Audio Calculators

Peak SPL Calculator

by John Siau November 23, 2022 3 min read

PEAK SPL CALCULATOR
Speaker Sensitivity:	dB SPL (2.83 V, 1 M)
Amplifier Power Per Channel into 8 Ohms:	Watts

RESULTS
Peak Output Level (at typical listening position):	dB SPL

Click "Read More" for a tutorial and an advanced calculator that includes adjustments for the number of speakers, the listening distance, and the room configuration.

AHB2 Output Calculator

by John Siau November 23, 2022 1 min read

AHB2 Calculators dBu dBW SPL Vrms Watts

AHB2 OUTPUT CALCULATOR
Input Level:
	dBu
	Vrms
Sensitivity Setting:	+22 dBu (Gain = 9.25 dB)
	4 Vrms (Gain = 17 dB)
	2 Vrms (Gain = 23 dB)
Amplifier Mode:	Stereo
	Bridged Mono
Speaker ohms:	4 Ohms
	8 Ohms

RESULTS
Output Voltage:	Vrms
Output Level:	dBu
Relative Output Level:	dB relative to 2.83V
Output Power:	dBW
Output Power:	Watts
Amplifier Headroom:	dB

Click "Read More" for an advanced calculator which calculates SPL at the listening position when using an AHB2 power amplifier.

Benchmark System Calculator

by John Siau November 23, 2022 1 min read

AHB2 Calculators DAC3 HPA4 LA4 SNR SPL

Calculate the combined system performance of a Benchmark audio system using a DAC3 D/A converter, LA4 line amplifier, and AHB2 power amplifier.

BENCHMARK SYSTEM CALCULATOR
DAC Calibration:	+24 dBu at 0 dBFS, XLR Input (Benchmark DAC)
	4 Vrms at 0 dBFS, XLR Input (Typical HiFi Balanced)
	2 Vrms at 0 dBFS, RCA Input (Typical HiFi Unbalanced)
LA4 Volume Setting:	dB
AHB2 Amplifier Mode:	Stereo
	Bridged Mono
Speaker Sensitivity:
	dB SPL (2.83 V, 1 meter)
	dB SPL (1 Watt, 1 meter)
Speaker ohms:	4 Ohms
	8 Ohms
Distance from Speaker(s):	meters
Number of Speakers:	One Speaker
	Two Speakers
Room Configuration:	Anechoic Chamber or Large Open Space
	Typical Listening Room
	Speakers Mounted on or in Front Wall

CONTRIBUTING FACTORS
Amplifier Output Level:	dB (relative to 2.83 V)
SPL from single loudspeaker:	dB SPL (2.83 V, 1 meter)
Gain from multiple loudspeakers:	dB
Loss due to distance:	dB (relative to 1 meter)
Gain from room reflections:	db (typical - may vary)
RESULTS
Peak Output Level (at typical listening position):	dB SPL
Amplifier Headroom (at Peak Output):	dB
Amplifier Peak Output Power:	Watts

Benchmark HPA4 Calculator

by John Siau November 16, 2022 1 min read

Calculators dBm dBV Headphone Amplifier HPA4 SPL

BENCHMARK HPA4 CALCULATOR
DAC Calibration:	+24 dBu at 0 dBFS, XLR Input (Benchmark DAC)
	4 Vrms at 0 dBFS, XLR Input (Typical HiFi Balanced)
	2 Vrms at 0 dBFS, RCA Input (Typical HiFi Unbalanced)
HPA4 Volume Setting:	dB
Headphone Sensitivity:
	dB SPL @ 1 mW
	dB SPL @ 1 Vrms
Headphone Impedance:

RESULTS
Amplifier Output Power:	mW (at peak SPL)
Relative Output Power:	dBm (dB relative to 1 mW)
Relative Output Level:	dBV (dB relative to 1 Vrms)
Headphone Peak SPL:	dB SPL
Amplifier Headroom:	dB (at peak SPL)

Speaker Sensitivity Converter

by John Siau November 16, 2022 1 min read

Calculators Sensitivity SPL

Speaker Sensitivity Converter
Speaker Sensitivity:
	dB SPL (1 W, 1 M)
	dB SPL (2.83 V, 1 M)
Speaker Impedance:	Ohms

RESULTS
Power Sensitivity:	dB SPL (1 W, 1 M)
Voltage Sensitivity:	dB SPL (2.83 V, 1 M)

Click "Read More" for a tutorial.

Headphone Sensitivity Converter

by John Siau November 16, 2022 1 min read

Calculators Headphone Amplifier Sensitivity SPL

Headphone Sensitivity Converter
Headphone Sensitivity:
	dB SPL @ 1 mW
	dB SPL @ 1 Vrms
Headphone Impedance:	Ohms

RESULTS
Power Sensitivity:	dB SPL @ 1 mW
Voltage Sensitivity:	dB SPL @ 1 Vrms

THD+N Audibility Calculator

by John Siau November 16, 2022 4 min read

Calculators Noise Sensitivity SPL THD

THD+N AUDIBILITY CALCULATOR
THD+N:	dB
Speaker Sensitivity:	dB SPL (2.83 V, 1 M)
Amplifier Power Per Channel into 8 Ohms:	Watts
Distance from Speaker(s):	meters
Number of Speakers:	One Speaker
	Two Speakers
Room Configuration:	Anechoic Chamber or Large Open Space
	Typical Listening Room
	Speakers mounted on or in front wall

RESULTS
Peak Music Level:	dB SPL (at listening position)
Peak THD+N Level:	dB SPL (at listening position)
AUDIBILITY
THD+N is absolutely inaudible if THD+N SPL level is negative.
THD+N may be audible if THD+N SPL level is positive.

Click "Read More" for a tutorial and a more advanced version of this calclulator.

Uncorrelated Noise Summation

by John Siau November 15, 2022 3 min read

Calculators dB Noise SNR SPL

Noise Summation
Noise Level 1:	dB
Noise Level 2:	dB

RESULTS
Noise Sum:	dB
Units may be dBFS, dBSPL, dBV,
dBu, dBm, dBW,
or dB relative to full output.
(All units must match)
Uncorrelated Noise Only

Noise Voltage Summation
Noise Voltage 1:
Noise Voltage 2:

RESULTS
Noise Voltage Out:
Units may be V, mV or uV
(All units must match)
Uncorrelated Noise Only

Click "Read More" for a tutorial with interactive examples.

Recent Articles