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Iron Mastering Compressor

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Item: D15-1322

Availability: In stock

Iron Mastering Compressor
Iron Mastering Compressor Iron Mastering Compressor


The SPL ‘IRON’ (Model 1520) is a Mastering Compressor featuring tube architecture and a Vari-Mu-operational principle, built on SPL’s time tested 120 Volt Rail technology. The SPL IRON features 6 rectifier settings for the detector circuit as well as 4 distinct filters present in the side-chain signal path. Low, Mid, and High Tube Bias settings are available for each channel.

IRON is a powerful and complex compressor capable of any and all audio compression duties. 


  • 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 tibre-shaping
  • Tape Roll-Off tibre-shaping
  • Rotary Switch Controls for Attack, Release, Ration, Input and Output
  • Audition Function – adjustable time-interval Engage/Bypass – accurate perspective
  • Designed by Wolfgang Neumann

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