Hello all - this is my first post.
I have had such success with my P5's that I decided to sign up to Head-fi for the sole purpose of sharing the following information:
As with everyone who tries the P5's I was looking for the ultimate closed back headphones for ipod/iphone etc.
I burned them in for days using a mixture of pink noise, white noise, frequency sweeps....actual music too!
I've never been happy with the sound.
Far far too much bass...boom boom boom...muddy sound...or 'veiled' as some have described it.
Recently I started experimenting...
I took the ear pads off completely then pushed the cans against my ears and listened to some music. Obviously it was really trebley and tinny...but I also noticed it was very very detailed.
Conclusion - ear pads 'create' bass
Next I took the 'round the ear' pads off my Creative Aurvana Live cans and listened to the P5's through them. This time I got some bass back with no loss of detail. The space inside the Creative's cups is far greater than that inside the P5's.
Conclusion: The size of the cavity inside the ear pads affects the amount of bass.
Looking inside the P5's ear pads you can see that the opening for the sound to travel through has been reduced by the shape of the foam. I decided to be brave and take a pair of scissors to mine and 'open them out' to match the shape of the grill on the driver unit.
...although reckless you might say...this is the best mod I've ever done! I did it in stages and noticed the drop in bass and reduction in 'muddiness' with each iteration. They now sound almost perfect to my ears! The detail and separation between instruments and vocals is amazing for closed back cans!
I decided to see how far I could push the 'envelope'...
At this point I decided that the engineers who had likely designed the 'perfect' headphone driver were not responsible for the ear pads. Here I assumed that the goals were luxurious comfort and that this may have impeded the sound quality. You'll noticed that there is a 'void' in the upper section of each ear pad where there is no foam. I concluded that this had been left out in order to increase wearing comfort on the ears, but will likely cause internal reflections of sound. I took one of the girlfriends make-up removal pads, rolled it up into a cylinder and pushed it into this void.
This made a marginal difference, but to my ears it tightened up the bass slightly. It also makes the cans less comfortable to wear though; confirming my suspicions that the placement of the foam is to optimize comfort, NOT preserve SQ.
Finally I have replaced the cable with a section of Sennheisser HD595 that I'd chopped off months ago. The small 2.5mm jack was a pain in the bum however and in the end I bought one from Maplin, removed it from it's plastic barrel then used a hand-held rotary grinding tool to reduce it's diameter to fir the P5's cavity.
Another large step up in performance! I would say that you should be careful with cable choice here as the amount of clarity and treble may not be to everyone's liking. I tried to use 24AWG SPOFC Van Damme microphone cable initially but not only was the cable too fat to fir inside the P5's, the treble was too much.
I'll get some photos sorted out to show you all when I figure out how to do it ;-)
Anyhoo...that's about it.
I just wanted to share the joy since I'd been looking for a thread like this to 'show me the way' with my P5's. I hope that this will allow all you other P5 owners to get the most from your investment!