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You can read the specs for all differences but having owned a lot of Bise headphones I'll mention some that stick out to me. The new QC25s have gone back to an over the ear design (like the QC3s) vs the QC15s on ear design. This seems to help reduce noise that may come through your outer ear since now they seal to your head or hair. The reason I upgraded was my ear pads were deteriorating due to age (always stored in case) which was leaving black specks on my head (not cool) & wire was pulled out of minimal plug strain relief so would have failed where bending soon. Also QC headband was ridiculously wide above ear cups, & silver color sucks. Sounded great, but now you can choose color(s). Also 25s fold smaller into a retangulat case vs 15s toilet seat shaped case. Keep the dual plug adapter from old ones & store with extra batteries. Worth every penny.
Sorry, there was a problem. Please try again later.One main difference is that QC25 still works in passive mode when its batteries run out unlike the QC15. I find that the QC25 has a better build and better sound but same outstanding ANC feature. Hope this helps.
Sorry, there was a problem. Please try again later.older model most likely the Qc25 has better drivers inside and noise canceling
Sorry, there was a problem. Please try again later.The new ones look nicer, they fold up smaller and they will work without the battery.
Sorry, there was a problem. Please try again later.This is the upgraded model. Not sure it would be worth the investment to upgrade.
Sorry, there was a problem. Please try again later.Probably not a whole lot of difference sonically, since model upgrades are usually subtle. Do the 15's have the inline phone compatibility? That might be the really big difference. I don't really use that, but if it's important to you, that might be the big difference. I'm only vaguely familiar with the 15's, so you might want to do a little more research. Sorry!
Sorry, there was a problem. Please try again later.One difference is that the QC 25 can be used without noise cancelling or when the battery is dead whereas the QC 15 can not.
Sorry, there was a problem. Please try again later.The new QC25 are much lighter and more compact when folded than the 15's. Great sound. Definite recommend.
Sorry, there was a problem. Please try again later.Not a lot. I have the Qc 15's and got my husband the Qc 25's for Christmas. The sounds is equally as good but the 25's headset piece adjust a bit better.
Sorry, there was a problem. Please try again later.25s are much more comfortable, in my opinion. The are also lighter, and have a much nicer case. Only thing is the are not as loud, but that didn't make a difference to us, happy with upgrade.
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