SPL Passive Equalizer

SPL Passive Equalizer

SPL Passive Equalizer

No Longer Available

Product Highlights

  • 144 Total Passive Filters
  • Individual Single-Core Coils Per Filter
  • 120V Makeup Amplifiers with 150 dB DNR
  • Amplifiers Have 200v/ms Slew Rate
  • Custom-Made Coils For Critical Mids
  • Boost and Cut Crossovers
  • Matched Lundahl Transformers
  • Switchcraft XLR Contacts
  • Elma & ALPS Switches and Potentiometers
  • Linear PSU with Toroidal Transformer
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SPL SPLPASS overview

  • 1Description

The SPL Passive Equalizer is a classic design comprised of passive coil filters for audio processing in recording, mixing, mastering, and Hi-Fi playback applications. The device features a total of 144 passive filters (72 per channel, 36 boost and 36 cut)) with individual single-core wound coils per filter, with each filter optimized for the frequency assigned.

This design excludes sonic degradation from mutual influences while also improving total harmonic-distortion values. The coils for the critical mid-frequency ranges are custom made, and boost and cut crossovers are designed to mesh perfectly so that the high number of frequencies one can dependably command is the most elaborate set of response curves to date. Each channel is divided into three cut and three boost bands, each offering 12 switchable frequency ranges. Makeup gain is provided by 120V makeup amplifiers based upon the company's SUPRA-OPs with a dynamic range of 150 dB and a slew rate of 200v/ms.

The Lundahl transformers are matched to the sonic characteristics of the EQ to provide balanced I/O stages. The XLR contacts are provided by Switchcraft, and the switches and potentiometers are from Elma and ALPS (including the ALPS "Big Blue" potentiometer with 41 distinct steps.) Power is supplied to the EQ via an internal linear power supply featuring a generously proportioned toroidal transformer and voltage selection (110 to 120V, 60 Hz or 220 to 240V, 50 Hz.)

In the Box
SPL Passive Equalizer
  • Limited 2-Year Warranty
  • Table of Contents
    • 1Description

    SPL SPLPASS specs

    I/O 2x XLR-3F inputs (left and right)
    2x XLR-3M outputs (left and right)
    Filters 144 passive filters
    72 passive per channel
    36 boost
    36 cut
    Frequency Range Selection 12
    Amplifiers 120 V
    Dynamic Range 150 dB
    Slew Rate 200 v/ms
    Power Supply 110 to 120 V, 60 Hz or 220 to 240 V, 50 Hz
    Dimensions Not specified by the manufacturer
    Weight Not specified by the manufacturer

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