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.

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AHB2 Output Calculator

by John Siau November 23, 2022 1 min read

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.

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Benchmark System Calculator

by John Siau November 23, 2022 1 min read

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
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Benchmark HPA4 Calculator

by John Siau November 16, 2022 1 min read

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)
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Speaker Sensitivity Converter

by John Siau November 16, 2022 1 min read

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.

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Headphone Sensitivity Converter

by John Siau November 16, 2022 1 min read

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
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THD+N Audibility Calculator

by John Siau November 16, 2022 4 min read

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.

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Uncorrelated Noise Summation

by John Siau November 15, 2022 3 min read

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.

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