Phonograph records have three basic problems... 1. It is physically impossible to press them with ridges that end up allowing low frequencies to come out at the same reproduction level as mid and high frequencies. Bass compensation is therefore needed during playback. 2. Records produce a certain amount of hiss which is covered up in post-production by boosting the gain of the high frequencies before pressing. Counter-EQing during playback compensates for this. 3. Magnetic cartridges produce a weak signal, which must be boosted to match the rest of the amplification, and this too is done during playback. The DJ PRE II (formerly named the Phono MicroPRE) acts as an interface between your turntable and your audio recording / playback system. The analog input capacitance can be switched between 100pF and 200pF to optimize your phono cartridge response. A switchable low cut filter removes turntable rumble while leaving the audio pristine. The front gain trim control and signal/clip LED allow you to optimize the preamps gain for a wide range of input sources. The built-in low noise phono preamp circuitry is highly accurate and precisely conforms to the RIAA standard. The line output jacks are low impedance and can be used with any sound card. Housed in an all aluminum black anodized case, the DJ PRE II can be powered by a wide variety of external supplies. If you need to amplify and EQ your vinyl records to interface with your audio workstation, sound card, home stereo system or main monitor system, the DJ PRE II gives you flawless audio reproduction in a rugged and reliable package.