I run a calibration of this against the GRAS 45CA I have back home and with careful use you can be pretty damn accurate. For the money this is awesome, especially for over-ears, for in ears you need to be careful. headphone measurement system (custom calibration). Is this the proper hook up to get the loop for calibration: (a) from.
For when you need to capture some I2C etc. TrueRTA Audio Spectrum Analyzer Software TrueRTA s audio spectrum analyzer.
Portable Soldering iron, this one runs off almost any available voltage.Also I modified it for a lower impedance headphone out. Behringer UCA202 USB Audio interface (modified), I added tiny 1:1 audio transformers (Neutrik NTE1) and DC blocking caps to allow me (with a calibration) to measure filters etc.Sharpies, silver is great for writing on plastics, red for those super rare occurrences when it is necessary to indicate to someone that something is wrong.USB rechargeable torch/light (Rolson) for looking into those dark spaces.Victor VC921 True RMS Multimeter, I like this one just as it has a flappy cover and captive leads.The essentials Laptop, Mouse and a USB hub.