AV Tools / Audio & Power

Microphone Feedback Calculator

Calculate microphone feedback distance and check whether the system has enough gain before feedback.

Projects
Pro
Distances

Closer = better gain

Further = better gain

The gap to fill with amplification

Farthest listener from speaker

Results

PAG

12.4

dB

NAG

1.9

dB

Margin

10.5

dB

SAFE

System has sufficient margin before feedback.

What is PAG/NAG?

PAG (Potential Acoustic Gain) predicts the maximum amplification a sound system can achieve before feedback occurs. NAG (Needed Acoustic Gain) is the amount of amplification actually required to reach the farthest listener.

If PAG exceeds NAG by at least 6 dB, the system has a safe operating margin. If not, the system will likely produce feedback before reaching adequate volume.

Formulas

PAG = 20log(D0) - 20log(D1) + 20log(Ds) - 20log(D2) - 10log(NOM) - 6dB

NAG = 20log(Ds) - 20log(D2)

Margin = PAG - NAG (need ≥ 6dB)

Setup Diagram
TalkerMicrophoneSpeakerListenerD1 = 0.6D0 = 4D2 = 8Ds = 10D1 = Talker→Mic | D0 = Speaker→Mic | D2 = Speaker→Listener | Ds = Talker→Listener

Disclaimer

These tools are provided in beta and are subject to change. All calculations and results may contain errors and should be independently verified by a qualified professional before use in any design, installation, or safety-critical application. AV500 accepts no liability for decisions made based on these outputs.