Unless you go with a real high end studio sound card, it will be no more than 2.2 volts rms.
I think it is a unanswered question...
What is the RMS voltage of the preouts of an Audigy sound card ???
Opus case. MB 899 core duo 2.0ghz
Dual vga out, 400 gb hard drive, Centrefuse front end
zapco 1000.4 for zapco 6.5 componets
zapco 1100.1 for 2 13" W6.