Antipodes wrote:I've read your comments on matching resonance to amp type. Could you say some more about the Feedback control and what settings of the Res/FB controls are suitable for the Recabinet 3.5 setup.
I've avoided going into this in the manual, as I didn't want to confuse the user, so get prepared for some potentially mind blowing stuff
The thing is: feedback and resonance, on a real power amp, are strictly connected, since the feedback reduces the effect of the speaker resonance itself (without going into technical details, you can search infos regarding negative feedback theory, if you want to know more).
In fact, that's why a Mesa Rectifier, in Modern mode sounds scooped: the feedback gets disconnected and the resonance effect increases by a considerable amount, causing the mid scoop by "boosting" lows and highs.
In TPA-1 I used a trick to make feedback and resonance effect independent, to increase versatility and make TPA-1 work with every cabinet IR.
You also have to consider that tube power amp based IRs (like Recabinet, iirc), already contains the feedback effect (and then Presence and Depth as well, if the power amp has those controls), so Presence and Depth on TPA-1 may be seen as redundant, but since they're designed to give a pretty flat frequency response when setted to 5/10, if you leave them at default settings you can consider them transparent and use TPA-1 without touching them or tweak them for some additional tone shaping.
Your next question could be: if feedback is already "printed" into the IR, shouldn't I set it to zero on TPA-1? The answer is no, because zero feedback would mean a different dynamic response of the power amp. Remember that IRs capture just the static behaviour of a system, so the feedback effect in the IR is just a matter of frequency response, not dynamic response.
Ok, if you're confused right now, it's normal
As for Recabinet, since the IRs were captured with a tube power amp (please remember that I'm not 100% sure, you'd better aske the developer!), you should set the resonance to zero (or very low values for some additional refinement) and the feedback to max (or adjust it to taste).
Antipodes wrote:Are the dynamics controls redundant in this case or are they working on a different aspect of the system?
The Dynamic control on recabinet should be related to the speaker simulation, so no, it's not reduntant.
Last suggestion for everybody: don't let all these technical details limit you in any way! A great tone is what matters, if you need to use weird settings to achieve it, who cares?