No I don't, but gave the mojo serious consideration when looking for a dac/amp to slot between the AK70 Mkii & HD660S I'd already purchased. As you can guess by my post count, I'm rather new to this game so am prone to ask seemingly daft questions. My adventure started with just wanting a good portable device to store all my cd's on at lossless quality. Sadly the AK70 quickly showed my cheap iem's to be wanting, so I upgraded to Sennheiser 'momemtum' iem's which were a lot better, but once you've heard better you get an itch and It wasn't long before I upspent again, this time to a pair of Sennheiser IE80S iem's, which I really enjoy, but am now playing around with it's cable.
As I was really enjoying the musicality (imo) of the AK one evening after one too many glasses of wine I figured that a pair of OE headphones would make a good addition for home use, I'd always been told that open back were the best and ended up buying a pair of HD660S, literally on a whim with no auditioning beforehand (wine + internet shopping
). Anyway, when plugged into the AK they barely woke and really struggled volume wise with some classical albums in my collection, so like a fool I opted to add a portable amp (FiiO A5) which whist improving drive somewhat also added a level of distortion (double amping?) which I wasn't comfortable with, so after a lot of reading (this forum) my search for a suitable dac/amp began.
One difficult to absorb thread (
This one , post #12) had the post quoted below, which led me to skip the mojo despite it's many positives and aim for a more powerful yet still portable option. The mojo having an output impedance of just 75mOhms shouldn't be enough to drive higher impedance headphones
1/8 rule they usually go by. so say nominal impedance of a headphone is 600ohms nominal, so the ideal output impedance should be 75ohms or less. like for example, speaker amps always went by atleast the 1/8 rule. that's why well built amps had no resistance at the speaker outs(0hm output impedance) which makes them perfect voltage sources for reactive loads like speakers.