| Conversion: Sound level SPL, pressure, pascal, and intensity level (SIL) |
Cable length, cable capacity, and the cutoff frequency |
| Table of sound pressure levels − Sound pressure and intensity |
Wave Graphs Calculations |
| Calculate sound pressure, particle velocity, impedance, sound intensity |
Capacitive reactance calculator XC |
| Conversion of level dBu and dBV to volt and vice versa |
XLC reactance calculator |
| Microphone sensitivity conversion dB re 1 V/Pa − transfer factor mV/Pa
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Calculations of L pads for loudspeakers |
| ● Conversion of Factor, Ratio, Gain to a Level Value (Gain Decibels dB) |
Resistor color code calculator |
| The decibel calculator (dB) − A valuable tool |
Why does proximity effect occur? |
| Thermal noise calculation − Johnson noise |
Relationship of acoustic sizes − plane progressive sound wave |
| Time constant and cut-off frequency |
Tuning keyboard frequencies and notes English and German |
| Adding decibels − combining up to ten (10) acoustic levels |
Absorption coefficients of building materials |
| Adding decibels − combining up to thirty (30) sound levels |
The speed of sound, the temperature, and not the air pressure |
| Conversion: Sones to phons and the loudness problem with dBA |
Calculation: Speed of sound in air and the temperature |
| Calculation of the center frequency − Geometric mean |
Frequencies of instruments and voices |
| Levels and references of sound sizes − Calculations |
Calculation RC filter cutoff frequency and time constant |
| Calculation: Electrical voltage, current, resistance, and power |
Temperature dependence of physical entities |
| Decibel (dB) calculation of gain and loss − amplification and damping |
Conversion: Data transfer rate units |
| Calculation: Reverb time RT60 after Sabine |
Chord name finder by note name entry − Chord recognition |
| Calculation: Speed of sound (velocity of sound) in humid air |
Calculation of the direction of phantom sources by Δ L and Δ t |
| Conversion: Time difference and sound path distance |
Calculation: Voltage and power − gain and loss |
| Calculation: Period, cycle duration, periodic time to frequency |
Tony Faulkner's parallel AB figure-of-eight microphone pair |
| Conversion of Bandwidth in octaves to Q factor and vice versa |
Tony Faulkner's Phased Array microphone system − review |
| Q Factor and center frequency − Find the −3 dB cutoff frequencies |
Phantom image sources − Stereo loudspeaker signals 1 |
| Calculation: Wavelength in air and the temperature |
Phantom image sources − Stereo loudspeaker signals 2 |
| Calculate dB as voltage sum and phase, and power sum |
Interval conversion: Frequency ratio to cents |
| Calculation of room modes: axial, tangential, and oblique |
Measurement Unit Conversions − Unit conversion calculator |
| ● Total level in decibels − Adding of non-coherent sound sources |
Conversion: ALcons and STI (speech intelligibility) |
| ● Total level in decibels − Adding of coherent electrical signals |
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| Conversion of bits and bytes − Kibibits and other prefixes |
Standing waves on a string and room modes between parallel walls |
| Ohm's law − Magic triangle − Calculator and formulae |
Room modes, Standing waves, and Vibrations of Strings |
| Computation: Amplification (gain) and damping (loss) in dB |
Room modes − Standing waves in air − Bass reflections at walls |
| Conversion of voltage V to dBu, dBV, and dBm − dBm calculator |
Localization curves for loudspeaker stereophony |
| Conversion: Frequency to wavelength and vice versa |
Active Audio Filter − Low cut − high cut − bandpass |
| Converting Distortion attenuation dB to THD factor in percent |
Comparative representation of sound field quantities |
| Conversion of Reverberation time RT60 to Sound Decay Rate |
Calculation of the air damping − formulae |
| Resistor pairs − reverse engineered calculator |
Conversion: Magnetic flux in nWb per meter to flux level in dB |
| Calculation: Voltage divider − open-circuit and loaded |
The Formula Wheel of acoustics − The most important Formulas |
| Calculate unloaded voltage divider |
The Formula Wheel of Electro Engineering − The most important formulas |
| Parallel resistance calculator |
Decibel (dB) to percentage (%) converter |
| Cross-sectional area to diameter for round wires and cables |
Weight conversion milligram to kilogram and liter |
| ● Sound and distance − sound pressure and sound intensity |
Volume conversion milliliter to liter and kilogram |
| ● Decreasing of the sound level with distance r |
Time conversion millisecond and second |
| Conversion: Loudspeaker sensitivity to efficiency in percent |
Length conversion millimeter and meter |
| Weighting filter calculation: frequency − Weighted dBA and dBC |
Calculation of body length and height (size) foot-inch |
| Convert decibels to voltage gain / loss − amplification / damping |
Conversion: Prefixes Conversion: Temperature |
| Calculation of phase angle, time delay, and frequency |
Conversion: Length Conversion: Time |
| Conversion nepers to decibels and vice versa |
Conversion: Area Conversion: Energy |
| Sound pressure and the inverse distance law 1/r |
Conversion: Volume Conversion: Power |
| Sound intensity and the inverse square law 1/r² |
Conversion: Weight-Mass Conversion: Density |
| Calculation of absorption of sound by the atmosphere |
Conversion: Pressure Conversion: Acceleration |
| Normal curves of equal-loudness level contours − ISO 226 (New) |
Conversion: Force Conversion: Velocity-Speed |
| gif file: ISO 226:2003 − Equal-Loudness Level Contour Curves |
Conversion of m, cm, inch, feet, and yard − metric and inch ruler |
| Fletcher-Munson is not Robinson-Dadson |
Conversion of Bel to Decibel and more ... |
| Calculations of overtones from fundamental frequency (harmonics) |
Is this a prime number? |
| ● Interconnection of two units − Voltage bridging − Zout < Zin |
Calculate logarithms |
| dB chart for voltages and powers |
Unit Conversion Table − Conversion of units |
| dB dBu dBV − Comparison Table for PPM and VU meters |
Alphabetical list of conversion factors |
| Calculation: Damping of bridging and damping factor |
Radians to degrees conversion and back |
| Terms of Audio Engineering and Acoustics − English and German |
SI derived units (SI based units) |
| Calculator: Conversions of pressure units |
Quadratic Equation Solver |
| ● Loudness/Volume − Sound level definition and the change of factors |
Time addition calculator − add time together |
| ● Amplifier, loudspeaker, and ohms − The misunderstood topic |
BPM − Beats per minute − Counter and calculator |
| ● Sound pressure and sound power − acoustic power and temperature |
Comparing inches and centimeters |
| Visualization of Microphone Systems − Calculation of Δ L and Δ t |
Conversion of °C (Celsius), °F (Fahrenheit), K, Rankine, and °Reaumur |
| Combining levels of one-third octave bands to octave band |
Temperature comparison: Celsius and Fahrenheit |
| Convert number relations (ratio) to decibel (dB) level |
English and American Measures to Metric Conversions |
| Comb filter − Dips and peaks − Delay time and Interference |
Conversion of radio frequency to wavelength and vice versa |
| Pitch change by temperature change (variation) |
Calculation of the extension angle of the orchestra |
| Measurement of input impedance and output impedance |
● Compare sound power and sound pressure in a distance |
| Jecklin disc − a stereo microphone array with isolating baffle |
David Griesinger − the man behind reverb algorithms |
| Sound pressure level SPL and permissible exposure time for noise |
Sengpiel − mentioned in papers of the AES |
| Questions to sound waves and the amplitudes with right answers |
Filter slope or steepness (dB/oct) is really not bandwidth |
| Calculation of the wavelength of an acoustic wave in air |
Direct field D (Free field) and Reverberant field R (Diffuse field) |
| The human perception of loudness - Loudness factor gain ratio |
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| Formula symbols of electrical engineering & electroacoustics |
How do Sound Pressure Levels add when listening? |
| gif file − Vowel Diagram or Vowel Triangle − The first two frequencies |
Vowel Diagram − The first two Formant Frequencies as Triangle |
| EBS Stereo Microphone System − Equivalence Stereo |
Adding Amplitudes and Levels |
| "Live End − Dead End" − Thoughts about the Reflexion Filter |
Conversion Chart of BPM tempo and delay to time and frequency |
| "Kaotica Eyeball" − A negative development |
BPM - Beats per minute counter and calculator |
| What is an amplitude? Which amplitude exactly? |
prefixes | length | area | volume | weight | pressure | temperature | time |
energy | power | density | velocity | acceleration | force |
| Many Amplitudes − The Sound field sizes of a plane wave |
● Go to German audio technology calculations 1  |
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| Positive input, errors, or criticism of my websites − please mail to: |
● Go to German calculations 2 Geometry in German 3 |
| → → → eberhard "at" sengpielaudio.com |
● List of some CD recordings ● List of recorded artists |
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