Glad you're enjoying the sub with your M6's. I just took the plunge on an SW1600 with my DSP3100s and have experienced a huge step up in pure musical enjoyment from room filling presence to greater minor details and top end as my satelites have been freed from the bass burden. & that's just music... Movies are awesome!

Main: MS600, G61R, DSP3100Vx3, DSP33x2, SW1600, Samsung 65JS9500 TV, Sony X800, Wireworld Star*light video cabling, Isotek Vision, Isotek Elite/Prem mains cabling.
Office: Roon ROCK on NUC7i5, Allo USBridge + iFi PSU, Prime Amp/PSU, Fostex TH900.
On the Go: Surface Pro, Explorer2, Sennheiser Momentum M2
Smyth Realiser2 on pre-order :-)