Power amp models and the lack thereof

[paisleywookiee]

power amps are one area I'd think NAM would be great for.

 

[jay mitchell]

That said, FAS should absolutely sprinkle the fairy dust over some dedicated rack PA classics. (VHT 2150, Mesa 2/90, Marshall 9200 etc.) I have a hard time believing that would in some way jeopardize the FAS modeling methodology.

I've got no dog in the fight, but I'll point out that the explanation of Cliff's I described was offered more than a decade ago. I have no clue as to his present thoughts on the matter.

 

[synthpenguin]

power amps are one area I'd think NAM would be great for.

NAM is definitely excellent at it!

 

[synthpenguin]

fwiw I was reading the Fractal wiki and it actually provided these two relevant quotes from @FractalAudio ~

From 2024 (emphasis added by me):

One thing I have contemplated in the past is a switch that allows you to, for example, output the preamp on the left channel of the amp block and the power amp on the right. It's not possible to run the power amp separately from the amp block though. It has nothing to do with proprietary technology or IP, it's an architectural limitation.

Wish - Power Amp Modelling assignment to outputs

Will be nice to select power amp simulation for different outputs separately. This will give a flexibility to enable power amp modelling for FOH and disable for an output goes to TubePower amp. This will solve a problem with shared backline for venues.

forum.fractalaudio.com

And I’m not sure that this is still relevant, but from 2016 / Axe-FX II and re: adding an FX loop:

It's not impossible but it has implementation difficulties. The main problem is that the amp block is nonlinear and therefore oversamples the data. Any effect inserted between the virtual preamp and power amp would need to also run at the oversampled rate which means many times the CPU usage. For example, if the amp block is running 8x oversampled then the CPU usage for any effect inserted would by 8x as much (I'm not going to disclose our actual oversample rate).

The other way is to dowsample back to native sample rate, run the effect(s), and the upsample again. No problem right? Except the no-free-lunch theory gets in the way. Downsampling and upsampling add latency.

Axe-Fx II "Quantum" Rev 2.00 Firmware Release

I did. No change. did you upgrade to 3.5?

forum.fractalaudio.com