The more sophisticated method is specific tools that emit a calibrated sweep tone and capture the result, then use special processing to convert the captured audio into an impulse response. I have played with this and had to do a bit of messing around with the result in Audacity to clean it up and get something usable - and even then it often doesn't sound that much like the real cab (but it can nevertheless be interesting and useful). but it can be a bit crap in practice and hard to get decent results from. This 'ghetto' method is simple and the resulting WAV file can often be loaded directly into convolution plugins without much further processing. And choose the cleanest and most accurate amplifier you can (ie not a guitar amp!). So choose a mic and position that you would actually use for a guitar cab. There is a big catch here in that you are capturing the character of the amplifier and the mic along with the mic's position. The ghetto method is to send a very short sharp impulse - a click (essentially a very short square wave) - to the cab or into a space and then capture the 'impulse response' via a mic.
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