Set DeepFilterNet3 Attenuation Limit for Strong or Weak Signals

DfnrAttenLimit controls how aggressively DeepFilterNet3 suppresses noise. Lowering it preserves more of the original signal on strong signals; raising it maximizes noise removal on weak or noisy signals.

Before you start

• AetherSDR must be running. A radio connection is not required to adjust DSP settings.
• DeepFilterNet3 (DFNR) must be selected as your active noise reduction engine.

Steps

1. Click Settings > AetherDSP Settings....
2. Click the DFNR tab.
3. Drag the Attenuation Limit slider to the desired value (0–100 dB).
4. Close the dialog. The setting takes effect immediately.

What each control does

Control	Default	Valid range	Setting key	Behavior
Attenuation Limit	100	0–100 dB	DfnrAttenLimit	Sets the maximum noise attenuation applied by DeepFilterNet3. At 0 the engine passes audio through unmodified; at 100 it applies full attenuation.
Post-Filter Beta	0.00	0.00–0.30	DfnrPostFilterBeta	Applies an additional post-filter on top of the attenuation limit for extra suppression.

Tips

• For strong, clean signals where preserving fidelity matters, reduce Attenuation Limit toward 0 to limit how much the engine can alter the audio.
• For weak or heavily noise-degraded signals, set Attenuation Limit to 100 and combine with a non-zero Post-Filter Beta for the most aggressive suppression.

Troubleshooting

• Audio sounds unaffected after moving the slider — Confirm you are on the DFNR tab and that DeepFilterNet3 is the active noise reduction engine. Other engines (NR2, NR4, MNR) have separate controls and are not affected by DfnrAttenLimit.

Related

• Configure DFNR post-filter beta for extra suppression
• Choosing the right noise reduction: NR2, NR4, DFNR, MNR
• AetherDSP Settings overview