The idea of passive is to not color the sound? Get something like a creek OBH-12 which is as passive you get and see what your amp and speakers really sound like.
Do all Passive preamps exhibit this trait
I have a Adcom GFP-750 passive/active preamp which sounds somewhat recessed in the treble region when used in passive mode. It's active mode sounds harsh and fatiguing in the treble but there's certainly more detail and extension. I'm wondering if these traits are symtomatic to varying degrees with all passive preamps compared to active preamps. I love the GFP-750 in passive mode but sometimes I do wish for more extension in the treble region. Does anyone know of a passive preamp that will provide me with this treble extension and at the same time sounds relaxed with no listener fatigue. Thanks.