Ok! I am in a bit of dilemma I want to upgrade to a new sub- right now I'm using an M&K V-75 mkII running of the LFE and a REL Q200e connected via Neutrik cable. the REL is relatively new purchase and I'm really happy with the sound it produces in stereo when my AV amp (yamaha RX V2700) is in Pure Direct mode. With movies I've been enjoying the M&K for about 10 years now it's still working perfectly and hammering out the bass lines but I feel could use some more SPL and true Depth. After what I've heard recently I'm really really tempted to upgrade to a Monolith DF but a little reluctant to let go of the M&K, I know it's a bit old but I've had it since new and it's still a great sub, What I'd like to know is anyone's experience of the Monolith, If it truly does go deep? and If they've had any experience of the M&K V-75 or similar compared to the Mono' DF. help me I'm really confused!