Here's a Headphone Power Calculator spreadsheet: You input your headphones' impedance and sensitivity (in either dB milliwatt or dB volt and it calculates the other sensitivity value). It also calculates the power and current at 1 volt rms. Input a target loudness and it'll give you the...

The Robinette Box   Front panel features balanced 4-Pin XLR, 1/4" & 1/8" single-ended headphone jacks, 'Amp Mode Switch' and optional oscilloscope out BNC connectors.   The Robinette Box© is a headphone to speaker amplifier interface box which will connect just about any headphone with...

I have created a JavaScript webpage calculator and Excel spreadsheet that will help you optimize a headphone resistor network interface for your headphones and your speaker amplifier.  Instructions A headphone resistor network interface helps to electrically match a pair of headphones to a...