I have 600 ohm Beyer DT880's arriving on Wednesday. I saw discussion on head-fi that receivers won't typically drive these well. I use a Marantz 2275 in good enough condition but unrestored to my knowledge. I'm not a member at hifiengine so I can't DL the specsheet and don't have an OM for it. I sorta panicked and ordered a JDSLABS Objective2 by NwAvGuy after many hours of frustrating research. Will my 2275 alone power 600ohm cans well or is a dedicated amp truly necessary with this old 75W receiver?