Small footprint subwoofer

I’d add the SVS SB1000 Pro to your list as it’s small but still has a 12” driver and goes down to an honest 20Hz (-3dB), and you can get two for less than the price of one of the REL or KEF subs mentioned — I’d definitely get two as it’s always significantly better than one, and you get a $50 discount for buying two. In addition it comes with a helpful app that makes integration much easier, and they offer a risk free, 45 day in-home trial including shipping both ways, so why not??? Read the reviews that are consistently very positive. And BTW, the only way these would overwhelm your room would be if they’re not properly set up (i.e. volume/crossover set too high), which again is made much easier with their excellent app. Just another option to consider, and best of luck.

I have dual REL T5/x subs that I really like but, on paper at least, they likely don’t compare to the Kef.  I went with the RELs due to cost as I wanted dual subs and the Kef is about twice the cost of the REL.

Thanks for the recommendations. The KEF is nice but it is out of my range. 

@soix The SVS SB-1000pro was a consideration a while back but still think would be too big for my room especially going two subs. I get the performance aspect of it but I really don't need anything lower 30hz since this is just a 2 ch music only system.

B&W ASW608, fantastic sub. I’m using two and completely satisfied. The subs include some basic DSP options to help with integration.

Cheers,

Scott

https://www.bowerswilkins.com/en-us/product/subwoofers/asw-series/asw608/150058.html

If the Kef is more than you want to spend two REL T5/x are about the cost of one Kef. Two SVS 3000 micros are slightly more than the two RELs. The SVS at 23Hz goes deeper than the REL at 32Hz but my in room response is a good bit lower than the 32Hz spec.