Ben Johnson
SSSSSSSSSSSSSS
Sure. This explains everything.
Just kidding.
How an impulse is made:
You run a sweeping sine wave (20Hz-20KHz) from your computer's audio interface into the power section of your amp (effects return) or just a plain old power amp that's run to a cabinet.
You'll have your cabinet mic'd up in order to capture the sweep and send back it to the computer.
Okay, so now you can see that the only difference between creating an impulse response and just playing your guitar through an amp is that your guitar has been replaced by a sine wave generated by the computer.
So now that we have a wave file that's been run through the power amp and cabinet. At this point we process the file with a program called Voxengo Deconvolver (the one most windows users have). Deconvolver takes the new sine wave and subtracts it from the original sine wave. By way of the superposition principle, we are now left with the impulse response, which can be loaded into a free program called Voxengo Boogex to use as a cabinet simulator with a dry preamp track. The differences between a guitar signal run through an impulse versus a mic'd up amp is almost imperceptible.
Just kidding.
How an impulse is made:
You run a sweeping sine wave (20Hz-20KHz) from your computer's audio interface into the power section of your amp (effects return) or just a plain old power amp that's run to a cabinet.
You'll have your cabinet mic'd up in order to capture the sweep and send back it to the computer.
Okay, so now you can see that the only difference between creating an impulse response and just playing your guitar through an amp is that your guitar has been replaced by a sine wave generated by the computer.
So now that we have a wave file that's been run through the power amp and cabinet. At this point we process the file with a program called Voxengo Deconvolver (the one most windows users have). Deconvolver takes the new sine wave and subtracts it from the original sine wave. By way of the superposition principle, we are now left with the impulse response, which can be loaded into a free program called Voxengo Boogex to use as a cabinet simulator with a dry preamp track. The differences between a guitar signal run through an impulse versus a mic'd up amp is almost imperceptible.