I don’t think the DSP chip in the lower end USB interfaces is any more powerful than the one in the AXR4T/U. In fact I wouldn’t be surprised if it’s less powerful and runs less instances of the eq/compressor plugins than the AXR4T/U.
The only difference that we know of is that the dspMixFx on the lower end USB interfaces include the guitar emulation plugins. If those plugins were included on the AXR4T/U, then I’d suspect more instances of them could be run, as I imagine the DSP chip power scales with the channel count in each interface, and the AXR4 has 12 inputs… 4 XLR and 8 line ins.
Here’s a screenshot of my AXR4U with plugin slots fully maxed out, at 48khz sample rate. EQ and compressors on stereo inputs 1 +2 and 3+4, and then 2 instances of the SweetSpot Channel Strip on each of line inputs 5 - 12. You can see the DSP meters maxed out in the top right corner. Of course, there would be no reason to use 2 instances of the SweetSpot Channel Strip on line inputs 5 -12… I’m just demonstrating that the AXR4 CAN use them. I’d be curious to see how many plugins the lower end USB interfaces can use before their DSP chips max out.
