[Haidar]

Is there a gadget that can be plugged into a 1/4 inch headphone jack and will display the output impedance of the amplifier?

 

[dunring]

Theres impedance meters that can do it. Also on audiosciencereview they've tested most amplifiers for it also. Most manufacturer spec pages I've seen are pretty accurate on that number.

 

[Haidar]

Is there a relatively inexpensive impedance meter that you could recommend?

 

[Tjj226 Angel]

Is there a relatively inexpensive impedance meter that you could recommend?

You could just use a dummy resistor and a multimeter and get a close approximation for cheap.

But why are you doing this and what do you want to achieve? Are you having a problem with an amplifier?

 

[Haidar]

I am looking for a fast and easy way to test the output impedance of headphone jacks. Is there a plug and play solution that doesn't require any other resistors or calculations?

 

[lantian]

Oscilloscope