From preamp to same amp

[Varmit]

Hi!
I have a Hertz HCP 4D amp, a 4 channel amp that can also be set to 3 and 2 channel mode.
This amp will drive my new component speakers, and a subwoofer. So 2 channels for speakers and 2 bridged for subwoofer, 3 channel mode.
I want a remote control for my subwoofer.

My player has only front RCA output.
My question is, do you think I could connect this pictured RCA volume knob on the PRE-out of my amp, and then back into "rear in"?
Would this work with my setup?

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