Just want to share my experience with Dali IO-6. I had them for a week before sending them back (this was few months ago, I just go myself to write something now).
These headphones are fairly neutral and unfortunately for me sounded rather dull and "closed". I liked their bass response, but only if I had my glasses off. With glasses on, and I have thin frames, the bass dropped ridiculously. The vocals were nice, very melodic and smooth, I liked that also. Nevertheless, every time I put my wired Beyerdynamic DT 770 after Dalis and they sounded so much better, like taking the veil of the music, so much more specious. I might still have kept the Dali's, in fact I didn't mind having another pair of cans sounding differently, but I couldn't get around their comfort, or lack there of.
After 5 minutes the top of my head would start hurting and get progressively worse, there was too much pressure there. After 15 minutes my ears were getting too warm and sweaty and the small earcaps too noticeable. Effectively no mater how much I'd have enjoyed the sound every time I put the Dali's off it was such a relief. Additionally, these are wide headphones, they look a bit silly on the head.
Connectivity was great, no issues whatsoever, I liked the battery info when turning them on. Controls where fine as well. The build quality was generally very good, I liked the feel of Dalis, very premium. However, there was something inside the top padding coming off. I could feel it through the cushioning and push that in, but after some time it'd come off again. I think others had similar issue few months ago.
ANC was poor. It only blocked the low frequencies and even that not fully. There is no comparison with Sony WH-1000XM3, different league. Having said that I would not bother with IO-6 and recommend IO-4 instead. Passive noise isolation is pretty good.
To sum up, if you can get around the comfort issues (eg, have smaller head/ears) and like sound leaning towards neutral with smooth vocals and don't need ANC, go get Dalis. If ANC and comfort is important, I think WH-1000XM3 are still the cans to get, you just have to suck up the boomy bass.
These headphones are fairly neutral and unfortunately for me sounded rather dull and "closed". I liked their bass response, but only if I had my glasses off. With glasses on, and I have thin frames, the bass dropped ridiculously. The vocals were nice, very melodic and smooth, I liked that also. Nevertheless, every time I put my wired Beyerdynamic DT 770 after Dalis and they sounded so much better, like taking the veil of the music, so much more specious. I might still have kept the Dali's, in fact I didn't mind having another pair of cans sounding differently, but I couldn't get around their comfort, or lack there of.
After 5 minutes the top of my head would start hurting and get progressively worse, there was too much pressure there. After 15 minutes my ears were getting too warm and sweaty and the small earcaps too noticeable. Effectively no mater how much I'd have enjoyed the sound every time I put the Dali's off it was such a relief. Additionally, these are wide headphones, they look a bit silly on the head.
Connectivity was great, no issues whatsoever, I liked the battery info when turning them on. Controls where fine as well. The build quality was generally very good, I liked the feel of Dalis, very premium. However, there was something inside the top padding coming off. I could feel it through the cushioning and push that in, but after some time it'd come off again. I think others had similar issue few months ago.
ANC was poor. It only blocked the low frequencies and even that not fully. There is no comparison with Sony WH-1000XM3, different league. Having said that I would not bother with IO-6 and recommend IO-4 instead. Passive noise isolation is pretty good.
To sum up, if you can get around the comfort issues (eg, have smaller head/ears) and like sound leaning towards neutral with smooth vocals and don't need ANC, go get Dalis. If ANC and comfort is important, I think WH-1000XM3 are still the cans to get, you just have to suck up the boomy bass.