Manley ELOP+



Since the early 1990’s, the Manley ELOP® stereo electro-optical limiter has been a tracking hero – effortlessly controlling dynamics on countless records around the globe and delivering the coveted classic, all-tube sound for which Manley Labs is known. This LA-2A type unit allows for deep amounts of limiting without loss of high frequencies: it literally works (and sounds) like a changing volume control.

The original was super easy to use, with supremely natural sound, and has often been the perfect choice for superstar vocals.

So how do you improve on something this good?

The original Stereo ELOP®, or Electro Optical Limiter, was one of the first Manley products from the early 1990’s. With its through-hole printed circuit board construction and hours of tedious hand-looming, it sure looked like 1992 inside the chassis.

The unit was scrubbed for buildability, embracing modern production techniques. Importantly, the power supply was upgraded to Manley’s proprietary MANLEY POWER™ universal voltage Switch Mode Power Supply, which lowered the noise level and made the unit a true world-traveler.

Manley also added a 3:1 compression ratio feature which opens up the doors to greater versatility, especially for 2-buss applications. With careful reference to their sonic past, they have deployed their highest performance vacuum tube line amplifier and White Follower output stage in this new version, all housed in a build-efficient chassis behind a drop-dead gorgeous precision-CNC-milled faceplate – all proudly made in America, of course. The new Manley ELOP+ is everything you love about the legendary ELOP, plus!


  • GAIN CONTROL: Available on L and R channels. Adjusts the gain of the audio channel, with unity at about the 7th marking (1 o’clock). Limiting usually requires some make-up gain to compare IN / BYPASS. The Gain control can also be used as the level to tape.
  • REDUCTION CONTROL: Available on L and R channels. Reduction adjusts the amount of limiting or compression in that channel. This could also be called “threshold”. Turning this control clockwise increases the amount of limiting or compression.
  • VU METER: One for each channel, showing the gain reduction in dB when switch #7 is deselected, and showing output level in dB when switch #7 is engaged and illuminated.
  • HP SC CONTROL: Inserts a high-pass filter into the sidechain circuit, reducing the amount of compression or limiting below 80 Hz. Note: this filter is changeable to 150 Hz via an internal jumper. See the manual for details.
  • IN / BYPASS CONTROL: If the switch is engaged & illuminated, audio will pass through the limiter / compressor circuit and all front panel controls will function. If the switch is disengaged, audio still flows through the tubes in the unit, but at Unity Gain with no compression or limiting.
  • COMPRESS / LIMIT CONTROL: This switch allows the ELOP+ to use two different compression ratios. Offering either compression at approximately 3:1 when the switch is engaged and illuminated, or limiting at approximately 10:1 when the switch is disengaged.
  • METER SELECT: Allows the user to monitor either Gain Reduction (switch engaged & illuminated) or Output of the unit (switch disengaged).
  • POWER SWITCH: Glows DIM when an IEC power lead is connected to the unit. This indicates that the ELOP+ is in STANDBY mode. Engaging the switch takes the ELOP+ out of standby mode and into warm-up mode (flashing VU meters, brighter glowing power switch). This lasts 30 seconds, after which the MUTE relays will lift and the VU meters will stop flashing.
  • LINK / STEREO FUNCTION: When the LINK switch is engaged and illuminated, the ELOP+ applies the same amount of gain reduction to both the L and R channels. This is done to prevent image shifting that can occur if each channel is compressed individually. It is suggested that when in LINK mode both channels have controls set the same. Please see the ELOP+ manual for more details.
  • 10:1 Limiter and 3:1 Compressor ratios
  • All-tube audio path uses 5751 (gain) and 6922 (White Follower Output) dual triodes each channel
  • Balanced Manley IRON® transformer-coupled XLR Inputs
  • XLR impedance-balanced outputs
  • BYPASS switches and AUTOMUTE with warm-up delay
  • Large illuminated VU meters read Gain Reduction or Output levels
  • Side-Chain High-Pass Filter
  • Standby Power Consumption: 0.5 Watts
  • Universal internal power supply operates worldwide: 90-250V~AC 50/60Hz
  • ALL-TUBE audio path using a 5751 for gain, 6922 White Follower output tube (one each per channel)
  • Silent Conductive Plastic GAIN control.
  • Balanced MANLEY IRON Transformer coupled XLR input.
  • Input impedance: 14 kOhms
  • Maximum input level: +18dBu or 4.8V RMS @ 0.01% THD
  • Hi-current White Follower Impedance Balanced XLR output.
  • Output impedance: 150 Ohms
  • Maximum Output with 100 kOhm load: +30dBu @.009%THD+N, BW 22Hz-22Khz, 1Khz sine
  • Maximum Output with 600 Ohm load: +20dBu @.015%THD+N, BW 22Hz-22Khz, 1Khz sine
  • Output Headroom (Referenced to +4dBu): 26dB
  • Frequency Response: -0.15dB @ 10Hz, -0.1dB @ 20KHz
  • Total Harmonic Distortion (1kHz sine @ +4dBu, BW 22Hz-22kHz): 0.004 % THD+N
  • Noise Floor Limiter Bypass: -90dBu (BW 22Hz-22kHz)
  • Noise Floor Limiter Engaged: -88dBu (BW 22Hz-22kHz) Input set to Unity gain
  • Dynamic Range: 118dB
  • Signal to Noise Ratio: 92dB (Referenced to +4dBu)
  • Bypass mode: Signal goes thru ALL-TUBE audio path (Bypasses limiter) this is not a “hardwire bypass”
  • Unity Gain: Set Input Attenuator @ 1:00 o’clock
  • Maximum Gain: 13 dB
  • Common-Mode Rejection Ratio (CMRR): 77dB (BW 22Hz-22Khz, +4dBu, 1Khz sine)
  • Limiter Ratio: 10:1
  • Compressor Ratio: 3:1
  • Limiter Attack: 15ms
  • Limiter Release: 200ms
  • Compressor Attack: 75ms
  • Compressor Release: 200ms
  • Attack/Release times measured under following conditions: 4dB of Gain Reduction, 1kHz sine, +4dbu Input level, to 63% of total.
  • Attack times are faster with higher input levels and heavier gain reduction. Typically for complete release, release times increases up to a couple of seconds, depending upon the amount of previous reduction.
  • Maximum Limiting (with +4dBu 1Khz sine): 12dB
  • Maximum Compression (with +4dBu 1Khz sine): 6dB
  • Side-Chain High Pass Filter: 80Hz (Internal user adjust jumper to 150Hz)
  • Automute warmup delay: 30 seconds
  • Operating mains voltage: 90 to 254 VAC (internal universal power supply)
  • Mains voltage Frequency: 50-60 Hz
  • Power consumption: 26 Watts
  • Dimensions: (w,d,h) 19″ x 7 x 3 1⁄2″ (occupies 2u)
  • Unit weight: 9.5 Ib
  • Shipping weight: 10 Ib