gochurchgo OPNo not dumb, it’s said Odyssey’s are hi gain (low input sensitivity) this means they are the ideal candidate for a preamp with no gain, like a passive.
so would it be a dumb question to ask if a passive would work given Odyssey’s low impedance?
But! the problem is they are only 25kohm input impedance which is not great for a passive preamp, you need at least 33kohm or higher for a 10kohm passive to be impedance happy.
So what you need is a passive preamp with an active "unity gain" buffer, the closest I can think of commercially with trial period is the Schiit Freya preamp. at $699. designed and made by Mike Moffat of Theta fame.
It’s 3 preamps in one with a very good 128-step relay volume control, remote control, xlr and rca inputs and outputs,
Mode 1 passive with no gain
Mode 2 Active discrete fet buffer, gain of 1 ( your most likely one)
Mode 3 Active tube with gain of 5
And you can return it if no satisfied.
http://www.schiit.com/products/freya
"Mode 2" could very well be a copy of the Nelson Pass B1 buffer, as it’s also just a couple of fets and simple like this, but it "looks" as if Mike Moffat has gone a step better and dc coupled it, which is better, as I can see what looks to be dc servos around those fets with no coupling caps.
Cheers George