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SPL 9738 User Manual

Dual channel parametric tube/lc equalizer
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Manual
Model 9738
Dual Channel Parametric Tube/LC Equalizer

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Summary of Contents for SPL 9738

  • Page 1 Manual Model 9738 Dual Channel Parametric Tube/LC Equalizer...
  • Page 2 Changes without notice. This document is the property of SPL and may not be copied or reproduced in any manner, in part or full without the authorisation of SPL.

  • Page 3: Table Of Contents

    Specifications..................22 Warranty....................23 Foreword Dear customer, Thank you for the confidence you have shown towards SPL electronics GmbH by purchasing the SPL Q .You have decided to use a tool of high performance which sets you in the position to have faster success and a better sound quality in your music productions and pre-masterings.

  • Page 4: Introduction

    The QURE circuitry The QURE circuitry improves The QURE circuitry is a new SPL development which gives the name for the unit and also represents a new technology, which presence, clarity and depth.
  • Page 5 Proportional Q With the musical Unlike most other equalizers which use constant-Q filters, the proportional-Q principle the adopts the proportional-Q principle to realize maximum musicality. Conventional constant-Q designs keep the amplitude amplitude of the processed constant, regardless of the adjusted bandwidth (Q).The disadvan- frequency band is reduced tage of this is, when it comes to sound creation, frequencies as the bandwidth broadens.

  • Page 6: General Features

    • Hard-bypass for each filter band and both cut filters • Master relay hard-bypass for entire unit • Central Grounded Shield Layout • SPL super-balancing hybrids (CCMR -90 dB) • Tube warm up circuitry for prolonged tube-life • Overrated internal toroidal power supply •...

  • Page 7: Operation Safety

    Operation Safety The housing of the Q has the standard 19"-EIA format and occupies 2U (88.9 mm) in your rack. When installing the unit in a 19"-rack, the rear side of the unit needs some support, especially in a touring case. Choose the installation location of your unit carefully: The Q should not be installed near units which produce...

  • Page 8: Connections

    Q is not intended to be used as a mixer! To ensure optimal signal quality, SPL has developed a super- balancing hybrid input/output stage using all laser-trimmed resi- stors with a tolerance of 0.01%.This approach has resulted in high CCMR (common mode rejection) values better than -90 dB at 1 kHz.

  • Page 9: Applications

    Applications 1. Processing single instruments or vocals To process single instruments or vocals insert the two separate channels into the specific inserts of your console to process two signals independently. Note that the MASTER switch will bypass both channels together. Use the bypass switch of each filter band when proces- sing two independent sources.

  • Page 10: Control Elements

    Control Elements WARM UP & The Q features a special relay circuitry that slowly builds up the 275 volts over a period of 45 sec. Thereby the lifetime of the READY tubes is increased by up to four times. In pre-mastering this circuitry garantees a reproducable sound for a long time.

  • Page 11: Hf/Lf Cut On

    The Q features an IN control that enables you to set the level at which the Q filters operate. The level can be changed between -12 dB and +18 dB. To run the unit hotter set the level between the 0 dB-position and the clockwise position (up to +18 dB).This will result in a more intensely processed sound.
  • Page 12 Diagram 3: Frequency responses for the lowest (40Hz) and highest roll-off (200Hz). HF CUT: 20kHz to2.5kHz LF CUT: 40Hz to 200Hz LF (Low Freq.) The low frequency control (LF) operates over more than four octaves. The center frequency can be varied between 15 Hz and 365 Hz.
  • Page 13 MF (Mid Freq.) The mid frequency control (MF) also covers more than four octaves. The center frequency can be varied between 200 Hz and 5 kHz. Diagram 5: Frequency responses for the lowest (200Hz) and highest (5kHz) MF control value at max.
  • Page 14 BW (Bandwidth) The bandwidth (BW) control is identical for all three frequency bands. The BW control determines the width (or the Q) the frequency curve around the selected center frequency is to have. The parameter is measured as a quotient Q of the following formula: Q = (f o f u )/ (f o -f u ) f o is the upper corner frequency and f u the lower corner...

  • Page 15: B/C

    Using low-Q values, automatically readjusts the amount of boost Proportional-Q automatically or cut selected to keep the subjectively perceived loudness readjusts the amount of constant. With constant-Q equalizers there is often only a limited boost or cut to keep the range of useable settings.
  • Page 16 Diagram 10: Frequency responses for max. BOOST/CUT and low Q adjustments (+/- 15dB, Q0.5) for the LF and HF bands The BOOST/CUT control of the MF band realizes maximum boost of 15 dB and maximum cut of -36 dB. This response is called ‘non-reciprocal response’...

  • Page 17: Lf/Mf/Hf On

    Diagram 12: Non-reciprocal responses of the MF band (+/-15dB, Q0.5) Once found, the B/C control can be backed off to provide the desired degree of cut or boost and the Q setting adjusted by ear. Initially, it helps to bypass the other equalizer sections so that you can work on each equalizer independently.

  • Page 18: Qure

    Integrating a coil/condenser/ The QURE ON switch puts a coil/condenser/resistor filternet- resistor filternetwork (LCR) work (LCR) into the tube output stage. This network is integrated into the signal path into the coupling path of the tubes and reacts on the dynamic reponse of the input signal changing THD spectra and phase responses.
  • Page 19 Diagram 13: The diagram shows a frequency sweep from 1kHz to 4 kHz with the correspon- ding harmonical structure over a period of about 30 seconds. The frequency response is linear. The MF band is active with B/C set to zero. Diagram 14: By activating the QURE- circuitry the harmonical...

  • Page 20: Shift Qure

    SHIFT QURE The SHIFT QURE switch changes the controllable frequency range of the QURE control from 2 kHz-6kHz (SHIFT QURE not active) to 400 Hz-2 kHz when the SHIFT QURE is active and the status-LED illuminates. The signal runs through a tube circuitry featuring a Sovtek 12 AX 7 double triode tube in a mixed current/voltage coupling mode.The output stage is extremely clip-resistant and produces a pleasant and musical sounding tube-THD spectrum.

  • Page 21: Power Supply

    Power Supply Special care has gone into the design of the power supply of the . The power supply is the heart of an electronic system: The better it is, the better the whole system works and – in an audio system –...

  • Page 22: Specifications

    Specifications Input & Output Instrumentation amplifier, electronically balanced (differential) transformerless Nominal input level ......... 6 dB Input impedance ..........= 22 kOhms Output impedance .......... < 600 Ohms Max. input level ..........+14 dBu Max. output level ..........+20 dBu Minimum load ohms ........

  • Page 23: Warranty

    The specific period of this limited warranty shall be that which is described to the original retail purchaser by the authorized SPL dealer or distributor at the time of purchase. SPL does not, however, warrant its products against any and all...
  • Page 24 Bedienungsanleitung Manual...

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Qure 9738

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