Aston Spirit vs Neumann U87Ai mt // Narration (m, Hartl) // rec.ID 019 

THE best sound comparison of the u87 vs Spirit. Sad that worse comparison videos have 1000s more views! Here, the speaking was proper, good fair comparison showing how the mics sound in a dry studio environment. Thank you, and glad I found your test.

I guess, noise is the answer at this point :) There is audible difference in signal to noise ratio between mics