I bought this headset from a reputable source. They are given as headsets good for crystal radio with 2000 ohm impedance and of course that's exactly what I am going to test. So I bought these headsets with my own money, nobody has paid me to do this video. This is my fun in my spare time. I will measure them with a network analyzer and I have set the sweep from 400 kHz to 1.8 MHz covering the AM broadcast band. I had to do some DIY work and have to create an adapter and I had to create my own termination set for the calibration. I will test the headphone now. So this is a 50 ohm termination and it is right where I expected to believe and the value is 50 ohm at roughly 500 kHz. The measurement of the headset and the display will settle down in a moment. At the same frequency I have a read of value of around 2000 ohm. So they do what they say. I am very happy with that. I had to do some DIY work as explained and build the termination. This is the 50 ohm calibration that I created. These are three resistors each with a value of 150 ohm in parallel. So with a quick math that gives me a value of 50 ohm which as seen is correct and displayed in the right place which we expect. For fun and just for reference 2000 ohm termination and that's gone off scale of course but it's where I expected to be and the value is around 2000 ohms as expected fine with that. Let's plug in the headset again. That's what I was trying to test so that's what I like to see. The other terminations just for the sake of it the short is shorted and the open is open. That's it for the 2000 ohm headset. While I was at it I decided to test these so-called high impedance earpieces just for the sake of it they did not come with a value. So I said why not let's have a look. So let's do that and try and look at what value I get back from them and there is the connection. It's wait for everything to settle down. Well that's under 1000 ohms so that would be 1 kilo ohm in fairness. There is some wire. So there is some distance that's the ground plane which I calibrated the device at so if I would add take or leave 10 nanoseconds delay well let me try that out. So electrical delay let's do that 10 nanoseconds so there it is. So let's give that you know a benefit and let's say that they could be at least I can expect them to be around 1000 ohms. Certainly not the 2000 ohms of the headset just for the sake of completeness I am taking the measurement at 500 kilohertz approximately and I will not go. Oh let me take that delay out electrical delay has to be taken out otherwise we're off. There we are back to our 2000 ohm a little bit more 3000 ohms let's give it time to settle down and so that put me off. Yes I was about to say I take the measure at 500 kilohertz and I will not go into why this measurement is going down this curve I could take each measurement or I could plot the software in a software plot the data in a software and have it spread out measurement by measurement frequency by frequency. I will not do that right now that's beyond the scope of my test I'm happy that I can measure that these headphones which I have bought for you for crystal radio high impedance 2000 ohm there we are bingo that's it.