Is it possible to create an IR Impulse Response WAV file (FIR speaker cabinet frequency response profile) to simply remove top end from the frequency response of a guitar amp modeller? It requires a 'chirp' frequency sweep WAV file.
I know an equalizer would be a simpler solution, but that can't be used in this case.
The frequency response would need to be flat up to the 3db cutoff frequency.
I've tried to edit an actual speaker IR file to flatten it out in the lows & mids, but the results were not very good, so that's not an option.
I've also tried simply equalizing a flat FIR WAV "chirp" sound file and loading that. Also sounded terrible for some unknown reason.
If it's possible - what software would be recommended to create the file?
Ideally, I'd be able to create an IR from scratch, and determine the cutoff frequency.