How does adding a second subwoofer improve your systems SQ?

markj941 OP

If members here that are pro one sub, and running it off a HT sub output.
Forget that single HT preamp sub output, get two subs run both subs from the main L & R preamp outputs 
You will find if you have two subs and in the HT programming "set the mains for large" with "no sub" picked, then cross the 2 subs in at where your mains fall off, get the phasing and level right ect.
Your in for a treat from what can come from active proper stereo setup bass bins.
Your mid sized floor standers or large book shelves will have the scale of sound that you only get from big floor standers like Wilson Alexia Max Alex ect.

Cheers George  

@erik_squires , you already posted a link to your blog page where you wrote: " I am no longer a fan of this idea [distributed bass array/muliple subs] due to the fan boys and how cultish they have become. "

And now you post: "... I often challenge the DBA cultists..."

This is starting to look like trolling, Erik. 

Maybe you can advocate for your preferred solution without name-calling? 

Duke

Duke,
You already know where we stand.  I won't be editorialized by you.
Erik

" I won't be editorialized by you." 

I suppose we're both free to call it like we see it. 

Duke

So some of you may be wondering which actually makes the biggest improvement, adding bass traps or adding more subs. Since bass trap advocate Erik Squires is playing the "cultist" card to discredit multi-sub advocates, I’m gonna play one of my cards. It’s an "acoustician" card.

Matt Poes of Poes Acoustics, who doesn’t sell subs but who gets paid to install bass traps, briefly compares his experiences with bass traps vs multiple subs, as far as effectiveness below 80 Hz.

Takes thirty-two seconds to listen to. From 37:37 to 38:09. Click on the link, suffer through the inevitable ad, and it’s already cued up:

https://youtu.be/shHY7EHY4MA?t=2257

I have zero affiliation with Matt.

Duke
distributed multi-sub system manufacturer since 2006 (so take me with as many grains of salt as you need to)