Experience with stacked subwoofers?

@lonemountain 

Standing wave problem is overrated and most rooms don’t have this problem.  Lower bass waves are very long and permeate throughout the room quite well.

Also if you have decent main speakers for two stereo listening you shouldn't really need to have a subwoofer.  Fully endorse subwoofer or two for home theater, you want tanks to rumble your entire house when they move across the screen

I'm with Brsd on this topic as it's settled science going back to work done back in the early half of the last century at Bell Labs. Very common in PA application,  not as common in 2 channel home applications. 

BTW Brad, I picked up some used SAM'S powered by a Benchmark stack.  Very pleased with the results.   I'll stop by the next time I'm in town.

SCM7 

@emergingsoul 

An awful lot of old people still voice “you shouldn’t need subs” and I think this was accurate in the days of Led Zeppelin, early Genesis, English rock and roll.  What I see these bands doing with subs on the recording side has certainly ended that idea. Pop music (Ariana and Sabrina carpenter ) - Americana ( Sarah Jaroscz) even country (post Malone/Jelly Roll/ chris Stapleton, Kane Brown ) -are working the subs hard.
 

Brad

@lonemountain 

I suppose nobody "needs" subs, but damn, they can make an huge improvement when you abandon need and go all out for want, and take the time and effort to dial them in properly.

I spend the afternoon setting up the first four REL S/510 of my six-pack line array....and damn does that sound good...and I still have some fine tweaking to work on.:)

And I am an "old people."