I did the same and the customer service rep said Philips sells headphones but HAS NO ACCESS TO PARTS. Wha? Yep, true story. They then directed me to Amazon and Encompass Parts which were dead end (these being searched by the customer service rep while I'm waiting on the phone and searching same sites as well, bless her heart). So end of story as far as I can tell is that there's essentially no support/parts for these unless you warranty your set thru Philips. The rep also checked the Group On site and commented on how the pictures were inaccurate to the package contents listed in the specs.
I've seen some DIY threads with respect to these headphones but haven't had a chance to check them out. I also cannot find a single frequency response graph that's not based on some mod.
IMO, these sound great but you're on your own moving forward. Anyone got any impressions of these in comparison to the Audio Technica MSR7?
Bottomline is I really am enjoying their sound but not sure why they got no love? Did Philips piss off the audiophile gods? The thread doesn't have much feedback in terms of quality issues so I'm not sure where these fell flat other than maybe the starting price point. The build of these headphones is VERY thorough and robust. If I we're a DJ and needed something I can beat up and sounded great, this fits the bill.