Langevin ELOP
Dual Channel ELOP® Electro-Optical Limiter
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The Langevin ELOP follows the tradition of the vintage LA-3A Leveling Amplifier. Using a passive elctro-optical device to control gain to eliminate the need to push music through many tansistors or ICs.
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The Langevin ELOP Dual Channel ELOP® Limiter :
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 Langevin ELOP 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.
- ALL-DISCRETE audio path
- Balanced XLR inputs & outputs and...
- Unbalanced 1/4" inputs & outputs
- Silent conductive plastic INPUT attenuators
- Max. GAIN REDUCTION 22dB
- ATTACK time 10mS for 6dB GR
- RELEASE: 2.5 Seconds for 6dB GR
- BYPASS switches
- Sifam VU METERS
- Meters switch to read OUTPUT or REDUCTION
- STEREO LINK switch
- <0.015% THD @1Khz
- S/N Ratio: 126dB
- Gain: -2 dB to 12 dB (adjustable)
- Power consumption (120/240VAC): 24 watts
- Dimensions: 19" x 1 3/4" x 10" (occupies 1u)
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