Bloom air around instruments

Add a filter choke to the preamp and amp and that will get you to understand how things begin to work and sound.

Happy Listening.

I've never heard audiophile "air" at the thousands of live acoustic (not amplified in any way) concerts. I think, in general, it's probably a pleasant artifact of recording and reproduction.

That’s where recordings are better than live acoustic performances on a good system. 

Lowering the noise floor by having clean power through the mains will reveal air and ambience on the recording. Also vibration control on components and rack, and an acoustically treated room will reveal air and more in the recordings.

How do you get air around instruments

Do you mean get the speakers to disappear?

Get better speakers. Most speakers have horrendous time coherence.

As a former recording engineer, I can tell you that there is no 'air' in the studio. In good rooms like Paramount, Sky Walker, Hit Factory, Oceanway, Capital A, etc. an acoustic guitar or piano sound much as it does in a small club.