01
Reduction
0 to 30 dB
Sets how much residual noise remains after processing.
Hear the signal, not the static.
QRNix is a standalone DSP box between your radio and speaker. Pick a mode, tune four controls, and keep the radio in the conversation.
What it does
Noise reduction that stays out of your way.
QRNix listens to the audio leaving your receiver, estimates the noise, and reduces it before the audio reaches your speaker or amplifier. Bypass remains one switch movement away for an honest A/B comparison.
Front panel
Four knobs, one clear job each.
Start low, listen, then add only what the band needs.
02
Smoothing
0 to 100%
Steadies a moving noise floor. Too much can blur fast speech.
03
Whitening
0 to 100%
Softens tonal residue so aggressive reduction sounds more natural.
04
Aggression
0.00 to 2.00
Sets how hard QRNix suppresses noise. Start low to protect voice quality.
One button. Tap to cycle Tone-kill and Post-filter. Hold it in Spectral mode to capture a noise profile and auto-tune the controls.
Mode switch
Choose the noise strategy, then get on with listening.
Every mode includes its best use, so there is no separate decision chart to decode.
Center
Bypass
Unprocessed audio through the box.
Best when: comparing settings, checking the band, or leaving the audio untouched.
Manual profile
Spectral
Hold the button during a one-second noise-only moment. QRNix uses that captured profile — and tunes the four controls to it — until you recapture or power off.
Best when: the noise is stable and weak signals need protection.
Continuous estimate
Adaptive
QRNix keeps updating its noise estimate as the band changes.
Best when: tuning around or following a shifting noise floor. Enter during quiet audio when possible.
Auto-tune
One hold. Four controls tuned to the noise.
QRNix can set its own controls. Capture one second of noise and let the box find the Reduction, Smoothing, Whitening, and Aggression that fit it.
Capture
Hold the button in Spectral mode during a noise-only moment. QRNix records one second of the noise floor.
Tune
The box sweeps candidate settings and locks the best match — press again to cancel. The OLED shows Tuned.
Take over
Every knob stays tunable: move one to its tuned position and QRNix hands that control back to you.
Signal helpers
Four useful features.
Two are button-controlled. Two watch the signal for you.
Tone-kill
Suppresses a sustained tuning tone in any mode.
Post-filter
Smooths musical residue in Spectral and Adaptive modes.
CLIP
Flags an overloaded input so the source level can be reduced.
Auto input
Monitors both input channels and selects the stronger sustained signal.
Go deeper
Details live where you need them.
The overview stays short. Setup, operating details, and engineering facts have their own pages.
User guideOperate QRNixFirst session, modes, controls, and button behavior.
Connection guideWire your radio safelySource level, signal path, CLIP, and speaker-output limits.
Technical specificationsSee the hardwareDSP path, board, controls, display, and current limits.
FAQGet quick answersCapture, artifacts, modes, input level, and expected behavior.
Companion app
Meet QRNix Manager.
A free terminal app that connects over USB: live signal trends, firmware version checks, and verified firmware updates.
Get in touch
Questions about QRNix?
Setup, firmware, or the project in general — email lands in the QRNix inbox with the subject prefilled.