and there have been some very clever devices which calculate the available space in several segments of the disc as it is being cut, rather than spacing the whole turn. You can then use this space to cut at a higher level, to gain more playing time or to finish at a greater recorded diameter, thus reducing distortion.
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