MARQUETTE AUDIO LABS

* Since 1994 *

Langevin ELOP Stereo Electro-Optical Limiter


Set it and forget it! The Manley Langevin ELOP® Limiter makes your job easy. The principle of operation is based around using a rectified sample of the audio to shine an LED (Light Emitting Diode) onto an LDR (Light Dependent Resistor). The photo-resistor in combination with a fixed resistor simply act as a changing voltage divider to attenuate the signal -- like a smart volume control. A similar principle was found in the older Teletronix®** & Urei LA-2A®**, LA-3, and LA-4 units which used a slower electro-luminescent panel-light on a conventional LDR encased in a light-tight enclosure. The new Manley-built Langevin ELOP Limiter uses modern VACTROL technology (but with a trick!) for exact sample-to-sample tracking and no high frequency loss while digging deep into limiting -- problems commonly associated with older LA-series limiters and other opto-based units.

The audio signal passes only through all-discrete Class A amplifiers in the Langevin version. Each channel can be run separately or switched to "stereo - link". Due to their inherently quick attack, these Electro-Optical Limiters are skilled soldiers for tracking vocals or individual instruments.


Audio Path: ALL DISCRETE
Inputs/Outputs: Balanced XLR & Unbalanced 1/4"
Input Attenuators: Silent Conductive Plastic
Max. Gain Reduction: 22dB
Attack Time: 10mS for 6dB GR
Release Time: 2.5 Seconds for 6dB GR
Bypass Switches: Yes
VU Meters: Sifam Meters, Read Output OR Reduction
Stereo Link Switch: Yes
THD @1Khz: <0.015%
S/N Ratio: 126dB
Gain: -2dB to 12dB (adjustable)
Power Consumption: 24 watts (120V/240V AC). Factory set for 100V, 120V or 220-240VAC operation for original destination country's mains voltage. Operating Mains Voltage changeable with power transformer changeover switch and fuse value change.
Mains Voltage Frequency:  50~60Hz
Dimensions: 19" x 1 3/4" x 10" (occupies 1u)


Langevin was one of the original pro audio manufacturers dating back to WWII. In that era there were far fewer audio manufacturers and Langevin gear was very popular and especially respected in the broadcast industry. There were very few recording studios then and most of them relied on Langevin, Altec, Fairchild, and other great brands as well as home-made gear. Early Langevin equipment was vacuum tube based and later became mostly discrete transistor based. Today, you can often find vintage Langevin pieces still in use after all this time.

The mic preamplifier and EQ borrow some ideas from the old circuits but are not identical to the old circuits at all. Manley Labs designed new gain blocks to deal with the balanced/unbalanced saga better than they used to in the olden days. Transistors, pots and most components have become significantly improved over the last 30 years. The limiter is a blend of the old discrete style of Langevin discrete and the also vintage "LA" series of Levelling Amplifiers. Manley developed a similar opto-based limiter and has used it in the Manley ELOP® Limiter, Langevin ELOP® Limiter, Langevin Dual Vocal Combo, and the VOXBOX® limiter / de-esser section.

The Manley units are all-tube while the Langevin units have all-discrete make up gain amplifiers. The EQ or limiting and metering sections are all the same Manley-to-Langevin. Your choice becomes between the sound of discrete transistor cicuitry in the Langevin gear or vacuum tubes with and without transformers in the Manley gear. Different flavours, but all build side-by-side with all high quality parts and reliable construction techniques at the Manley Labs factory.


LIST PRICE: $1,775
Please call Dave at (510) 581-3817 for product information and your price.

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