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SPL Iron Mastering Compressor

SPL Iron Mastering Compressor

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SPL Iron Mastering Compressor

The SPL Iron Mastering Compressor is a high-quality Vari-Mu compressor designed for mastering application.


The SPL Iron uses features no less than 6 valves for the rectifier stage which can be selected for different tonality, as well as another two on the input and output stages. Custom Lundahl transformers are also included on the input and output stage. The Iron uses SPL’s superb 120V technology which has been employed on the Neos ensuring extremely high headroom and low distortion for superb sonic performance.


A selection of four Sidechain EQ filters is included as well to modify the behaviour of the compressor which is also augmented by AirBass and TapeRollOff switches. Being a Vari-Mu design, the ratio is dependent on the gain reduction and therefore there are no ratio controls. Simply control the attack, release of threshold to control the level of compression while the rectifier and Side Chain EQ will change the colouration and behaviour of the compressor.


SPL Iron Mastering Compressor Main Features:



  • Mastering-grade Vari-Mu compressor

  • 6 Rectifier valves

  • Two input and output ECC83 Valves

  • Custom Lundahl input and output transformers

  • 120V Rail technology

  • 4 Side chain EQ filters per side

  • AirBass and TapeRoll Off Switches

Short Description Vari-Mu Valve Mastering Compressor with 120V rail technology, Feedforward design and comprehensive side chain filters
Demo in Store N/A
Manufacturer SPL
Old Price N/A
Dynamics Type Compressor
Valve / Solid State Valve
Channel Count Dual Channel
Chassis Rackmount
Compression Type Vari_Mu
Attack No
Release No
Ratio N/A
Threshold No
Digital I/O No
High Pass Filter No
Side Chain Input No

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