Originally Posted by H3||scr3am
the AD900s are the big brothers to the AD700s, I personally own and love the AD700s, but would probably find the AD900s just as good, and I would recommend an amp, but its not neccesary... something like a PIMETA or Mini^3
I wouldn't recommend an amp for these headphones. There will be an increase in quality, but very little.
If you want an upgrade, sell off your headphones, get some sennheisers (closest best in that price range) and buy an amp (Little Dot MK).
I own the A900s (not the AD900s) - which are basically the same, except the open headphones (AD) have a larger soundstage. Stick with your AD-700s if you want to save money, there is no big difference between the 700s and the 900s.