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Using original Senn over ear Momentums ...ordered the lower gain thinking it a better mating..(once had Senn 600's that needed power)...thoughts?
The medium gain version is perfect for both headphones you mentioned, provided that the output of your source (which inputs the O2) has a max voltage output of at least 1.5v (all Macs and some PC sound cards) or 2.0/2.1v (nearly all DACs and CD Players and the best PC sound cards). For sources of 1v or lower (iPads, iPhones, Android devices, some cheaper PC sound cards), using the higher gain setting you may have to crank up the volume a bit more nearer to the max volume...
...thanks much for your response. As it turns out, the amp came with a switch for BOTH the higher and lower gain. Thanks! I'm extremely pleased with the performance of the amp, while in the process of burning in some Blue Jeans cables, a 2 foot 1/8" male to a pair of male rca's for my tuner and a 5 foot run of 1/8" male to male for my cell phone, using TIDAL streaming service. My wife thanks you also, since the head amp rids the bedroom of more boxes and loudspeakers in the bedroom! :) ) Cheers, Norm