The DL102 is described here: http://www3.sympatico.ca/murraya/DenonMonoPage.htm
There are many times you'll want to choose either side of the groove, which you
can't do with a mono cartridge. I use a receiver with a Dolby Pro Logic unit and
use its center channel output for the same effect..removes a lot of vertical
noise. Ian G. Masters wrote about this in his audio column in the Toronto Star
about 12 years ago as a means to get clean sound out of beat-up 45s..I
immediately got a JVC unit and found it did exactly what he said it would do and
was great for removing a lot of the rumble from laminated Columbia 78s.
dl