Subwoofers - crazy upgrade!

@ozzy 

Your subs are heavyweights! By the looks of them, they have 4 rubberized feet that may help stabilize them, along with the weight of them if stacked but I would be concerned about putting that kind of weight on top of another speaker/sub. The specs say the cabinets are made of 3/4 inch thick material but still 135 lbs. is a lot…I see the F-113v2’s are 2 woofers in one cabinet similar to the REL S/212’s (which weigh 134 lbs) neither is stackable. I get to play with a pair at the end of this month.

To be perfectly honest about it I was happy with a pair of REL S/812’s…And lost my mind that took me where I am today…still figuring it out!

Enjoy the music!

Gary

>> "If you stack subs, doesn’t that introduce vibration into each sub, causing distortions?"

Well.... even if it mattered, a good sub ought to be pretty inert.  It's the cheap ones that vibrate.  If you're going to stack two cheap vibrating subs then what's the point, should have just gotten one nicer one.  

>> "I am not aware of any literature on stacking subwoofers versus dispersing them but I agree with your understanding of the latter's advantage."

The famous Floyd Toole literally wrote tons of whitepapers on this subject.  

Regarding the comments about stack vs spread out, yeah it's better to spread out.  It doesn't just fill in the nulls, it also makes response more even from seat to seat which is very important in home theater, and it also provides active cancellation, which is grossly overlooked.  Most people in typical rooms have an obnoxious spike around 35-40 hz, often another not so big one around 55 hz maybe.  So what do we do about this, stack the subs and make it even more obnoxious?  LOL.  No.  Spreading them out provides active cancellation that brings that spike down.  The alternative to this is a whole bunch of bass traps.  

Usually the best thing to do in terms of even response is to put them in the middle of each wall midpoint.  However that's usually not very feasible.  Second best, which also provides gain from the corners, is to put one in each corner, which is most popular.  Another method is to put them on the 25% points of the long wall if your room is long.  

As mentioned above, Harman has a ton of whitepapers on the subject, often written by Floyd Toole.  

I’m using a 12 inch SVS sub.  Should I add my old 10 inch  Martin Logan’s?