Phoenix Audio DRS-1R-500, 1-Channel Preamp with Instrument Input, For 500 system, -30 dB input pad, 40 dB Variable gain, High pass filter: -6 dB / oct @ 120 Hz, LED level meter, Output: + 26dBu @ 1kHz, Self-noise = -90 dB @ 20 - 20,000 Hz, HI Z instrument input, Phase reverse, 48 V phantom power switchable, Type: 500 module