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HomepageMic PreampsPreamps/Compressor › Pendulum Audio Quartet
Pendulum Audio Quartet

The Pendulum Audio Quartet is a Tube Recording Channel Strip. The All-In-One Tracking Tool for High Resolution Recording.

The Quartet is an all-purpose recording tool designed with the ultimate in sound quality and flexibility in mind. We have combined four elements - Mic/DI preamp, Opto-compressor, EQ, and De-esser -into a fully integrated package that it makes it easy to track any source. In addition, the Mic/DI preamp, EQ and Compressor/De-esser are completely independent entities that can be patched out and used separately - a hand feature that makes it a valuable tool for mixing as well as tracking.

The Mic/DI preamp, borrowed from our acclaimed MDP-1, can handle mics, pickups, keyboards, or line-level signals. It features phantom power, input pad, phase reversal, and a switchable lo-cut filter. Independent gain and output controls permit overdrive of the tube stage to vary the harmonic content of the preamp.

The Opto-Compressor, derived from the popular OCL-2, uses our proprietary optoelectronic cell, and has a sound all its own. It can be used in one of four modes: Fast (for 'invisible' compression), Average (rms responding), a new Vintage mode (with program-dependent response), or full manual operation.

Our new 3 band tube EQ, a modifed Baxandall design, is simple but very effective. The HI and LO bands have up to ±10dB of shelving at 15, 10 and 7 kHz, and 50, 100 and 200 Hz respectively. The MID band has a broad ±10dB peaking response centered at 0.7, 1.6, 2.2, 3.3, 5.0 and 6.5 kHz. The EQ can be placed before or after the compressor with the flip of a switch.

The new De-esser, which is implemented within the opto-compressor, uses an entirely new approach. A highly selective inductor-based detector triggers a very fast opto-inductive notch filter. The user can control the depth of the notch, which in turn controls amount of sibilance to be removed. When not triggered, the de-esser is out of the signal path entirely.
Features
  • The tube Mic/DI Preamp from the MDP-1
  • The tube Opto-Compressor from the OCL-2 using our proprietary optoelectronic cell
  • A new three band tube EQ with HI and LO shelving and peaking MID band
  • A new de-esser design using opto-inductive filtering and a highly selective detector
  • The Mic/DI, EQ and Compressor/De-Esser can be patched out and used independently.
  • Transformerless or transformer-balanced main output
  • Gold-plated switch contacts, I/O connectors and tube sockets
  • Polypropylene caps and metal film resistors (pairs matched to 0.1%)
  • Fully regulated high voltage (300V) and filament and bipolar power supplies with soft-start warm-up and output muting
  • Custom toroidal power transformer with shield for minimum hum
  • 120V or 240V ac voltage switch on the rear panel.
  • Specifications
    Circuit Type: Class A vacuum tube topology with transformerless or transformer-balanced output

    Vacuum Tubes: (3) ECC83/12AX7A, (3) 6922/6DJ8
    Power: 120V or 240Vac, 45W
    Power Supplies: +300Vdc, +6.3Vdc,+12.6Vdc, ± 18Vdc, and +12vdc, fully regulated with soft-start warm-up and output muting
    Dimensions: 2U enclosure, 19" x 3.5" x 12.5" (48.2 x 8.8 x 31.8 cm)
    Weight:14lbs (6.4kg)

    Note: Operating level is +4dBu = 0VU = 1.228v
    Unless otherwise stated, all measurements are referenced to +4dBu, 0-80 kHz bandwidth.
    All specifications are subject to change without notice.
    As with all tube circuits, specifications will vary with tube brand, age or differences in internal structure.

    Mic Preamp
    Input Gain:+33 to +63dB in 3dB steps
    Input Impedance:1500 transformer balanced and floating
    Frequency Response:-1.0dB 15Hz and 65kHz with 10K load, +45dB gain, unbalanced or transformer-balanced
    -1.0dB 22Hz and 60kHz with 600 load, +45dB gain, unbalanced or transformer-balanced
    Noise: EIN less than -125dBu with 150 input load (> 83dB below +4dBu)
    Distortion: THD+N less than 0.025%, +45dB gain, unbalanced output;
    less than 0.06% from 200Hz-20kHz (< 0.6% at 20Hz), transformer-balanced output

    DI Preamp
    Input Gain: +20 to +50dB (Instrument), 0 to +20dB (Line) in 3dB steps
    Input Impedance: 10M or 1M (Instrument), 100k with 20dB pad (Line)
    Frequency Response: -1.0dB 10Hz and 85kHz, with 10K load, + 20dB gain, unbalanced or transformer-balanced
    -1.0dB 22Hz and 75kHz, with 600 load, + 20dB gain, unbalanced or transformer-balanced
    Noise: EIN less than -113dBu with input shorted (> 83dB below +4dBu)
    Distortion: THD+N less than 0.015%, 20Hz-20kHz, +20dB gain, unbalanced output;
    less than 0.05% from 200Hz-20kHz (< 0.6% at 20Hz), transformer-balanced output
    Max. Output Level: +32dBu into 10k load, Output control at maximum, unbalanced or transformer-balanced
    +24dBu into 600 load, Output control at maximum, unbalanced or transformer-balanced
    Phantom Power: +48Vdc applied to pins 2 and 3
    Mic Pad: -20dB pad at the primary of the mic input transformer
    Mic Phase: inverts the phase at the secondary of the mic input transformer
    Mic Lo Cut: 12dB/octave rolloff at 75 or 150Hz
    Polarity: input and output XLR connectors are pin 2 hot

    Equalizer
    Circuit Type: modified Baxandall-style feedback equalizer
    Input Sensitivity:+4dBu
    Input Impedance:10k
    Frequency Bands
    Hi: ±10dB shelving at 7, 10, or 15 kHz
    Mid: ±10dB peaking at 0.7, 1.6, 2.2, 3.3, 5.0 and 6.5 kHz, Q=1.0
    Lo: ±10dB shelving at 50, 100, or 200 Hz
    Freq. Response: -1.0dB 16Hz and 45kHz with 10K output load, unbalanced or transformer-balanced
    -1.0dB 20Hz and 45kHz with 600 output load, unbalanced or transformer-balanced
    Noise: > 79dB below +4dBu
    Distortion: THD+N less than 0.015% from 20Hz-20kHz, +20dB gain, unbalanced output;
    less than 0.06% from 200Hz-20kHz (< 0.6% at 20Hz), transformer-balanced output
    Max. Output Level: +32dBu into 10k load, Output control at maximum, unbalanced or transformer-balanced
    +24dBu into 600 load, Output control at maximum, unbalanced or transformer-balanced

    Opto-Compressor
    Circuit Type: optical input attenuator and class A vacuum tube gain stage
    Input Sensitivity: +4dBu
    Input Impedance: 10k
    Freq. Response: -1.0dB 8Hz and 100kHz with 10K output load, unbalanced or transformer-balanced
    -1.0dB 20Hz and 100kHz with 600 output load, unbalanced or transformer-balanced
    Noise: > 76dB below +4dBu , output control at unity gain
    > 76dB below +4dBu , output control at +15dB
    Distortion: THD+N less than 0.016% from 20Hz-20kHz, +20dB gain, unbalanced output;
    less than 0.06% from 200Hz-20kHz (< 0.6% at 20Hz), transformer-balanced output
    Max. Output Level: +32dBu into 10k load, Output control at maximum, unbalanced or transformer-balanced
    +24dBu into 600 load, Output control at maximum, unbalanced or transformer-balanced
    Max. Gain Reduction: > 30dB
    Threshold: off to -20dB
    Ratio: 1.5:1 to 15:1
    Output:-5 to +15dB
    Modes: fast (peak-averaged), average (rms), vintage (program-dependent) or manual operation;
    attack time varaible from 1.0ms to 100ms
    release time varaible from 0.1s to 2s
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    Price *
    $4893.00
    $4231.00
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    Rental
     
    Price/Day
    Total
    1 Day
    $90.00
    $90.00
    3 Days
    $60.00
    $180.00
    5 Days
    $45.00
    $225.00
    12 Days
    $30.00
    $360.00
    28 Days
    $19.25
    $539.00
    Additional information
    For more information about the Quartet, please visit the website of Pendulum Audio
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