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DATA SHEET

MS 1a
MICROPHONE STAGE

General Description
The Rane MS 1a Mic Stage preamplifier provides the answer when you need just one microphone input in an otherwise line-level world. Give us a call to go from either a dynamic, condenser or electret microphone to a line-level input with a minimum of noise, distortion, cost and hassle. The MS 1a provides 48 V switchable Phantom Power with indicator LED, continuous rotary Gain trim between 21.5 dB and 66 dB, Signal/Overload LED, and XLR balanced Input & Output connectors. A Polarity switch and high-current crosscoupled output line driver round out the features. The MS 1a 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 1a guarantees performance usually found only in mixing consoles costing thousands of times as much. Of course, for all of that extra money you receive a proportional increase in KPSI (knobs per square inch).

Features · · · · Gain Control Signal and Overload Indicators Polarity Switch Switchable 48 V Phantom Power · · · · Ultra Low Noise Design True Differential Input Cross-Coupled Line Driver UL/CSA/CE and 100/120/230 VAC Remote Power Supply

Data Sheet-1

MS 1a
MICROPHONE STAGE

Features and Specifications
Parameter Input Impedance Gain Range Phantom Power ..........Impedance ..........Load Regulation ..........RMS CM Noise Max. Input Level ..........Max. Input Level Equivalent Input Noise Signal to Noise Ratio Dynamic Range CMRR Frequency Response ..........Gain 60 dB ..........Gain 21.5 dB THD+Noise (gain 60 dB) THD+Noise (gain 21.5 dB) Line Driver Max. Output Level Output Impedance Signal Indicator Overload Indicator Output Cable Length Unit: Agency Listing ..........120 VAC model ..........230 VAC model Power Supply: Agency Listing ..........120 VAC model ..........230 VAC model ..........100 VAC model Power Supply Input Max Current Consumption Unit Size ..........Weight Shipping Size ..........Weight Specification 10k 21.5 to 66 +48 6.81k 0.1 .003 +4.5/-34 -1.5/-40 -129 96 95/118 80 55 to 100k 40 to 100k .007 (Output=+20 dBu) .001 (Output=+20 dBu) Active Cross-coupled +20/+26 50 2/8 14/20 300 Class 2 Equipment UL & CSA CE-EMC CE-Safety UL CSA CE-EMC CE-Safety Built to JIS 18 VAC w/center tap 220 1.65" H x 5.1" W x 4.25" D 1 lb 3.6" H x 11.75" W x 7.2" D 4 lb Limit 1% typ. 4% 1% typ. typ. min. min. 1 1 typ. typ. typ. typ. typ. typ. min. 1% typ. typ. typ. Units ohms dB volts ohms % % dBu dBu dBu dB dB dB Hz Hz % % dBu ohms dBu dBu meters Conditions/Comments Balanced 5k + 5k 10 mA max. Each leg 0 to 14 mA % of Vout (10 to 10k Hz) Gain 21.5/60, balanced output Gain 21.5/60, unbalanced output 20 kHz BW, Rs=150 ohms, Gain = 60 dB 20 kHz BW, Rs=150 ohms, Gain = 21.5 dB, re 4 dBu Gain 60/21.5 Rs=150 ohms, 1 kHz +0, -3dB +0, -3db 20 to 20k Hz, 80 kHz BW, Rl=10k ohms 20 to 20k Hz, 80 kHz BW, Rl=10k ohms Gain 5.2/6 dB typ. unbalanced/balanced Unbalanced/balanced, 2k ohm load Each Leg Unbalanced/balanced output, Green LED Unbalanced/balanced output, Amber LED Belden 8451 or equivalent National Electrical Code Exempt Class 2 equipment EMC directive 89/336/EEC Exempt per Art. 1, LVD 73/23/EEC Class 2 Equipment File no. E88261 File no. LR58948 EMC directive 89/336/EEC LV directive 73/23/EEC Japan only Rane RS 1 supplied (4.2 cm x 13 cm x 10.8 cm) (0.45 kg) (9.5 cm x 30 cm x 18 cm) (1.8 kg)

10%

Vrms mA

Data Sheet-2

MS 1a
MICROPHONE STAGE

Block Diagram

Application Information
Uses and applications for the MS 1a should be obvious. But then again, its 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 1a might not be wasted. BALANCED USE The MS 1a 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 1a 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. When you must drive an unbalanced device with the MS 1a's balanced output, connect pin 2 to the "+" or "hot" lead, and tie pin 3 and ground together at the shield.

MIXING The MS 1a 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. In rides the MS 1a to the rescue. DIGITAL RECORDING AND SAMPLING Another handy use for the MS 1a 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. Such irony. Using the ultra low noise MS 1a to bring the mic inputs up to extremely high quality line-level is an easy and affordable solution for this dilemma. No garbage in; no garbage out. Clippity-clop; clippity-clop. MICROPHONE TYPES The available gain range of the MS 1a allows the use of virtually any type of microphone. True 48V phantom power guarantees the MS 1a works with every microphone. The better the mic, the better the MS 1a sounds. Ah, the sound of the thundering hoofs is deafening.

Data Sheet-3

MS 1a
MICROPHONE STAGE

Architectural Specifications
The microphone preamplifier shall be a single channel stand-alone unit with remote power supply. The power supply shall be U.L. listed, C.S.A. certified, and CE certified. The input and output shall be fitted with XLR connectors. A polarity inverting switch shall be included. Phantom power shall be provided in compliance with DIN 45596 & IEC 26815 and be controlled by a slide switch with an LED indicator. A gain control shall be provided with 21.5-66 dB adjustment range. Power, system signal and overload indicators shall be provided. 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 1a Microphone Stage. CHASSIS GROUNDING 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. Please refer to RaneNote 110, "Sound System Interconnection" (supplied in your manual and available on request separately) for further information on system grounding.

©Rane Corporation 10802 47th Ave. W., Mukilteo WA 98275-5098 TEL (425)355-6000 FAX (425)347-7757 WEB http://www.rane.com

Data Sheet-4

All features & specifications subject to change without notice DOC 103262 PN 10564 7-99