Real owners lean toward the Beyerdynamic DT 900 Pro X: 71% of 234 owners recommend it, vs 56% of 18 for the Sonos Ace Ultra.
Verdicts aggregated from Reddit, enthusiast forums, and YouTube owner comments — affiliate reviews excluded. Sample sizes differ; judge accordingly. How we score
“I bought the 900 proX as my first high end headphone for mostly gaming and music. They caused me to spend another 2k on speakers and a schiit stack because id never heard such beatiful sounds. Worth it”— @Lperry on YouTube
“900 sounds more natural, intimate and less fatiguing but it doesn't stage the same way.”— Bret Halford on Head-Fi
“That joint is a huge weak point in my opinion.”— @drewmorg. on YouTube
“I think these sound leagues above the original Ace tho thanks to that custom dual-ring magnet motor. The bass is deep and tactile while the sound stage is far more wide and open in comparison to its predecessor.”— @ventus77777-h on YouTube
“I have the Ace Ultra and i love them....especially with my Sonos Theatre system...i had the first ones and i like these ones more....no complaints whatsoever”— @SpankyGolfaddict65 on YouTube
“do NOT buy these for TV audio swap. the feature sucks. source: i own these headphones.”— @Beanz0911 on YouTube
Real owners lean toward the Beyerdynamic DT 900 Pro X: 71% of 234 owners recommend it, vs 56% of 18 for the Sonos Ace Ultra.
Owners point the Beyerdynamic DT 900 Pro X at competitive gamers needing precise footstep imaging, and home producers mixing on a budget.
Owners point the Sonos Ace Ultra at sonos soundbar owners who want to watch TV on headphones, and original Ace owners who want more bass.
The most-cited downside of the Beyerdynamic DT 900 Pro X is strong clamp needs breaking in. For the Sonos Ace Ultra, it's the TV audio link to a Sonos soundbar drops out, picks up static, or fails to connect for a few owners, and one returned a pair over it.