Jeah. An A/B Test would be really nice. I have my helix for about 4 days now and I’m very happy.
But now I want to buy a pair of FRFR and on my list is the Alto 312 or the 310. In Germany the headrush cost a bit more than the Alto and not every shop has it.
But I red some good stuff about the 310 and it should be „less boomy“...
Maybe the 310 is the best choice between the 312 and the headrush.