I've purchased them as a replacement for my Adam T5V, mostly because of the smaller size. I use them on my desk in a well-treated acoustically room.
I must say, that the low frequencies are very poor compared to Adam T5V. If you listen to T5V and A4V side-by-side, you can hear that there is almost no bass with A4V :(
There are buttons on the back side of the speaker, technically they should increase the bass and the treble, but those buttons has close-to-0 effect. They almost do nothing.
I want to emphasis that I only compare those A4V speakers to cheaper T5V variant and I must say - A4V are not worth the money absolutely. Do not get tricked with the "A-series marketing", A4V will disappoint you if you upgrade from T-series.
If with T5V I did not have to purchase a sub-woofer, with A4V now I have to, the sound is very flat.
So TLDR:
- very overpriced product
- poor low-frequency response compared to other similar cheaper monitors
If you are a big fan of "flat frequencies" - you are probably going to like it, but there are significantly cheaper alternatives.