Subs?

Welcome to the dark side. The answer to your question is, it depends on what your goals are, what you listen to and how loud you listen. If you prefer aggressive bass driven music, like blues, rock, EDM, and even modern country, specially at higher volume levels, bigger will be better. Be warned. A good subwoofer system will expose room node issues, which is why more is better than less, up to four.

I would read this before doing anything.

https://www.acousticsciences.com/wp-content/uploads/2024/11/Soundoctor-Barry-Ober-sub-integration.pdf

A great subwoofer system can be immensely rewarding, they can also be immensely frustrating. I have been using subs for decades and much to my chagrin, I’m still learning.

Two subs are always better than one. They extend the soundstage. 

This may be true, but for me it is subordinate to them helping with room modes. Two is good, three is great, four is...marginally better.

Helpful:
https://blog.teufelaudio.com/what-are-room-modes/
https://forum.audiogon.com/discussions/subwoofers-and-phase-question-for-you-sub-experts
 

I added 4 subs and it was the best bang for buck ever.

Swarm, DBA, Audio Kinesis, and James Romeyn…

https://jamesromeyn.com/speakers/subwoofers/general-info-subwoofers/

I made the change about 4 years ago with help from JR Bosclaire (Wally Tools). And when I say help, I mean he did all the work and I held the mic all over the room.

The thing that blows me away to this day, aside from the dynamic sonic improvement, is how little it cost me relative to my system and to mainstream audio products.

I totally get the feeling that four subs is a lot. I debated that as well. I also felt my family would lose their shi$ if I added more “boxes” to our family room (we have an open floor plan). An advantage of a DBA is the subs are asymmetrically placed around the room and the size of Jame’s implementation are not really that big (especially compared to what’s out there commercially). There was definitely resistance at first, but I got lucky. My wife and kids recognized this hobby is a passion of mine and after a while we all sort of just forgot about them. Just remember everything takes time.

Anyhow that’s a little more context for you to think about.

So, one is better than none. Two is better than one. And so on…

I hope you will let us know what you decide and report back.

For dimensional reasons I went with one SVS 3000 Micro (2 at 8") and it really made a difference, notwithstanding the 15" woofers in my K-horns (which only go to 33 Hz).

The second, identical sub really sealed the deal on improved SQ; it also has me wishing I'd been able to accommodate larger subs.