Line output
Preferred. Set it low first, then raise only until the normal listening level is clean and CLIP stays clear.
Connection guide
Connect the audio path safely.
QRNix belongs between a controlled radio audio source and your speaker or amplifier. Set the source level once, then leave it stable for reliable noise reduction.
Signal path
Radio audio → QRNix → speaker.
Radio line or headphone out
QRNix line in
QRNix line out
Powered speaker or amplifier
Connection steps
Make the path, then establish the input level.
- Choose a suitable source. Use the radio's line output when available. A headphone output can work if its level is kept controlled.
- Connect source to QRNix line in. Use an appropriate stereo audio cable or adapter for the radio and QRNix jacks.
- Connect QRNix line out to the listening system. Use a powered speaker or amplifier input, not a passive speaker directly.
- Apply USB power. QRNix starts in its normal boot sequence; the OLED then shows the live status screen.
- Start in Bypass with the source level low. Bring the radio audio up until you hear clean, unprocessed audio through the listening system.
- Watch for CLIP. The OLED indicates an overload by inverting the mode line: the top line shows inverted colors while the input is clipping. When you see that, lower the radio source level until the inversion stops. Once CLIP stays clear, keep the source setting fixed before using Spectral capture.
USB data
Optional: connect the USB port to a computer.
The same USB port that powers QRNix carries a serial link. QRNix Manager uses it to watch the live status, check the installed firmware version, and install verified updates — without touching the audio path. The box works fully standalone when no computer is connected.
Why level matters
Set it once, then let the DSP compare like with like.
Spectral mode stores its captured noise profile in absolute digital levels. Changing the input level after capture makes the profile stale, which can lead to over- or under-suppression. The CLIP indicator exists to make the initial level setting checkable without test equipment: the OLED inverts its mode line whenever the input overloads.
Headphone output
Usable with care. Keep the radio volume low at first and use CLIP as the hard limit.
Speaker output
Requires a proper attenuating interface before QRNix. Do not connect it directly to the current line input.
If audio is wrong
Three quick checks.
No audio reaches the speaker
Return to Bypass, check that QRNix is powered, confirm the radio is feeding line in, and verify that the listening system is connected to QRNix line out and powered.
The audio is distorted or the OLED shows the CLIP inversion
Lower the radio source level until the mode line stops inverting. A speaker-level output must not feed the current QRNix line input directly.
Spectral mode changes little
Capture again during a representative noise-only moment. If the band changed after capture, the old profile is no longer representative.