jonnyb wrote:
It seems to me that this is an inherent flaw of the type of ANC used in the H8. I found this helpful explanation of the different types of ANC on the Jabra website:
http://blog.jabra.com/anc-headsets-arent-all-the-same-three-types-of-anc/
It would appear that B&O went for the 'Feedback' type, where the ANC mic is inside the ear cup (as we can see when the pads are removed)
So, is the problem that the ANC mic is too close to the speaker, and all it takes is a little push to cause the feedback?
I assume they're using the hybrid approach. My reasoning is that there are microphones on the outside as well, at the back of the earcups. Also, they are damn annoying to wear with ANC on in windy weather, as the ANC picks up wind noise and sends "anti-wind-noise" to the ears, which incidentally sounds just like wind noise. I assume this would be an outside mic, since, at least to me, it does not feel windy inside the earcups :)
I also assume this may be a good thing, since it probably means they have more variables to tune for any software updates, provided it has any kind of priority. I must admit that to me, the ANC is less useful than I anticipated - I'd almost say I only use it for transport. This is a combination of the headphones having quite good passive noise isolation, the aforementioned problems with wind noise, the heel strike bumps and that I prefer the sound signature without it.
Overall, this is okay to me, I've come to the conclusion that they are only useful in that mode when inside and sitting still (and a little when vacuuming). Then again, I have no feedback problems, so at least it's working some times, and not actually harmful. It's also a bit annoying that I have to turn it off every time I start using the headphones.