1. How does recording with modern mics, digital audio and modern speakers stop an instrument from oscillating/resonating?
2. A system (or speaker) with a resonance which might be similar to one instrument or sound would necessarily not be similar to the resonance of other instruments/sounds. The resonance of each instrument (including the human voice) is different, are you suggesting a system/speaker with a resonance the same as a violin, another system with the resonance of a trumpet and so on ad infinitum?
3. If an instrument resonates (and I can't think of any acoustic instruments which don't) and if we can accurately record and reproduce that instrument, which must obviously include it's resonance, why would you want to add another resonance in addition? How would say a violin with double it's resonance "truly sound life like"?
4. Then surely the solution is more accurate headphones, not less accurate/linear ones with a particular resonance similar to a violin?
1. It doesn't. I was observing the modern reproduction chain, and how it lacks a sound behavior native to instruments.
2. No, obviously too costly. I've invested in a neutral system "first and foremost", but a loaded horn bookshelf for certain music would be nice to have for the right money.
3. You'll always capture the frequency of resonance with an accurate system, but dynamics, imaging, and attack of trumpet can be aided with the resonance of a loaded horn. I tend to lean toward treble emphasized headphones when listeing to violin, and think one that emphasize mids sounds great with cello. Variation from perfect accuracy can help some instruments sound more life like. The problem is picking a system for each instrument, so for value reasons neutrality is an ideal baseline.
4. Ideally, but "more accurate headphone" is kind of a loaded term. For instance, I think DT880s are neutral, but some people disagree, and think it has treble emphasis. Lots of people say the HD600 is neutral. I think it distorts the mid range, albeit pleasingly. Both headphones are pretty close to what most people would regard as 'accurate' though, both of them recommended often as monitoring headphones, but even in their case there's some major range in the interpretation. I own both, and find they excel at different things.
Accuracy and neutrality are important, but I think the point being made here is coming from a different perspective, and you're applying a traditional one about sound reproduction in order to try to understand it. To illustrate this, I know they sell pianos with robotic mechanisms that can play pre-programmed songs. So imagine that we managed to record not only the sound of Glen Gould's Variations in sound waves, but the exact inputs he made to the piano, down to thousandths of a second or mm resolution. We then took an example of Glen Gould's grand piano and hooked up a robotic mechanism that could recreate the timing and movement of the performance we recorded. We also played back his performance through the most accurate set of speakers we could find for the same cost of a his grand piano. Which would be the more "accurate" rendition? It's two completely different approaches, but in my opinion, there's no way the speakers could ever reproduce what the piano could. Yes, there would be deviation form the actual performance, and we would be missing the environmental acoustics, or Glenn Gould's humming, but we would gain a true representation of the resonance characteristics of that instrument. With millions of dollars in robotics and quality instrument purchases, you could have an amazing virtual orchestra that no speaker could ever beat. Perhaps an extreme way to illustrate the idea, but along the same vein nonetheless.