Manley Labs ELOP+ Electro-Optical Vacuum Tube Limiter/Compressor

Manley Labs ELOP+ Electro-Optical Vacuum Tube Limiter/Compressor

Manley Labs ELOP+ Electro-Optical Vacuum Tube Limiter/Compressor

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Manley Labs ELOP+ Electro-Optical Vacuum Tube Limiter/Compressor

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Product Highlights

  • Useful for Tracking Instruments & Vocals
  • Dual Channel with Stereo Linking
  • All-Tube Audio Path
  • Electro-Optical Attenuation Circuit
  • Capable of Transparent Compression
  • Approximate Ratios of 3:1 and 10:1
  • Sidechain High-Pass Filter at 80 Hz
  • Level and Gain Reduction Meters
  • Internal Power Supply
  • 2 RU
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This item is noncancelable and nonreturnable.

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Manley Labs ELOP+ overview

  • 1Description

With iron-balanced, transformer-coupled inputs, an all-tube audio path, and an electro-optical attenuation circuit, the Manley ELOP+ is a dual-channel compressor and limiter. It’s capable of achieving pleasing dynamic-taming results in the studio, especially when tracking vocals or instruments.

The ELOP+ follows in the footsteps of heralded studio levelers such as the UREI LA-2A, providing relatively few controls in comparison to many other compressors: there are no attack, release, or knee controls. Instead, you are presented with a reduction-control knob, make-up gain, and a button to switch between a 3:1 and 10:1 ratio—though these are approximations, as they are highly sensitive to the material fed into the compressor. These streamlined controls allow you to attain sonically desirable compression in a straightforward manner: Simply select a preferred ratio, set the threshold to achieve the amount of gain-reduction you’d like to effect (along with your ears, you can use the meters provided for a visual aid), and adjust the make-up gain to taste.

Both channels sport their own gain, ratio, bypass, and reduction controls, with each channel providing a high-pass sidechain button; this prevents frequencies below 80 Hz from effecting the signal. Both channels sport their own VU meters, which can be switched to indicate gain reduction or overall output level.

If you’re routing a stereo source through the ELOP+, you might want to make use of the stereo/link button, which will prevent your stereo image from wandering when one channel becomes louder than the other. The unit, occupying 2 RU of rack space, comes with its own internal power supply specifically calibrated to handle its complement of tubes. Suggested uses of this compressor include vocals, bass, guitar, brass, woodwinds, and synthesizers, upon which the ELOP+ can impart transparent and subtle dynamics-taming. The compressor is also suitable for room mics used to capture drum kits.

Controls Explained
  • Gain Control: This control is available on both the left and right channels, and adjusts the gain of each audio channel. Unity gain is at about the seventh marking, or 1 o'clock. Limiting usually requires some additional make-up gain to compare with signal in a disengaged (bypassed) state. The Gain control can also be used as the level to tape.
  • Reduction Control: This control is available on both the left and the right channels, and adjusts the amount of limiting or compression in a channel. This could also be thought of as a threshold control. Turning this control clockwise increases the amount of limiting or compression.
  • High-pass Sidechain Control: This is factory-set at 80 Hz. When this switch is engaged and illuminated, everything above 80 Hz will have the effect of limiting or compression, while every frequency at 80 Hz or below will not affect the compressor. This is useful if you want the bass to come through with full impact while applying the limiter/compressor to everything else. This filter frequency may be set to a slightly higher frequency of 150Hz by changing the internal HPSC filter select jumper. For more information on how to do this, please consult your manual.
  • In / Bypass Control: This switch dictates whether your audio flows through the Limiter/Compressor or just straight through the unit. If the switch is engaged and illuminated to the "IN" position, the audio will pass through, and gain reduction will occur. When this switch is set to "BYPASS" the audio still flows through the tubes in the unit, but at unity gain, and without any gain reduction. Use this switch to verify that the limiting or compressing is not messing up the original sound, but enhancing it, or at least leveling the volume. Alternatively, you might like the tonal characteristics this unit, left in bypass, imparts on your mix.
  • Compress / Limit Control: This switch allows the ELOP+ to use two different compression ratios. The compression ratio is approximately 3:1 when the switch is engaged and illuminated, and approximately 10:1 when set to limiting.
  • Meter Select Switch: This allows the user to monitor either gain reduction or the output of the unit. When the switch is engaged and illuminated, the output of the channel you are monitoring is visible in the corresponding VU Meter.
  • Link / Stereo Function: When this switch is engaged, the ELOP+ applies the same amount of gain reduction to both the left and right channels. This is done to prevent stereo-image shifting, which can occur if each channel is compressed individually. It becomes noticeable when a loud element that is panned to either edge of the stereo field raises the level of the program to the compressor's threshold, causing its image to shift toward the center of the stereo field. It is important to note that in Link mode, there is no "Left Channel Master". Each control still works independently of each other. Stereo is used on stereo tracks, so if either channel is called to limit, both channels reduce the same amount at the same time. This prevents image shifts and an instrument should stay where you panned them.
Features at a Glance
  • 10:1 limiter and 3:1 compressor ratios
  • All-tube audio path uses 5751 and 6922 dual triodes
  • Balanced Manley IRON transformer-coupled XLR inputs
  • XLR impedance-balanced outputs
  • Large illuminated VU meters read gain reduction or output levels
  • Stereo linking
  • Sidechain high-pass filter at 80 Hz, user-adjustable to 150 Hz
  • Universal internal power supply
In the Box
Manley Labs ELOP+ Electro-Optical Vacuum Tube Limiter/Compressor
  • Limited 90-Day Warranty (5 Years When Registered within 30 Days of Original Purchase)
  • Table of Contents
    • 1Description

    Manley Labs ELOP+ specs

    Tubes 5751 for gain, E88CC / 6922 white follower
    Input Attenuator Silent conductive plastic
    Maximum Input Level 18 dBu or 4.8 V RMS @ 0.01% THD
    Input Connector 2 x balanced transformer-coupled XLR inputs
    Output Connector 2 x impedance-balanced XLR outputs
    Input Impedance 14 kOhms
    Output Impedance 150 Ohms
    Maximum Output 22 Hz to 22 kHz bandwidth; 1 kHz sine
    30 dBu @ 0.009% THD+N, 100 kOhm Load
    20 dBu @ 0.015% THD+N, 600 Ohm Load
    Headroom Output, Referenced to 4 dBu: 26 dB
    Frequency Response -0.15 dB @ 10 Hz; -0.1 dB @ 20 kHz
    THD 0.004% THD+N (1 kHz sine @ 4 dBu, 22 Hz to 22 kHz bandwidth)
    Noise Floor Limiter with Input Set to Unity Gain:
    Bypass: -90 dBu
    Engaged: -88 dBu
    Dynamic Range 118 dB
    Signal to Noise Ratio 92 dB (referenced to +4 dBu)
    Maximum Gain 13 dB
    CMRR 77 dB (BW: 22 Hz to 22 kHz, 4 dBu, 1 kHz sine)
    Ratio Limiter: 10:1
    Compressor: 3:1
    Limiter Attack: 26 ms
    Release: 200 ms
    Maximum Limiting with 4 dBu, 1 kHz Sine: Approximately 12 dB
    Compressor Attack: 75 ms
    Release: 200 ms
    Maximum Compression with 4 dBu, 1 kHz Sine: Approximately 6 dB
    High-Pass Filter Sidechain: 80 Hz, internal user adjust jumper to 150 Hz
    Warm-Up Period Automute Warmup Delay: 30 sec
    Operating Voltage 90 to 254 VAC (internal universal power supply); 50/60 Hz
    Power Consumption 26 W
    Rackmount Space 2 RU
    Dimensions 19.0 x 3.5 x 7.0" / 48.3 x 8.9 x 17.8 cm
    Weight 11 lb / 5 kg

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