Apologies all for off topic. The bass on the a2s is probably stronger than the pros but better controlled and faster with netter sub bass.They both have a lovely punchy sound coming from a bump in mid bass. The pro excels in detailed mids but the a2s with its BA surpasses them in detail and resolution. The treble is not as forward as some other iems but has all the detail youd expect of a BA just smoothed off a little in comparrison to the mids. Soundstage is narrower on the a2s but not as much as some have stated. They really need a lot of burn in and they start to shine IMO and i burn in by listening. Instrument separation is above average after burn in IMO. They have very similar signatures ie. Smooth but detailed, but the a2s has that extra touch of finesse to it (timbre attack decay and resolution) and is my favourite iem at the moment. I'm curious about the ATR but already have the ATE. Does anybody have both and can explain how they're different?