Audio Technica ATH-m50x DJ Headphones for Studio
The Beats Pro is the loudest "great" without headphones headphone amplifier I've ever heard in my iPad4.
More than 80% of the Max volume can not be heard without pain actually.
Unfortunately, the pressure was too high for me, what was particularly bad because my ears (75 mm long / high) did not fit into the ear pad openings.
With a heavy heart I sent it back, just like the Audio Technica, I even found even better from the price / performance ratio and make me now to look for a 32Ohm headphones for my iPhone / iPad.
(The Audio Technica played at 100% volume on the iPad 4 ca just as loud as the Beats Pro at 80%. Often I was the Audio Technica is too low at 100% volume! This only marginally if other buyers have the same problem!)
The Vearbeitung of beats per second to none.
Almost anything "too good / stable" because it is too heavy for me.