Warm Audio WA-WL, Active Inline Microphone Preamplifier, Ultra-low noise JFET input, Balanced signal path (in/out), 26 dB gain, Switchable 100 Hz (12 dB) high-pass filter, Switchable 3 kHz (2.5 dB) high-shelf boost, Input impedance: 2.4 kOhm, Output impedance: 150 ohms, Max-Input: -11 dBu (218mV rms), Max-output: 15 dBu (4.36V rms) THD+N @ 15dBu: -100dB (0.001%), Output noise: 7.75 uV (A-weighted), at 150 Ohm input, Frequency range: 10-100,000 Hz +/- 0.2 dB, Requires 48V phantom power with 4.7 mA power consumption, Dimensions: 69 x 41 x 119 mm, Weight: 0.34 kg