I have a Rega RP1 turntable connected to a Rega Elex-R amplifier, and I want know if I can connect my Sennheiser Momentum 2.0 over-ear headphones directly into the amplifier without buying a headphone-amp. Is that possible? I have the AudioQuest DragonFly Red portable DAC that I use frequently with my smartphone, but not sure it that is sufficient or even feasible with my hifi-system? My initial thought was to connect my 3.5mm headphone cable into a female 3.5mm/RCA adapter, and connect the RCA-end into one of the amplifier’s outputs - would that work? Appreciate any advice or helpful information.