PSW10 connection to powered sub output

Is there a way to connect the PSW10 to a line that is already amplified? During renos I found myself looking for a spot for my beloved Polk speaker system. The only system I can use them on now is a lightly powered all in one LG blue ray & surround sound combination unit. The unit has a powered output to a small subwoofer. I have tried to connect this unit splicing a "y" connector running into the rca's. Everything works great for a minute or two then both the psw and the amp will shut down.

I have tried the turning the low pass all the way up with no luck.

If anyone has any ideas I would welcome them.

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