Mr. Penngotti,

You and I are kindred spirits. I also like the music loud with a good thump from the kick drum. The good news is that it is doable. The bad news is that it is not quite as simple as just adding a subwoofer, though that is a good start.

In my opinion you do not need to buy expensive subs. I like the SVS SB4000. I also like Rythmik, but they don’t do loud as well as the SVS.

Regardless of what brand you end up liking, multiple subs will help minimize a lot of the room acoustic issues you could run into when you introduce powerful low end into your system.

Liking it loud with a strong low end will more than likely cause you to push your system too it’s limits so I would also be looking at subs (as well as all of your gear) that have actual balanced inputs. If you really want to achieve arena levels, you will need every bit of gain you can find and having a balanced system really helps with that.

Down the road I would look into some type speaker management system to limit the band width that your Snappers need to reproduce so they don’t get eaten alive trying to drive those Harbeths full range.

You can pm me if you have questions.

Installing subwoofers requires an even frequency response with limited decay to get tight bass. Multiple subs and feature sets included is subs are other tools to make this happen. With my limited experience I would suggest a larger subwoofer like the s812 or larger. I had an S510 with 15" main speaker woofers. While it was fine, it did not match the 'presence' and output of my speakers as well as my larger subs. 

@jl1ny

Sorry to interrupt but I am curious in what way is the S510 better than the T9. Room setup was the same for both models?

I agree that dynamic kick drum thump is doable without a sub (kick drums don’t go that low).

I was able to achieve this without subs by fixing the room and repositioning the rack on the side wall...nothing between the speakers but carpet. I also had a fantastic room at the time.

It’s not just the bass that hits hard, everything else comes into focus as well. I was able to achieve this with Salk Songtowers with 5" woofers. I no longer needed or wanted a sub. Funny thing is that I was not looking to improve bass...just trying to see what moving speakers to the other side of the room would do to imaging/clarity.

I would add the sub after you figure out optimum placement and room dynamics. I did it without software but it was a lot of trial and error over the span of a year.

The Tannoy 10" woofers in my current room could not touch the bass of the Songtowers 5" woofers in the old room.