I've just got my Plantronics Calisto Headset from Dragon, I removed the old user files and started fresh with with a new user. I did the mic setup, and the reading. Unbelievable 31 db signal to noise ratio. I let it read some txt files I saved from the past and started the dictation.
I'll give a little more detail which may help someone, I go into the control Panel, click Speech reconition, on the lefthand side at the bottom click Audio devices, This gives me sound, I set the Plantronics as the default, click the recording tab, set the Plantronics as the default again, then click properties, which brings up the mic properties, I click the top tab levels to set the recording level. Then I'm back to dragon to set up the mic ect.
I've been using dragon with Hal for ages and it works great for me. I've found one of the things which helps me most is letting it read files you have saved after dictating them. Ps, I'm still using Dragon v 10.1.
Carl2