vincent159 0 Report post Posted July 3, 2010 I am going to buy one of them and i heard some saying that hd555 need a amp to work. Is that true? My budget doesnt allow me to buy another amp and i hope this 2 does not need a amp to work. Thanks Share this post Link to post Share on other sites
Stereo_Electronics 0 Report post Posted July 3, 2010 At 50ohms and 112dB, I would consider the HD555 relatively efficient and amping would be optional. Sennheiser HD555 specs Share this post Link to post Share on other sites
vincent159 0 Report post Posted July 4, 2010 How bout the ATH AD700? do it need a amp? Share this post Link to post Share on other sites
Stereo_Electronics 0 Report post Posted July 5, 2010 Optional but you might need to crank the volume knob a little higher. Share this post Link to post Share on other sites
vincent159 0 Report post Posted July 5, 2010 Btw, how much is the hd555 and ath-ad700? i saw the price but forgot the exact price... Share this post Link to post Share on other sites