SPL Sound Performance Lab SPLIRON
Mastering Compressor, Model 1520


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List Price: $5,499.00
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The SPL IRON ("Model 1520") is a Mastering Compressor designed by SPL designer Wolfgang Neumann, featuring a tube architecture and Vari-Mu-operational principle, built atop SPL's now-famous 120 Volt Rail technology found in their best offerings. Six rectifier settings for the detector circuit are available, as well as four distinct filters present in the side-chain signal path. Tube Bias settings (Low, Mid, High) are available per each channel. As if these features aren't enough, they are joined by "AirBass" and "Tape roll-off" as additional timbre-shaping tools. The controls for Attack, Release, Ratio, Input and Output are designed as a rotary switch, as it is typical for effect units to be used in mastering.

One unique feature to IRON is the "Audition" function which allows you, once engaged, to set a time interval at which IRON will engage the bypass relays so you can have a truly objective perspective on how IRON is compressing and coloring the audio. No more moving around to patch in and pull the patch cables - or doing anything other than simply listening. Well done, Wolfgang.

IRON is a wonderful and complex sounding compressor which can provide a multitude of approaches to applying finishing touches individual tracks, subgroups, or full mixes to cement the work. And as the name should imply, there is quite a bit of heft and weight that IRON can apply to your sound.

SPL IRON Mastering Compressor Features:

  • Valve/Tube Design
  • Vari-Mu Operation Principle
  • 120 Volt Rail technology - Maximum Headroom
  • Switchable Detector Circuit Rectifier Types/Values:
    • Germanium (1mF, 2mF)
    • LED (3.3 mF)
    • Silicon (330 nF)
    • Germanium (220 nF)
    • Germanium /Silicon (100 nF)
    • VU Meter Control (GR, VU, VU+10)
    • Tube Bias (Low, Mid, High)
  • "AirBass" and "Tape roll-off" timbre-shaping
  • "Audition" feature - adjustable time-interval Engage/Bypass - accurateperspective

SPL IRON Mastering Compressor Specifications:

  • Frequency Range (40 kHz = -3 dB): 10 Hz - 40 kHz
  • CMRR:
    • 1 kHz:  80 dB
    • 10 kHz: 65 dB
  • Noise (A-weighted): 98 dBu
  • Total Harmonic Distortion:
    • 10 dBu: 0.3% at 100 Hz; 0.06% at 1 kHz; 0.02% at 15 kHz
    • 0 dBu: 0.01%
    • +10 dBu: 0.002%
  • Inputs:
    • Input Impedance: 20 kOhm
    • Max. Input Level: +32,5 dBu
  • Outputs:
    • Output Impedance: <50 Ohm
    • Max. Output Level: +32,5 dBu
  • Power Consumption:
    • 0.24 Amp, 230V/50Hz, 44 Watt, 55 VA
    • 0.46 Amp, 115V/60Hz, 42 Watt, 52 VA
  • Fuses:
    • 230V/50Hz: 1 Amp
    • 115V/60 Hz: 2 Amp
  • Dimensions:
    • Standard EIA 19-inch Housing/4U: 482 x 177 x 311.5 mm / ca. 19" x 7" x 12.25"
    • Weight: 11 kg / 24.25 lbs.
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