On 2011-06-30 07:53 +0930, Matthew Smith wrote: > But what about the system output - should that be +/- 5V? Why not ? That's +13 dBu. A lot of semi-pro gear can take +22 dBu or more. You could also add an output attenuator (AKA volume knob). http://designtools.analog.com/dt/dbconvert/dbconvert.html -- André Majorel http://www.teaser.fr/~amajorel/