User manual RANE MS 1B

[. . . ] A Polarity switch and high-current cross-coupled output line driver round out the features. The MS 1b utilizes one of the finest ultra low noise amplifier designs available. Featuring a true differential input with high common-mode rejection, use of the MS 1b guarantees performance usually found only in mixing consoles costing thousands of times as much. [. . . ] Each leg 0 to 14 mA % of Vout (10 Hz to 10 kHz) Gain 18 / 60, balanced output 20 kHz BW, Rs=150 , Gain = 60 dB 20 kHz BW, Rs=150 , Gain = 18 dB, re 4 dBu Gain 18 / 66 Rs=150 , 120 Hz, Gain = 60 dB Conditions/Comments Balanced 5k + 5k Data Sheet-2 MS 1b MICROPHONE STAGE Block Diagram +48 V PHANTOM POWER SIGNAL / OVERLOAD INVERT MIC INPUT 3 1 2 RFI FILTER +6 dB LINE LEVEL 2 3 OUT 1 GAIN 12-60 dB Application Information Uses and applications for the MS 1b should be obvious. But then again, it's obvious to us our taxes are too high and nothing is being done about that. With this in mind, perhaps a few words on using the MS 1b might not be wasted. BALANCED USE The MS 1b provides a true cross-coupled balanced output. This is equivalent to an electronic simulation of a transformer output. Rane follows the AES standard of pin 2 = hot. When running a long cable back to the mixer, run a linelevel balanced line rather than a mic-level line. The compact MS 1b can mount closer to the microphone, provide a local volume control (or not, just pull the knob off), while the stronger signal minimizes RF and hum irritations. UNBALANCED USE Balanced use is recommended to minimize noise. Unbalanced lines are usually quiet under 10 feet (3 meters), but longer runs will introduce the hum and interference you are trying to avoid. When you must drive an unbalanced device with the MS 1b's balanced output, keep the cable short, and connect pin 2 to the "+" or "hot" lead, and tie pin 3 and ground together at the shield. MIXING The MS 1b is designed to fill the need for adding a microphone channel to line-level mixers, such as the Rane SM 26B or SM 82. Many installations using either of these products invariably wind up with one unused input that would do the job perfectly if only it could operate at mic-level. DIGITAL RECORDING AND SAMPLING Another handy use for the MS 1b is in recording applications. Many popular products do not have a high enough quality mic preamp to suit the resolution of the digital processing electronics. Using the ultra low noise MS 1b to bring the mic inputs up to extremely high quality line-level is an easy and affordable solution for this dilemma. MICROPHONE TYPES The available gain and large input range of the MS 1b allows the use of virtually any type of microphone. [. . . ] High current cross-coupled active output line driver shall be standard, as well as input RFI filter protection. The unit shall be a Rane MS 1b Microphone Stage. Chassis Grounding Note Units with outboard power supplies do not ground the chassis through the line cord. Make sure that these units are grounded either to another chassis which is earth grounded, or directly to the grounding screw on an AC outlet cover by means of a wire connected to a screw on the chassis with a star washer to guarantee proper contact. [. . . ]