Y splitter

[toyjoha]

In hooking up a parallel DVC subwoofer, coming from the left & right RCA's on the HU (has only front & back outputs, no subwoofer nor preamps) going to a class D amplifier, that has inputs RCA's for left & right regular or left & right bridge.
The front RCA's on the HU got to a different amplifier to 4 speakers front & back.
So the back RCA's on the HU needs to go to the class D amplifier. Do I
#1 use the y splitter coming out of the HU to a single RCA to either the left or right amp input?
Or
#2 use a double RCA cable coming out of the HU to the y splitter to the left and right RCA amplifier inputs?
Or
#3 use a double RCA cable coming out of the HU to the left and right RCA amplifier inputs? (I am guessing this is wrong since it is not mono)
OR
Something else maybe involving the bridge RCA inputs?

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[1aespinoza 10+ year member]

use a double RCA cable coming out of the HU to the left and right RCA amplifier inputs

Do #3, but to the bridged inputs. Since it has this option, I assume it is a 2 channel amplifier. If yes, make sure it can handle the low resistance of the paralleled subwoofer.