This phono preamp can be used to raise your turntable's output to make it compatible with modern amplifiers. At the same time, it adds standardised equalisation. Users may need this phono preamp because their turntable either doesn't have one, in which case they won't be able to play records without one. Or maybe users just want to upgrade their turntables sound beyond what's possible with the built-in preamp. This preamp supports AUX input and has an accurate and stable integrated circuit design. Size (LxWxH): 145 mm x96 mm x 31mm Features For all turntables with moving magnet (MM) cartridges or audio devices with line level (e.g. tape decks) External housing, reliably shielded against interference Top quality circuit technology and components Built-in low-noise phono preamp circuit conforms to the RIAA standard Power supply included Input Impedance : 47K ohms Output Impedance : 100 ohms Phono Amplitude Gain : 40 dB (@1KHz) AUX Amplitude Gain : 6 dB Maximum Input : 50mVpp Output Level : 5Vpp Frequency Response : 20 Hz to 20K Hz Signal to Noise Ratio : 70 dB Power Source: 12 VDC Size (LxWxH): 145 mm x96 mm x 31mm