| info from raven labs website
Raven Labs PMB-II
The PMB-II (Professional Master Blender) from Raven Labs provides the professional musician the ultimate device in blending together two separate signal sources. It can be used with an acoustic guitar or bass having a piezo pickup and soundhole microphone, a stereo instrument, two separate instruments or keyboards, or an instrument and drum machine, tape deck, etc. Of course, it also makes a great preamp for any single instrument. The PMB-II features 6dB more gain per channel than its predecessor (the PMB-1) as well as improved phantom power filtering.
Great care has been taken in the selection of components and impedances to insure crystal clarity, wide frequency response, low noise and minimum distortion. As well, the unit is packed with useful features.
The PMB-II can be powered with two nine-volt batteries, or a wall mounted A/C adapter (sold separately). One A/C adapter is capable of powering several models from Raven Labs.
Each unit comes with a 3 year guarantee against parts and workmanship.
Front Panel Features
Instrument Channel Input.
Auxiliary/Microphone Input.
Stereo Input (Tip = Instrument Channel, Ring = Aux/Mic Channel).
Phase switch for both channels.
Gain, Bass, Mid, and Treble Controls for each channel.
Nine Volt "phantom" power switch for the Mic channel.
Master Effects Blend (side chain effects loop).
Master Volume Control.
Mute Switch with Red LED indicator.
Power Switch with Green LED indicator.
Rear Panel Features
A/C adapter In and Out jacks
Dual 9 volt battery holder.
XLR balanced out.
Ground Lift switch for the XLR connector.
Individual Channel Patch jacks.
Master Effects Send jack.
Master Effects Receive jack.
Line Output jack.
Tuner Send jack.
Specifications
*All measurements taken with fresh 9 volt batteries.
Power source: Dual 9 volt batteries. Over 60 hours life expectancy under normal use. Optional A/C wall adapter is available.
Frequency Response:
Instrument Channel: -3dB from 10Hz to 35KHz.
Auxiliary/Microphone Channel: -3dB from 30Hz to 35KHz.
Distortion: Less than 0.005% @ 1KHz, both channels.
Noise: -85dB typical (Tone Controls set in "flat" position).
Gain: 12X (21.5dB) each channel. Tone Controls: +/- 12dB per band.
Maximum Input level: 2 volts RMS.
Input Impedance:
Instrument Channel: 10 Meg Ohms.
Aux/Mic Channel: 820K Ohms.
Maximum Output Level: 6 volts RMS.
Output Impedance: Line Out, Tuner Out, Effects Send: 100 Ohms.
Resistors: 1%, 1/4 watt. Capacitors: Mylar (German Wima).
Chassis: Steel, powder coated Burgundy
Size: 6.7" W x 2.26" H x 6" D.
Weight: 3 lbs. | 
