Typically when you connect a professional microphone with XLR outputs to a 3.5mm mini-plug input, you're not going to get very good results. 3-pin XLR's have a different impedance than mini-plugs. You may get better results with the ME66 if you use an impedance transformer like the Hosa MIT-156:
http://www.hosatech.com/product/0/MIT-156/_/Impedance_Transformer%2C_XLR3F_...
If you go this route, make sure you're using the ME66 with a battery, and that you plug it into the external mic input, not the line input.
The Sennheiser 44p is a stereo mic with two XLR outputs. You definitely want a recorder with two XLR inputs for that mic. A good choice for a recorder would have been the Zoom H4n. It has 2 XLR inputs.
http://www.sam-mallery.com
