Subwoofer & pre amp


I like JL Audio subwoofer, had F113 for a brief period and thought it was better than Rel B1 & Stadium I used to own.

I now have a pre amp with only 1 set of output; JL only takes line leve input and no speaker level input. Short of using a Y-adaptor which will degrade sound more or less, will I be better off getting a Velodyne DD or Rel again? Either one will be physically larger than JL whcih could be an issue.

This sub will be 30% music & 70% HT, I normally don't use sub for music but like to have that option.
semi
it does, but only 1 channel. it's for connecting more than 1 sub using daisy-chain method.

even if it has stereo out, it will degrade system sound. my emphasis is on maximizing 2-ch performance, otherwise I can't justify spending the kind of money I spent on pre & power amps.

if all fails, I might even down grade to a cheap sub just for HT...
Semi- my advice would be to NOT use a Y cable of any kind. Many 2 channel preamps will exhibit crosstalk when the output is put into this sort of condition. Even tho the F113 is a very good sub, my advice would be to sell it and go back to REL. BTW - what pre-amp are you using that has only one set of outputs? Most modern pre-amps that I have seen, heard, used have at least 2.
I am using Einstein pre amp. simply the best I have owned, but it lacks many useful feature like HT bypass, 2 sets of output, or even volume setting. German likes to do things differently, form follows function at its best.

guess it's either Velodyne or REL for me?
Why dont you manufacture some resistors that goes from speaker output of amp and then to low level input on JL?
like a voltage divider or a variable pod? I will need high current resistors since it's coming from speaker terminal I assumed.

interesting suggestion, let me research into that.