I had the B&W P7's and while I loved the sound, they were quite uncomfortable to wear for more than about 30 minutes. Additionally, they hiss at all times when using the BT connection. Can any of you that have the Onkyo comment on the background? Is there hiss or static? Is it completely black and silent? A secondary use of the HP for me is for listening to podcasts, and with spoken word, there is a lot of gaps in conversation (silence), where it's just full of hiss (on a P7). Thanks in advance for your feedback.
Here's a post I wrote on the B&W P7 Wireless thread about a month ago after the same topic was brought up;
"The hiss you can hear is the headphone amp, I've tested over 20 pairs of the very best Bluetooth headphones and they all have it to some degree or other.
Many headphones hide it by switching off the amp when they can't detect a signal meaning the only time it can be heard is when it's being masked by the audio. The hiss will only then become apparent during quiet parts of a song or just after a song finishes or as the headphones are turned on.
I use Bluetooth headphones a lot for watching movies and the hiss becomes very apparent and quite distracting during spoken parts. This is one of the main reasons I've spent so long looking for the right pair!
One solution is to reduce the volume on the headphones and increase the source volume but this can create audio clipping (distortion) especially in the bass, however I find the P7 wireless cope very well with a lower volume and the hiss can be reduced to about a quarter. With the volume reduced they have one of the lowest levels of hiss I've experienced. The Onkyo H500BT's are also very good as are the majority of Sony's with the Sony XB950BT's having the least hiss out of all the headphones I've tried!
With my Bluetooth transmitter (Avantree Priva II) connected to my TV the P7's are always detecting a source and the hiss can always be heard whether any audio is playing or not. When connected to my iPhone the hiss can only be detected once a song starts but is hard to hear through the music.
If I have the P7's connected to the Priva II and start with the volume on max, I can then with each press of the volume - button reduce the hiss gradually until around half way when the hiss level can't be reduced any further. If I get any distortion then I can gradually up the volume until I find the right balance between headphone and source volume.
It's also worth mentioning that all songs/movies will have some sort of background hiss produced during their original recording, this shouldn't be confused with the headphone hiss. Some recordings are far worse than others, especially many older recordings.
Hope this helps!"
Also in answer to your question the Onkyos have one of the least noticeable hiss that I've experienced.
Another interesting thing is that I've recently been playing around with different pads for the P7's and this actually reduced the hiss significantly as the stock pads are rather thin meaning your ears are very close to the driver and cause the amp hiss to be far more audible!