All 3 are (to my tastes) bassy, warm IEMs with a very good mid-range, and subdued non-fatiguing treble.
In order of quantity of bass T10i >> A81 >> A71
IMO the T10i needs a significant cut in bass to shine. A81 needs a cut in bass to meet my personal tastes, and I guess also for most people looking for balance. And I'm evaluating the A71 at the moment. I'm seeing overwhelmingly positive feedback to them so far - and I can see why (the...