They have to be 'on' for them to work at all. I've not let the battery run down that far, so I can't say if they work with a dead battery. However, I'm pretty sure they charge while listening. Regarding passive isolation, it would probably be ok. I guess it would depend on how loud you like...

For those looking at the M4's...please post your thoughts & comparisons as soon as you've had a chance to listen. My return period for the PX7 S2s is early September. :relaxed:

I just received the Silver S2's. Am enjoying them more than Sennheiser Momentum 3 & VModa CF2's. ANC is better than SM3's but not as good as my Sony XM3's. I only use the XM3 when ANC is a priority...was never too impressed with their sound. But the S2s sound great (never tried original...

THIS! Anyone else having issues with connection when removing them from case & very loud white noise? More often than not, both buds will not connect on first try. At least 1/2 of the time when connection fails, I'll get white noise from one bud or the other, but never both at same time...

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Yes, very similar. Hate the buttons as they are mushy with no satisfying click when pressed.

I may be returning mine as well... 1. when I first put them on, my first thought was 'I need to shorten the headband'...but I found they were already fully collapsed. I have a large head, having to expand the CFW2 several clicks for the earpads to sit right. With these, I felt that they were...

Thanks to all for posting initial thoughts. For those that have received already, any of you order from Amazon? Or VModa? Mine (from Amazon) still haven’t shipped but a delivery date of Saturday...that date is from January pre-order. Have shown out of stock for weeks though.

Great, thanks for the info.

Also...are the shields interchangeable between M200 ANC and the other models?

How are the ear cups compared to the CFW2? Are they sized like what ships with the CFW series? Or are they closer to the XL versions?

Re: Cold Weather Issues As I've read a number of posts regarding cold weather performance of the XM3s, but had not taken them outside, I did a simple test today, located in central Missouri - temp ~30F, win < 10mph. Was listening to song1 as I went outside. Before song1 was over, Siri had...

I've owned the CFW2 since they were released and have had no issues. From a hardware perspective, i think they durability is unmatched. However, I've also owned the Forza Metallo Wireless since they were released and I'm now on my 4th pair due to electronics issues.

I listen to a lot of Papa Roach, Shinedown, etc. After dialing the bass BACK some, i think they sound great. EQ settings I use are posted earlier in the thread.

It is my understanding that in the XM2s, the headphones would shut off after 5 minutes without a source. With the XM3s, the DEFAULT is shutdown after 5 minutes, but you can disable this (within the app). So to answer the question, yes you can use ANC without a source.