FMR Audio RNC500 Really Nice Compressor - 500 Series (Discontinued)


93 out of 100. Incorporating 10+ ratings and reviews.

Street Price: 

FMR Audio RNC500 Really Nice Compressor

Gearank High Notes

Gearank Recommendation

The RNC500 appeared on our recommended list for 500 Series Compressors when we first published it in May 2017 where it remained until September 2022 when it was removed due to a lack of availability.

Rating Source Highlights

Website Source *Rating Value
Sound On Sound Bob Thomas 98/100
Bonedo (German) Hannes Bieger 80/100
*Displayed values are prior to the Gearank Algorithm's adjustments it makes when evaluating the source.


The RNC500 is the 500 series version of FMR Audio's well-renowned RNC rackmount compressor. It is a simple and affordable compressor that delivers an improved dynamic fidelity over the original RNC.

It features over-current protection, which protects the whole 500 series rack from external damage, and an early warning power-supply detection that puts the module in bypass mode while switched on to avoid powered down “pops”.

Its highlight features include its Normal and SuperNice mode, which gives you flexible compression options. The Normal mode acts as a regular hard-knee compressor, while the SuperNice mode provides a 3-band transparent sounding compression.


  • Controls: Threshold, Ratio, Attack, Release, Gain
  • Input/Output Impedance: Not specified by manufacturer
  • Maximum Input Levels/Output Levels: +28dBu.
  • Attack: 0.2 to 200 ms
  • Release: 05 to 5 sec
  • Ratio: 1:1, 2:1, 6:1, 10:1, 25:1
  • Threshold: -40dB to +20dB
Unfortunately this is no longer available in stores, however you can see excellent alternatives in our guide to The Best 500 Series Compressors.