XLR Mic to stero input on HV40 - beat way? Wiring or in editing?

[videobread]

Best way? Wiring or in editing?

Does going from an XLR mic (Sony ECM-66B) to my HV40 stereo jack with the Hosa cable (second link below) defeat the purpose of having a high end mic? Should I go into the HV40 in mono and duplicate audio tracks in Vegas Pro 11?

http://www.mediacollege.com/audio/connection/xlr-jack-stereo.html
http://www.ebay.com/itm/Hosa-XVM-115F-15-Foot-XLR-Female-to-3-5mm-TRS-Stereo-End-Cable...item33865ba282

The two items above are wired differently. I bought the second (Hosa) on ebay.
I'm doing voice - monologue and want the same on both channels.

[Cornucopia]

Kind of. That cable is a passive cable, doing nothing WRT impedance mismatch nor level adjustment, and only fudges the balanced to unbal connection. It will work, but not near optimal. Better (pro quality-wise) to get an active mixer/adapter/balun or just plug in the xlr and do the mono thing in post as you mentioned.

But who knows? You might be satisfied with it...

Scott