The Rolls MP13 is a single-channel microphone preamplifier with both XLR and 3.5mm inputs, and XLR and 1/4" outputs. Its key specifications include a max gain of 60dB (XLR) or 54dB (1/4"), a THD of <.01%, and +21V to +24V phantom power. The unit operates on a 12-15VDC power supply and has a compact size of approximately 3.4" x 4.2" x 1.4". 

General specifications

• Channels: Single-channel

• Power: 12-15VDC, with a +21V to +24V phantom power option for condenser mics

• Dimensions: 3.4" x 4.2" x 1.4"

• Weight: 1 lb (0.45 kg)

• Case: Road-ready metal case

• Phantom power: +21V to +24V, 6mA

• Power supply: AC adapter included 

Input and output

• Inputs: XLR and 3.5mm TRS balanced mic input

• Outputs: XLR and 1/4" (can function as a stereo headphone output)

• Input Impedance: 10K Ohms balanced/unbalanced

• Max Input Level: +4dBV (XLR balanced), +10dBV (unbalanced) 

Performance

• Max Gain: 60dB (XLR), 54dB (1/4")

• Total Harmonic Distortion (THD): <0.01%

• Intermodulation Distortion (IMD): <0.01% (SMPTE)

• Common-Mode Rejection Ratio (CMRR): >80 dB

• Equivalent Input Noise (EIN): -108dB max

• Phase Shift: <10 degrees (20 Hz - 20 kHz)