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OWNER'S MANUAL
LANGEVIN
DUAL VOCAL COMBO
MANLEY
LABORATORIES, INC.
MANUFACTURED BY:
MANLEY LABORATORIES, INC.
13880 MAGNOLIA AVE.
CHINO, CA. 91710 USA
TEL: (909) 627-4256
FAX: (909) 628-2482
email:emanley@manleylabs.com
http://www.manleylabs.com
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CONTENTS SECTION PAGE INTRODUCTION 3 FRONT PANEL 4, 5 BACK PANEL 6 MIC PRE BASICS 7 CONNECTING YOUR PREAMPLIFIER 8, 9 OPERATION NOTES 10, 11 SPECIFICATIONS 12 TROUBLESHOOTING 13, 14 INTERNAL ADJUSTMENTS 15 REPLACING FUSES AND METER LAMPS 16 MAINS CONNECTIONS 17 WARRANTY 18 WARRANTY REGISTRATION 19 APPENDIX A: WIRING YOUR OWN CABLES 20 APPENDIX B: TEMPLATE FOR STORING SETTINGS 21
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INTRODUCTION THANK YOU!... for choosing the Langevin Dual Vocal Combo. Manley Labs bought all the rights to the Langevin name and circuits in 1992. Manley uses the Langevin name for its solid state products including versions of an all discrete Pultec and Electro-Optical Limiter, and Mic Preamp. The Dual Vocal Combo is the result of a suggestion to combine the "Langevin Dual Mono Microphone Preamplifier with EQ" with the "Langevin Dual-Channel Electro-Optical Limiter" for a competitively priced
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A B C D E F G H I H G F E D C B A POWER POWER INPUT INPUT 80 80 Hz Hz L.F. L.F. EQ IN EQ IN H.F. H.F. 12 KHz 12 KHz 80 80 Hz Hz L.F. L.F. EQ IN EQ IN H.F. H.F. 12 KHz 12 KHz INPUT INPUT OFF OFF ON ON PHANTOM PHANTOM PHANTOM PHANTOM (PULLON) (PULLON) (PULLON) (PULLON) ATTENUATE ATTENUATE 40 40 Hz Hz -10 -10 +10 +10 EQ OUT EQ OUT -10 -10 +10 +10 8 8 KHz KHz 40 40 Hz Hz -10 -10 +10 +10 EQ OUT EQ OUT -10 -10 +10 +10 8 8 KH
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J) DIRECT INPUT. This is for plugging in an electric guitar, bass, synth, etc into the Dual Vocal Combo. The input impedance is high (150 kOhms) appropriate for these instruments and there should be plenty of gain available. Electric guitars and basses may need a fair amount of H.F. Boost to sound comparable to an amp because there happens to be a lot of H.F. boost going on in the innards of most amps. A jack plugged into this input will interrupt the normal mic XLR input. OPTO-LIMITER SECTIONS
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BALANCED BALANCED BALANCED BALANCED MIC IN OUT OUT AN AN EVEANNA MANLEY PRODUCTION EVEANNA MANLEY PRODUCTION OUT OUT MIC IN MIC IN LINE OUT LINE OUT LINE OUT LINE OUT UNBALANCED UNBALANCED UNBALANCED UNBALANCED ONLY ONLY ONLY ONLY MANLEY LABORATORIES MANLEY LABORATORIES 13880 MAGNOLIA AVE., CHINO, CA 91710 13880 MAGNOLIA AVE., CHINO, CA 91710 N9512423 N9512423 PHONE (909) 627-4256 PHONE (909) 627-4256 FAX FAX (909) 628-2482 (909) 628-2482 email: emanley@manleylabs.com email: emanley@manleyl
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MIC PRE BASICS This Microphone Preamp, like most mic preamps, is pretty easy to use. First we can discuss why outboard mic pre's have become "a must have item" in almost every studio even though your console probably has a bunch of them and that manufacturer claims that they are really great and you don't need outboard mic pre's. Then, why is everybody buying them, using them, and why are most people going back to tubes or vintage transistor based circuits? Good question. The signal from a typic
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CONNECTING YOUR PREAMPLIFIER Easy - Connect the mic to the Microphone Input XLR, then connect the Line Output to your tape machine or console. Read on, there are some things to consider. On the back panel are female XLR's labelled MIC INPUT A and MIC INPUT B. The signal from the MICROPHONES get plugged in here. Here are a few warnings and suggestions. These XLR connectors also "send" PHANTOM POWER to the mics. Some mics can be damaged by the 48 volts of phantom power. A few PZMs and a few ribbon
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Reversing the polarity or phase is often needed when two or more mics are picking up the same source. For example it would be needed when one mics the top and bottom of a snare - one skin is going towards one mic and the other skin is going away from the other mic. If one signal is not "reversed" then you lose lows. Polarity reverse can also help with some vocal / mic / headphone situations because " somewhere " the polarity flipped one too many times. It happens. General advise - try it each wa
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OPERATION NOTES The Langevin Electo-Optical Limiter follows certain traits and traditions established by the UREI LA-3A and similar levelling amplifiers. These traits can be divided into two aspects - electronic and operation. The electronic concept is simple and rather clean. Use the audio to light up LEDs which shine onto photo-resistors. These photo-resistors in combination with a fixed resistor simply act as a voltage divider to attenuate the signal. The line amplifier only functions to pro
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The slope or ratio is also difficult to simulate. The initial ratio is low and becomes higher with more gain reduction until the leds light up fully and further reduction is not easy. This upper limit of reduction is in the area of 20 dB or at the bottom of the GR meter where the ratio becomes low again but this would be a severe setting that few engineers could use. Distortion becomes audible at very deep limiting. In a tech shop, it is easy to drive the limiter to 20 dB of reduction and beyond
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SPECIFICATIONS Frequency Response 20 Hz to 20 KHz (+/- 1 dB) Mic Pre 20 Hz to 50 KHz (+/- .5 dB) Limiter THD & Noise .075% (1Khz @ +4 dBm) Mic Pre .06% (1Khz @ +4 dBm) Limiter Signal to Noise ratio 107 dB Limiter Headroom 26 dB (ref +4 dBv) Limiter Maximum Output +30 dBv (75 volts p to p) Limiter Maximum Input (with Input at max) 70 mV mic, 800mV direct Maximum Gain (factory set for 45 dB) 38 dB to 53 dB (internal trimmer) Mic 25 dB Direct Instrument 1/4" input (knob set to 45 dB)(off to +40 dB
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TROUBLE-SHOOTING There are a number of possible symptoms of something not quite right, some may be interfacing, others we will touch on as well. The Dual Vocal Combo has a variety of balanced and unbalanced inputs and outputs optimised for typical standards and most problems are due to the right cable in the wrong jack. However if you suspect a problem the following paragraphs should help. NO POWER, NO INDICATORS, NADA - Probably something to do with AC power. Is it plugged in? Check the fuse on
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HUM - Let's assume it knows the words. Once again - several possibilities - several cures. Most likely it is a ground loop. The two most common procedures are: try a 3 pin to 2 pin AC adapter (about a dollar at the hardware store) which is better than messing up the power cable by bending the ground pin until it breaks off. Method two - cutting the shield on one side of the cable. This is usually done at every female XLR to "break" all loops. You may get a loop simply from the rack. All the ot
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INTERNAL ADJUSTMENTS 1 5 4 8 9 2 3 7 10 6 11 11 12 12 1) +36 Volt DC adjust with meter from ground to resistor marked by arrow. Check this first and adjust if needed. It is the power supply regulator adjustment. Now for the audio .... You will have to start out by setting front panel controls to these settings. BYPASS mode, SEP ( LINK OFF ), REDUCTION controls counter clockwise (MIN), GAIN to 1:00 or unity, Balance at 12:00. The top will need to be open. There are two screws on the top that hold
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REPLACING FUSES & METER LAMPS 1 2 A B Changing the fuse is easy and can be done without any tools and while the DVC is still in a rack. 1) Disconnect the IEC AC mains for safety 2) Rotate the fuse cap anti-clockwise 1/4 turn 3) Remove the fuse and replace it with a new 1 AMP, 250 VOLT, AGC1 type fuse 4) Reconnect the IEC AC mains, turn on the power and meter lamps should once again glow. If the new fuse also blows, it means there is probably a problem in the Dual Vocal Combo that needs fixing. F
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MAINS CONNECTIONS Your unit has been factory set to the correct mains voltage for your country. The voltage setting is marked on the serial badge, located on the rear panel. Check that this complies with your local supply. The voltage changeover switch is located inside the unit in the middle of the PCB near the power transformer. To change the voltage from 120 to 240 volts, simply remove the top cover by unscrewing the center fixing screw and sliding the top out towards the rear of the chassi
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WARRANTY All Manley Laboratories equipment is covered by a limited warranty against defects in materials and workmanship for a period of 90 days from date of purchase to the original purchaser only. A further optional limited 5 year warranty is available to the original purchaser upon proper registration of ownership within 30 days of date of first purchase. Proper registration is made by filling out and returning to the factory the warranty card attached to this general warranty statement, al
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WARRANTY REGISTRATION We ask that you please fill out this registration form and mail the bottom half to: MANLEY LABORATORIES REGISTRATION DEPARTMENT 13880 MAGNOLIA AVE. CHINO CA, 91710 or FAX to: (909) 628-2482 or email service@manleylabs.com with the info from below and a note that this is for warranty registration. There is also a service form at www.manleylabs.com that you can use. Registration entitles you to product support, full warranty benefits, and notice of product enhancements and up
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TEMPLATE -photocopy this page and use it to store settings POWER POWER INPUT INPUT 80 80 Hz Hz L.F. L.F. EQ IN EQ IN H.F. H.F. 12 KHz 12 KHz 80 80 Hz Hz L.F. L.F. EQ IN EQ IN H.F. H.F. 12 KHz 12 KHz INPUT INPUT OFF OFF ON ON PHANTOM PHANTOM PHANTOM PHANTOM (PULLON) (PULLON) (PULLON) (PULLON) ATTENUATE ATTENUATE 40 40 Hz Hz -10 -10 +10 +10 EQ OUT EQ OUT -10 -10 +10 +10 8 8 KHz KHz 40 40 Hz Hz -10 -10 +10 +10 EQ OUT EQ OUT -10 -10 +10 +10 8 8 KHz KHz ATTENUATE ATTENUATE DUAL VOCAL COMBO DUAL
