SVS SB-1000 subwoofer (https://www.svsound.com/products/sb-1000) is 12" and very musical. Produces down to 24 Hz, with power of 300W RMS. Suitable for music and movies (less so for movies as primary use, as sealed box subwoofer is less impactful as ported ones). Local set bought from KEC in Sep 2016, with warranty, black ash colour. Selling because my new speakers go low enough for my music needs. Working 100% and comes with box. Comes with SVS SoundPath foot, for additional isolation so that the sub can go lower in frequency, and does not rattle on your floor or cabinet. Contact me if you are interested, low-ballers will be ignored. Test when dealing; no returns/refunds.
Choa Chu Kang, at my HDB block because too heavy to lug to MRT.