Hi. I just sold my 2 subwoofers since I don't have the room in my new house for them and my new speakers don't need them. I still have a pair of bookshelf speakers for sale that I want to demo with a sub. My preamp doesn't have a sub out. I have Schiit Vidar 2 monoblocks. The sub was very inexpensive, but it does have high level inputs. Can I run 1 + - from each monoblock to the LR inputs on the sub? Any input would be appreciated.