Oh yes, I also have a SubPac, which made me fall in love with tactile transducers aka. bass shakers.
I ended up attaching bass shakers to my chair too. Custom setup with two Reckhorn BS-200i, a cheap TDA7498E amplifier from AliExpress (more than powerful enough, and sound quality doesn't really matter), and EqualizerAPO for the software part. It cost me around $200 and a few hours for the full setup.