Set it and forget it! Our ELOP® Limiters make 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. Ours 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 our super-clean single-ended vacuum tube line amplifiers in the Manley unit, and 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, although now with the addition of a very useful sidechain high-pass filter that can switch between 100Hz or 200Hz (or OUT) to allow the limiter to ignore heavy bass lines, the ELOP® limiter is proving more useful for modern urban music where you dont want the limiter only responding to the loudest thing i.e., the BIG bass. If you want the bass line to leave the rest of the mix alone, then this switch is for you !
Product history versions:
The first Manley Electro-Optical Limiters were built back at the VTL factory and had green printed circuit boards and black billet chassis and faceplates. These units carried a serial number prefix of MANOPTO###. The oldest Manley Blue faced units in our standard extruded sides chassis with perforated top and bottom covers built prior to 1997 with serial codes MANELOP®### were unbalanced I/O only. Serial codes MELOP®B### are units with the Manley input and output transformers, although you still can use the transformerless inputs and outputs if you use the 1/4" TRS jacks.
In October 2000 after unit MELOP®565 we ditched the superfluous "balance control" and put the handy side chain filter in its place. October 2004 the engraving is changing to reflect this product's official new name: MANLEY ELOP® (registered trademark).