Radial Mix 2:1 2-channel Passive Mixer

Will this work with powered condenser mic's? thank you

Will this amplify a signal or only attenuate ?

will this allow phantom power through to the condenser mikes from a focusrite solo?

Can i input 2 stereo to 1 mono out? the main out from my dj mixer is 2 stereo xlrs but my next gig only allows djs 1 xlr input to their sound system.