You need a phono preamp between your turntable and your 950 input (I use Aux1 on my 950). Turntable output is extremely low, and a phono preamp is needed to boost this, as well as reverse the RIAA equalization that's applied to all LPs. (see http://en.wikipedia.org/wiki/RIAA_equalization for more details on RIAA eq)

In years past, most receivers had phono inputs, but once the CD surpassed the LP in popularity, most receivers dropped the phono input. The 950 has no phono input, but the forthcoming 998 will have one, I believe.

There are dozens of phono preamps in varying price ranges and sound qualities. I use and recommend the Cambridge Audio Azur 540p or 640p. Quite affordable with very decent sound quality.