40?

that scares me unless you are using it to drive speakers. even then its a bit much

default gain is 10

I would go between  6 or 8.  This works well for my lower impedance Sony headphones all the way to Hifiman HEK.

9 minutes ago, kevin gilmore said:

40?

that scares me unless you are using it to drive speakers. even then its a bit much

default gain is 10

I thought that seemed odd. As tempting as this is I have emailed @spritzer to see if he has anything suitable at the moment. I live a long way from a post office, which is a long way from anywhere else, so life gets expensive when things go boom...

On August 3, 2016 at 1:23 PM, kevin gilmore said:

40?

that scares me unless you are using it to drive speakers. even then its a bit much

default gain is 10

Yep, usual gain for SPEAKER amps is around 10-20 (20-26 dB).  Headphones generally need less, which is why in the bad old days the headphone jacks on integrated amps and receivers often had a resistor in series to cut down the gain, and possibly also to prevent the amp from blowing out the headphones.