Just picked up a pair of P7s last night! I've been researching headphones for the past month or so, looking for a replacement for my Sennheiser HD595s, which I was never too happy with for various reasons (lack of bass, poor construction & materials mainly). I ordered and received a pair of Sennheiser Momentums yesterday (perks of Amazon being in Seattle). I, like many, was incredibly disappointed by the fit of the ear cups of the Momentums. They seemed to be half over-ear, half on-ear for me. After 45 minutes of listening, I couldn't keep them on anymore. I've been watching the P7 closely. While reviews and impressions are slowly accumulating I like what I've read so far and wanted to give them a shot to see how I liked them in comparison to the Momentums. I also wanted to give the Momentums a few days to see if the pads soften a bit. After calling three Apple Stores in the greater Seattle area I found one that had a pair of P7s in stock. Hooray! I'm going to live and work with both for a week before making a decision and sending one home. There can be only one!
I'm going to write up a big post on my extended findings, but this is a close race between the two. I have about maybe 5-6 hours of play and burn-in with each pair, so we'll see how they evolve over the next week. I'm going straight into my Retina MacBook Pro, so the addition of a USB DAC or headphone amp may change the sonic characteristics of both. If anyone has any insight into DAC/amp performance with the P7 I'd love to hear!
Here are some quick impressions:
The P7 wins for me due to my ears not fitting in the Momentum. The P7 headband is heavier, but hasn't been a problem for me so far. The clamp is good on the P7 and while the ear cup leather is stiff, I hasn't been an issue so far.
This is tough. It really depends on preference as both are excellent headphones. I listen to a lot of music. Some of the artists I've been using for testing purposes are My Bloody Valentine, Converge, Death Grips, The Smiths, Interpol, Chvrches, Kanye West, Slayer, Trent Reznor Soundtracks (Girl With The Dragon Tattoo & The Social Network), Daft Punk, Massive Attack, Yelle, The Knife, Burial, Bob Dylan, Arcade Fire, At The Drive-In, Black Sabbath, The Beatles, Boards Of Canada, and a smattering of others. So a good mix of electronic, metal, hardcore, indie rock, and pop. In my library I generally use ALAC files. The lowest quality I'll accept is 256kbps AAC from the iTunes store, but I usually seek out the ALAC. (iTunes, jump on the lossless train please...)
Momentum: Warmer, more forward, smaller but more immediate sounding soundstage, very rich and vibrant mids, kicking low end and very nice vocal presentation. Very appealing and versatile.
P7: In general the biggest difference between the Momentum and the P7 I'm finding is the P7's mids feel comparatively scooped. This makes the coloring less and a more neutral sound that feels colder than the Momentum. Definitely more airy and open. Nice detail in the treble yet not harsh. Bass is deeper in the P7 as has been reported, but it's different. It doesn't really impact and hit like it does on the Momentum. The P7 seems to be more removed in it's presentation at times. There are times when this signature really excels and makes the music feel very large.
It's interesting to see how each handle different genres. It really goes back and forth. When something really excels in the P7 it will sound much less epic and almost bland in the Momentum. When something is warm and more engaging in the Momentum it will seem comparatively cold and almost passive in the P7. I'll pick a few songs and do a comparison write up soon as well as keep posting impressions.