Question regarding cartridge outputs...

The unit cm/sec refers to the groove velocity cut into a record. This is how manufacturers reference (quote) their RMS output voltage (the number is asually approximately 5.7cm/s RMS).

Why? Because the cartridge's output is proportional to its stylus' perpendicular velocity. Your figures state that the cartridge's output will be the same when tracking a record with a 1kHz waveform cut at either groove velocity.

I assume those numbers are for two different cartridges...

If that is the case the second cartridge will have significantly higher output when tracking a track with say a groove velocity of 5 cm/sec. In fact output will be around 0.85mV for that track for cartridge 2 vs. 0.6mV for cartridge 1.

Seasoned's explanation of the numbers is correct as well.

to summarize the above, the output spec, in mV, is usually in reference to either 5cm/sec or 3.54cm/sec. The reference spec is often not listed so it can be important to research which one the company uses, as the actual output can vary by quite a bit, potentially making or breaking usability in a given system. To clarify Seasoned's last sentence, no cartridge has the same output forboth velocities.

Curious. Then the output of a cartridge DECREASES as the needle follows the groove spiraling into the center??? As the outside velocity is at least twice the inner velocity?
(my thought was the different velocity measures given referred to the cart at the outside edge @ 33 1/3 rpm, vs the middle of the record.)
Is the loudness difference between the outside edge, vs near the inner end, hearable?
(I have never noticed it myself... but then I was never looking for it either!)