I'm sure that's true, but my reluctance to use DSP room correction, even for small adjustments as you suggest, is because (with a full-range amp system), the ENTIRE frequency range has to pass the DSP - there is no "bypass for higher frequencies" - and it's a signal processor that I don't want any more than other signal processing such as tone controls. I prefer not to process my incoming signal any more than is absolutely necessary.
I can understand your disappointment with using DSP but its unclear to me what the signal chain looked like in your system while playing with DSP? This is in reference to your mentioning that there is no "Bypass" for Higher Freqs?
If you are talking about using a Turn Table as the Source then you are also talking about doing an A/D conversion prior to any DSP taking place. If that were the case, then I would be curious to know what kind of A/D converter was being used to make that change from A to D? Was it something "Hi-End" ? What are its specs? Could it be a contributing factor to your less than favorable view of using DSP?
Its also unclear to me if your experience with using DSP was via a box with "Baked In" DSP or if you have actually used any of the latest SOA DSP options, created the filters, took the measurements..etc? If you have tasted both options, you still walk away unimpressed?
With the "Good" DSP, you can absolutely Bypass (ie..not touch) the High Freq's if that is what you want to do. The skies the limit if your willing to put in the time to get there.
We cant base all DSP off of how some box used some "Auto Function" or equivalent to dial in some room and then it not offering any clues of what exactly it did.
Were not talking about Disco Mode or Stadium Mode here are we?