Audio wizard is a collection of audio related tools. It's very much a work in progress and will be updated frequently.

Requests, bugs, etc you can me via the menu. Currently here is a list of what's available:

Acoustic power
Air absorption
Amplifier power required
Bracing
Ceiling speaker coverage
dB to Volts
Delay and frequency
Inverse square law
Ohm's law
Port volume
Power ratio
SPL (sound pressure level)
Volume
Subwoofer cone area
Thermal noise
Voltage ratio
Vent length
Speaker impedance calculator
Frequency to note
Time stretch
Loop length to BPM
Frequency wavelength