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He has a line level center channel output on his old receiver -- best to use that.
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But wouldn't the center channel only carry center channel steered bass? I would think you'd want the mains information....
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Better to put at least a 1K ohm resistor in series for each leg of the splitter before combining -- so isolation is maintained.
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Well, he indicated he was feeding a stereo amplifier for the sub, so I assumed a stereo input capability (that he would be bridging), which would be fine.
I don't think the 1K ohm mixer resistors would result in an acceptable crosstalk. They would result in an input impedance of 1K ohms and an output impedance of 500 ohms. Lets assume his preamp has an output impedance of 100 ohms (reasonable assumption). The mixer divider setup would result in ~-26dB crosstalk between channels. Not really acceptable seperation.
If you scaled the resistors to 10K ohms, then the crosstalk would drop to ~46dB (assuming 100 ohm o/p Z). Quite acceptable. The resulting higher input impedance to the mixer that would normally be a problem with line driving capabilities and the unfavourable low pass distortion that results, would be fine since he's feeding a sub. You could also mount the arrangement near the sub.
But I don't think he really needs a mixer, since it sounds like he's driving stereo....
brucek