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need something to switch back and forth between powered and unpowered monitors, as well as help with headphone amplification (i've got an RME fireface and this headphone amp is never going to facilitate a further decline in my hearing - i need something louder)

i don't have a mixer so i do need to be able to bring in and switch an additional music source, such as for listening to cds

i do have active and passive monitors

not sure if i trust samson quality - don't care much about longevity, i'll treat it well - but do care about sound quality; comparable specs are hard to come by

i think i'd get the mackie big knob if it were rackmountable - it looks like it'd make a mess of my audio desk

so i'm leaning toward presonus central station

any thoughts? anything else I should look at? should i just get a mixer and use my old speaker switcher?