Manley ELOP+
Stereo Optical Limiter


The Manley ELOP+ is a tracking staple for the studio. Its quick grab tames vocals while the gentle slow release characteristic keeps it natural like a hand on a fader. Unique for this type of limiter, high frequency extension is retained even when digging deep. Built rugged and reliable, the Manley ELOP+ is often seen FOH on the superstar’s lead vocal at concerts all over the world. 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 ELOP+ uses modern VACTROL technology  for exact sample-to-sample tracking and no high frequency loss while digging deep into limiting.

The audio signal passes only through our 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 quick attack, these Electro-Optical Limiters are skilled 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 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.

Manley Laboratories ELOP+ Specifications:

  • ALL-TUBE audio path 12AU7WA + 6414 per channel
  • Unbalanced 1/4" Inputs And Outputs and
  • Balanced Transformer Coupled XLR Inputs And Outputs
  • Hi-current drive <50 Ohm 1/4" & XLR outputs
  • Silent conductive plastic INPUT attenuators
  • ATTACK time: 10mS for 6dB GR
  • RELEASE: 2.5 Seconds for 6dB GR
  • Maximum Input (Bypass through Line Amplifier) +30 dBv (with Limit "IN" the maximum is entirely variable)
  • Maximum Output +30 dBv
  • Headroom (referenced to +4 dBv) 26 dB
  • Frequency Response: 10 Hz to 70 kHz +/- 0.5 dB
  • Bypass switches and automute w/ warmup delay
  • Large illuminated Sifam VU meters
  • Meters switch to read OUTPUT or REDUCTION
  • Stereo Link
  • Side-Chain High-Pass Filter 100Hz or 200Hz
  • THD & Noise (1kHz @ +4 dBm): .015%
  • Noise Floor (Gain set to minimum): -80 dB Wideband
  • Signal to Noise Ratio: 126 dB typical
  • Maximum gain: 15 dB
  • Power consumption: 40 watts
  • Operating mains voltage: Units are purpose built for original destination country's mains voltage: 100V, 120V, or 220-240VAC asindicated on the serial number badge. Power transformer must be replaced inorder to change mains operating voltage. 120VAC units may NOT be rewired to put the primaries of the power transformer in series for 220-240V operation ora large radiated field of hum will develop. If changing locations/voltages, the power transformer must be replaced with the dedicated one for the voltageat which it will operate.
  • Mains Voltage Frequency: 50 ~ 60Hz
  • Dimensions: 19" x 3 1/2" x 10" (occupies 2u)
  • Shipping weight: 16 lbs
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