Jay Mitchell
Fractal Fanatic
To produce my IRs, I have applied expertise in design and testing which I acquired over more than a quarter century of professional loudspeaker R&D and more than six years of physics education prior to that. I chose after serious consideration to provide these IRs to the Axe-Fx community at no charge. Given that, had I billed a customer for those services, the bill would have run to five figures, I am reluctant - understandably, I hope - to provide free engineering support to an entity that is looking to profit from the same kind of work I have performed for this community gratis.
With currently available software tools, it has become trivially easy to create a data record that appears to be a loudspeaker impulse response. Some of these "IRs" may actually sound "good" to some players. Very few, if any, of them bear substantial resemblance to a valid IR of the speaker they are purported to represent, as you would hear it while actually playing through the speaker. I have used testing techniques that are well-known to anyone with a background in acoustic testing and measurement, and the resulting IRs are faithful to the speaker/cab combinations in a way that no close-mic'ed attempt can possibly replicate. As I have stated before, I am willing to acquire IRs of user-provided speakers under the condition that I am free to share them with others. I am, however, unwilling to provide free support to someone who is selling their IRs.
With currently available software tools, it has become trivially easy to create a data record that appears to be a loudspeaker impulse response. Some of these "IRs" may actually sound "good" to some players. Very few, if any, of them bear substantial resemblance to a valid IR of the speaker they are purported to represent, as you would hear it while actually playing through the speaker. I have used testing techniques that are well-known to anyone with a background in acoustic testing and measurement, and the resulting IRs are faithful to the speaker/cab combinations in a way that no close-mic'ed attempt can possibly replicate. As I have stated before, I am willing to acquire IRs of user-provided speakers under the condition that I am free to share them with others. I am, however, unwilling to provide free support to someone who is selling their IRs.