AEA TRP3, Microphone Amplifier, 2 Channels, 85 dB Gain, Switchable 48V phantom power, Phase inversion and high-pass filter: 115 or 230 Hz, Equivalent noise level: -130 dBu (typical), 40 Ohm source, Equivalent noise level: -128 dBu (typical), 150 Ohm source, Max. XLR output level: +27 dBu at 600 Ohm, Input impedance with phantom power: 11.3 kOhm, Input impedance without phantom power: 68 kOhm, Dimensions (W x D x H): 216 x 203 x 457 mm, Weight: 0.89 kg