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Thanks Mad. Your explanation is kind of what I am experiencing. I have a wooden floor (well 2 floors as I actually raised the floor level completely by around 2.5ft so the new floorboards are supported on top of the existing wooden floor). I have had a REL Strata 5 for a good few years which is down facing 10". I loved the feel of the floor at very low frequencies.
The REL has a bit of a problem at present so I'm just running in a Monitor Audio GSW12 which having only had a very short time is showing potential but I guess I was expecting the REL feel but to a greater extent.
My plans are to run both together through the LF link through of the Monitor Audio sub but as the REL is presently unwell, I haven't had a chance to. As a stop gap for testing, I've tried a Mordaunt Short Genie sub as the "second" sub and even with no setups it sounded pretty good.
The only reservation I have is using 2 subs of differing size drivers (12" to 10"), differing frequency responses, and differing orientations (forward/down).