Unlike line level audio sources like DVD/CD players, tape decks, FM tuners, mini disc, etc., which have output voltages anywhere from 0.7V to 2.5V, the output voltage from a magnetic cartridge installed in a turntable is very low (2-5mV), and requires additional amplification. This additional amp stage, the phono pre amp, was built into most older receivers and audio amplifiers, allowing direct connection of a turntable. However, since the CD entered the market (early 1980's), the vinyl records and turntables were declared obsolete. Audio equipment manufacturers slowly phased the phono pre amp out. Newer stereo equipment, including most mini-systems and home theater units, have no magnetic cartridge phono input. In order to connect a turntable, you need to first pass the signal thru a phono RIAA equalization pre amp.
Many newer turntables incorporate a phono preamp into the table, in the realization that most newer amps/preamps no longer have a phono input built in. If that is the case, and the turntable outputs an equalized line-level output, then the amp will work. The phono preamp has two functions. A) It amplifies the low voltage output of the phono cartridge to the level needed for a line-level preamp to work properly. B) It decodes the RIAA equalization that appears on all LP records. This equalization reduces the movement of the stylus in the groove of the album, but an attempt to play back an album without passing it through RIAA equalization (built into every phono amp) is not going to sound good. So, the answer to the question depends on whether or not your turntable has the phono preamp built in. You've got to have a phono preamp somewhere, but it's possible that you already do.