Originally Posted by The Monkey
Ok, Gang, bear with me. I just balanced my Senn HD 650 stock cable. I'm running it from the XLR outs on the DAC1. I have it on the variable setting so that I can use the attenuator on the front of the DAC1. The problem is that I need to go anywhere from Noon - 5:00 PM to get suitable volumes (so the steps are not very efficient). Is this due to the high impedance of the XLR output (am I stating that correctly)? And if so, what should I do to improve the situation?
Hey Monkey... remember that the DAC1 USB is delivered out of the box with the internal jumper pads set to a -20Db reduction on the balanced outputs (I think it affects the RCA outputs too). The jumpers can be set at either -30, -20, -10 or 0. I believe I recall reading Iron_Dreamer and others advise that the jumpers need to be set back to the zero damping level, which makes sense given how high the current needs to be in order to drive headphones, which are low-impedance devices as compared to multi-thousand ohm speakers, directly from a high impedance output (I think I've got that right?). I think the headphone jack also has a separate gain-reducing jumper similarly set to a lower level out of the box, but I'm pretty sure it's controlled by a different set of jumpers so don't feel obliged to change those unless you want to get even more volume out of the 1/4" jacks too. Mine is freaking loud out of the box so I doubt I need to do that.
I am prepping to do exactly what you are as soon as the new stock HD 650 cable I ordered arrives so I can slice it open and wire it for balanced configuration. So I'm very curious to hear how it works out for you!