Technical Specifications 4 CHANNEL MICROPHONE PREAMPLIFIER + INSTRUMENT DI FULLY DISCRETE, TRANSFORMER COUPLED, THROUGH-HOLE COMPONENT TOPOLOGY ALTRAN USA CUSTOM WOUND, PREMIUM INPUT AND OUTPUT TRANSFORMERS X520 DISCRETE OP-AMP IN EVERY CHANNEL, SOCKETED FOR CONVENIENCE. CAN BE USER-REPLACED WITH MOST 6 PIN, DISCRETE OP-AMPS FOR VARYING FLAVOR & TONE 65DB OF GAIN INPUTS - MICROPHONE XLR & ACTIVE INSTRUMENT 2MEG OHM HI-Z OUTPUTS - TRANSFORMER BALANCED XLR & TRS -20DB PAD - PADS BOTH MIC AND INSTRUMENT DI INPUTS TONE BUTTON INPUT IMPEDANCE - SWITCHES FROM 600 OHMS TO 150 OHMS (AFFECTS THE TONE OF BOTH THE MIC AND HI-Z INPUTS) SELF NOISE: <-90DB (NOMINAL) FREQUENCY RESPONSE: 20HZ TO 20KHZ <+/-0.25DB (TONE BUTTON OUT), 20HZ TO 20KHZ +/-2DB (TONE BUTTON IN) +48 VOLT PHANTOM POWER LED METERING OUTPUT TRIM KNOB FOR PRECISE LEVEL CONTROL AND TONE SCULPTING INTERNAL POWER SUPPLY (GROUNDED, 3 PIN IEC CORD)