Agree.....My sub also very powerful.....SPL max can go up to 107dB for a RMS400 watt active sub...
I just adjust less than 1/4....just pointing to THX.......already can feel the deep sound.....
those can hear from where one...might just a normall bass.....
Over power by the sub...for music...not recommended also
But....if for movie.....I also sometimes switch to 1/2 on the volume....already scare my daughter away to find my HM....    
Actually, for me...at the moment....one is enough......just wish to upgrade a floorstand speaker.....
Wonder why your guy eat so much poison until wanna to get another extra sub.....may be I am not reach to the level...keeeeee   cause I just start been poison this early year......     alamak......don't what will happen next few year later for me also...    

I can really "feel" my sub. So, my 10R is already doing a great job for me.

Bro, you buying ah? 

This sub is in diff league compare to CHT-12R. My friend's SPL1200R tapao his very own B&W both 6 series sub. But, his room is nicely done with no vibration and very good acoustic treatment. When you are here, I ll bring you over to test it out. But, no antidote provided 

go check out the star's audiofiles ads...
there's a unit of SPL-1000R going for RM3.6k

I vouch Mega to go for SVS Tube. So, I get the chance to audition it 

Servo 15? Fuyoo... But, those who loves solid punchy bass might not like Servo 15 as it leans toward musicality. It is indeed powerful.

I knew a place to audition this Mama sub. Mega, interested or not? Can audition SPL-1200R and Servo 15    (taruk poison extra kaw)

Ha! Ha! Ha!

I was kiasu then. Got the material then when do the framing, I say as big as possible.
So, it went to 9feet by 5feet.