Manley Electro Optical Limiter (LA2A type) Stereo

Set it and forget it! The Manley ELOPTM Limiter makes things 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, a kind of intuitive volume control. A similar principle was used in old 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 Manley ELOP uses modern VACTROL technology (with a twist) for exact sample-to-sample tracking and no high frequency loss whilst limiting heavily, a problem commonly associated with older LA-series limiters and other opto-based units..

The audio signal passes only through super-clean single-ended vacuum tube line amplifiers in the Manley unit, and through all-discrete Class A amplifiers in the Manley Langevin version. Each channel can be run separately or switched to stereo link. Due to their inherently quick attack, these Electro-Optical Limiters are excellent 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 ELOPTM limiter is proving more useful for modern urban music where it is not desirable for the limiter to respond to the loudest thing only. IE: the BIG bass. If you want your bass line to leave the mix alone, this is the switch for you.

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