I looked at the descriptions and specs of the two units, and I don't see any problem doing that.
As always, you would want to turn the amplifier that is driving the speakers (the Luxman) on last and off first, so that it can't amplify turn-on or turn-off transients that may be generated earlier in the signal path.
Impedance compatibility looks ok, in terms of sonics. (An impedance incompatibility would not cause damage, in any event).
If the Exposure's amplifier section had a tube output stage and output transformers, you would not want to operate it without a speaker or equivalent resistive load connected, but it is solid state so that is no problem.
A point to be aware of, though: Although the signal path through the preamp section of the Exposure to its own amplifier section is passive, its pre-outs are driven by an integrated circuit chip, probably an "op amp" (operational amplifier), which provides a low output impedance and approximately 18 db of gain. So you are not truly using a passive preamp in the configuration you describe.
Regards,
-- Al
As always, you would want to turn the amplifier that is driving the speakers (the Luxman) on last and off first, so that it can't amplify turn-on or turn-off transients that may be generated earlier in the signal path.
Impedance compatibility looks ok, in terms of sonics. (An impedance incompatibility would not cause damage, in any event).
If the Exposure's amplifier section had a tube output stage and output transformers, you would not want to operate it without a speaker or equivalent resistive load connected, but it is solid state so that is no problem.
A point to be aware of, though: Although the signal path through the preamp section of the Exposure to its own amplifier section is passive, its pre-outs are driven by an integrated circuit chip, probably an "op amp" (operational amplifier), which provides a low output impedance and approximately 18 db of gain. So you are not truly using a passive preamp in the configuration you describe.
Regards,
-- Al