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Old 2 weeks ago
Lives for gear
Yuri Kogan's Avatar

Originally Posted by grannis View Post
an admirable aim that appears to be going sideways already. Maybe it's worth elaborating scientifically on what you mean by non-linear?

In strict mathematical terms, no, IRs are not linear - but then not much is - only straight lines!

I'm pretty sure you don't mean that, but I'm not sure exactly what you do mean.

btw, computerised models (and I don't mean IRs specifically, which are relatively simple beasts in the modelling world) have no problem with non-linear modelling per-se, so again, if you can define what you mean better, we may get somewhere.

fwiw, whilst I do use a Helix and IRs, I always supplement it with a tube preamp which adds some - er non-linearity(*) that disguises the digital nature of the distortion.

What I mean by that, is that I hear digital distortion as too uniform - it's like it's been quantized at a very short tempo. The tube breaks up the pattern enough to my ears to sound a whole heap better.

Clearly I am not talking about speakers, so my analogy is not perfect to what you are trying to discuss, but I thought it might illustrate my point about needing to be more precise with the term non-linear.
The speaker will recreate the pre-amp gain reasonably uniformly - it does not present much of a load. The interaction and dynamics between the PA, transformer and speaker will be non-linear - it does not increase or decrease in a linear fashion, but compresses, produces its own overtones and affects dynamic response. Therein is the non-linearity