Can someone double check my approximate calculations to see if the C421 would drive the DT 880 600 ohm version?
C421: 28 mw at 600 ohms (Based on C5 measurements, I believe they have the same output)
O2: 77mw at 600 ohms
Magni: 130 mw at 600 ohms
You will need 1mw to drive the DT 880 600 ohm to 96 db. (10 * the sound pressure of listening level, 85 db)
Average listening level should be 80 - 85 db in order to prevent long term damage to the ears.
All of them will push the DT 880 600 ohms to over 110 db, and your ears will bleed. Around 20 mw needed to reach 109 db, so the C421 will drive the DT 880s?