Tech Tools / Gain Staging
Gain Staging & Levels
Convert dBu, dBV, Vrms, and dBFS. Set +24 / +18 / +4 / −10 references. Mic vs line headroom. Watts ↔ volts into ohms. Amp power + sensitivity → SPL at distance.
Use at your own risk. Converter math is exact for the formulas shown; real devices clip, pad, and meter differently. Speaker sensitivity and amp ratings are manufacturer claims — verify on the nameplate and with measurement. This tool is a planning aid only. Always verify against manufacturer documentation and on-site measurements before deploying to a show.
- dBu
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- dBV
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- Vrms
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- dBFS
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- Headroom to 0 dBFS
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- Peak V
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- Level class
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- Ref 0 dBFS
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Amp → SPL
- SPL @1 m
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- SPL @ distance
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- Volts into load
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- Watts
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Sources
- dBu: 20·log₁₀(V / 0.775) · dBV: 20·log₁₀(V / 1.0).
- dBFS mapping: dBFS = dBu − ref_dBu (where ref_dBu is the analog level defined as 0 dBFS).
- Power: P = V²/R · V = √(P·R).
- SPL: SPL = sensitivity + 10·log₁₀(P_watts) − 20·log₁₀(d_meters) (1 W / 1 m reference, point source).
What this gain staging tool does
It converts between common audio level units and estimates loudspeaker SPL from amplifier power and sensitivity.
Key relations
dBu = 20 log₁₀(V/0.775); dBV = 20 log₁₀(V/1); P = V²/R.
Worked example
+4 dBu into a +24 dBu = 0 dBFS converter → −20 dBFS. A 100 W amp into a 97 dB/1W/1m speaker → ~117 dB SPL at 1 m (before real-world limits).
FAQ
What is 0 dBu?
0 dBu = 0.775 Vrms. +4 dBu ≈ 1.228 Vrms (pro line). 0 dBV = 1.0 Vrms; −10 dBV is common consumer line.
How do you map dBu to dBFS?
dBFS = dBu − ref_dBu, where ref_dBu is the analog level defined as 0 dBFS (e.g. +24 or +18).
How do watts and sensitivity become SPL?
SPL ≈ sensitivity_dB@1W/1m + 10 log₁₀(P) − 20 log₁₀(d_meters).
Gain staging a show?
Kynetic engineers broadcast and live mixes for Fortune 500 and medical events.