SPL Iron Mastering Compressor - Black (B-Stock)

Get the sonic virtues of legendary vintage tube compressors with the advantages of the High Dynamic 120 V operating voltage in a single unit
SPL Iron Mastering Compressor - Black (B-Stock)


$5,199.00 (You Save 20%)

or $217/month for 24 months 0% interest for 24 months*. 24 equal monthly payments required. Learn more
In Stock
Item is in stock and will ship the next business day. Place your order before 4:30pm ET Mon-Fri and we will ship your items the same day.

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What is a B-Stock Item?

B-Stock items are those that have been indicated as having a minor cosmetic flaw by the manufacturer and as such are being sold at a reduced price. These items often have small cosmetic blems in metal work, paint, or fabric that do not affect the functionality of the unit whatsoever. B-Stock items come with all original factory packaging and accessories as well as the full manufacturer’s warranty. You will also receive Vintage King’s 1-year of additional warranty coverage free of charge with any B-Stock item purchase, so rest assured that not only are you saving big by purchasing a Demo Deal, but Vintage King offers the same level of world-class support as with the purchase of a factory sealed unit.


The SPL Iron Mastering Compressor is not a copy of a classic unit, but rather an original concept in itself. Our goal was to conceive a compressor that provided a pleasant, melodic-sounding, transparent compression, inspired on the vintage compressors of the radio era. And we wanted it to be versatile enough to adapt perfectly to the needs of modern mastering studios.

Thus, the Iron combines not only the sonic virtues of legendary vintage tube compressors with the advantages of the High Dynamic 120 V operating voltage in a single unit. It also sets a new benchmark in terms of tube compressor technology, with the innovative implementation of a parallel dual-tube circuit.



  • Variable bias tube compressor
  • Parallel dual tube circuit
  • Tube selection and pairing with Weigl Roe Test
  • Specially conceived Mu-Metal iron transformers
  • Feed-forward resistive vactrol-opto-isolator
  • Six different Rectifier settings available
  • Sidechain that allows you to choose between Off, four sidechain-filter presets or an external sidechain signal.
  • All functions can be adjusted via switches or, in the case of the Threshold, with a detented potentiometer
  • In Link mode, the Threshold, Tube Bias, Attack, Release, and Rectifier parameters, as well as the Sidechain EQs, are controlled with the right side (channel 2) of the unit.
  • Additional passive 120 V equalizer with two presets
  • High Dynamic 120 V operating voltage
  • Auto Bypass mode
  • Made in Germany



  • Frequency Range: 10 Hz - 40 kHz
  • CMRR (@ 0dBu): 1 kHz: >80 dB / 10 kHz: › 65 dB
  • THD & N (@ 0 dBu): >82 dB
  • Noise (A-weighted): -98 dBu
  • Total Harmonic Distortion:
    • 0.06 % @ 1 kHz/-10 dBu
    • 0.01 % @ 1 kHz/0 dBu
    • 0.002% @ 1 kHz/+10 dBu
  • Input Impedance 20 kOhm
  • Max. Input Level: + 32.5 dBu
  • Output Impedance: ‹ 50 Ohm
  • Max. Output Level: + 32.5 dBu
  • Power Consumption: max 45 W
  • Fuses:
    • 230 V/50 Hz: 1 Amp
    • 115 V/60 Hz: 2 Amp
  • Dimensions: 482 x 177 x 311.5 mm; 19“ x 7“ x 12.25“
  • Weight: 11 kg / 24.25 lb

Additional Information

Condition New

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