When I use my DT880 600 Ohm with my Matrix M Stage, I set the gain to 18 dB.
With my FiiO E12, I set the gain to 16 dB.
600 Ohm DT880 need a LOT OF VOLTAGE. So your amp may not have enough gain.
To sum up:
Your amp needs to be able to output enough voltage (6 or 7 or 8 Volts RMS) and needs to have high gain, approx. 16-20 dB.
Thanks Chris J!
I understand the output of the C3 not having enough power...
The MK IV dumps out 45Vpp so that is ~16Vrms plenty or power there.
What I am missing here is if the DT880's will produce 96dB @ 1mW per specs, why do we need 300+ mW amps to drive them properly?
So if 96dB is the sound level of a lawn mower and the volume control on the MKIV is at 10 o'clock which is no where near as loud as a lawnmover. Is the amp putting out less than 1mW at that moment? This is the part I don't quite understand, the power requirements to go from 96dB to 105dB must be huge.
Possibly somthing like the Veyron where 250HP will take it to 100Mph, but it requires 750HP more to take it to 250Mph?