I found many threads related to 035Ti and 035TiA, but nothing specific on 035TiA-1 which is what the 250Ti BQ indicates.
Are the two (035TiA and 035TiA-1) the exact same drivers? If yes, why would JBL bother with the "-1" if it has no significance?
I removed one of mine to take a look on the back and here's what it looks like.