I am fairly new to the world of headphones. I have just ordered the Sennheiser HD 579 which are a 50 ohm, open back model and I probably won't play these too loud. I have a rebuilt Kenwood vintage separate amp/preamp now, each with headphone jacks. I know this will probably be a difficult question to answer, but is there an advantage to buying a separate headphone amp for these cans? I am looking at the Schiit Magni 3 as in my budget range, but I obviously don't want to buy it if the Kenwood 700 headphone amp will be just as good. Having such little experience with headphones I probably wont ever be certain if I am hearing the HD 579's at their best without understanding just what a separate headphone amp can do for me.