How does adding a second subwoofer improve your systems SQ?

Sunshine in Sydney, our water out of the tap is one of the best anywhere, very drinkable and better than nearly all bottled water, better than the stuff you have coming out your tap.  

Thanks ggc. I just ordered my second sub. Actually, thanks too all

Might I ask what second sub you have ordered? And is it the same as the first one?

Thanks!

And is it the same as the first one?

That would be the way to go, you wouldn’t have different left and right main speakers.

And don’t run them of the "sub output" if using a HT amp, set the programing to "no sub" and set your left and right mains to large and get the signal for your subs from left and right main pre-outputs

Or if using a normal stereo pre amp use these on it’s L & R outputs to supply both your poweramp and your subs
https://www.ebay.com/itm/Valab-Gold-Plated-RCA-Y-Splitter-Adapter-1-Male-to-2-Female-RCA-Adapter-1pcs/283760200309?hash=item42116d0a75:g:RXwAAOSwGBhaYNGt

Cheers George

Since bass trap advocate Erik Squires is playing the "cultist" card to discredit multi-sub advocates

@audiokinesis

I’m not discrediting multi subs. I’m discrediting the cultish behavior on the proponents on Audiogon. As I’ve written, it is characterized by:

1 - Refusal to accept other solutions are possible or more applicable to specific questions by posters.

2 - Insistence on the swarm being a solution to everything a poster asks about, regardless of application. "Help I have noise on my left channel." 30 seconds later ... "You need a swarm!"

3 - Lying about what other prominent professionals have stated.

I have no particular interest in whether some one finds the swarm a useful solution in their environment. It’s the cult-like behaviors above I find distasteful, and that you seem to be happy to misstate my position despite how clear it is. I also don’t care if you promote it as a possible solution to the general problem of finding good bass in a system.

I do care people I interact with do so in a respectful and sincere manner, and this has definitely not been consistently the case around this issue and as a result I have grown a profound distaste for those who promote it. I don’t think that’s unfair.  Your sentence, quoted above, reaffirms my choices.

I do care people I interact with do so in a respectful and sincere manner, and this has definitely not been consistently the case around this issue and as a result I have grown a profound distaste for those who promote it.

What's that?  Cake and eat it too?  

I use a "swarm".  I guess that's what it is, I have 4 subwoofers.  I encourage people to give it a try.  Is that "promoting" it?  I guess it is.  Why would you have "profound distaste" for me doing that?

I don't have bass traps (I do have some acoustic panels however).  I also don't tell people that my way is the "only" or "best" way nor would I or have I told someone that using bass traps can't be effective. 

My friend has the best system for bass I've heard, hands down.  Two subs.  Bass traps. Diffusers.  No swarm.  It's awesome!  To me.  Someone else might think it's too much bass.  Or not integrated enough. Or whatever.  He loves it.  I think it sounds amazing.  Someone else might have a different impression.

One of the great things about this hobby is that for many aspects of it there are a multitude of ways to achieve the outcome that is "best" for the individual hobbyist. 

"Best" being subjective because everyone has different tastes, spaces, and budgets to name a few common variables.