This is a lot of very good information and discussion. Thanks a lot for sharing your thoughts!
A little change of events last night: Someone posted a SVS 25-31 PC Plus Sub locally and I got it for $200!! It was like new condition.
Built-in amplifier: 525 W
Inputs: low-level dual RCA + high-level stereo (filtering the main speakers' signal)
Frequency range: 20-100 Hz, +/- 3 dB
Low roll-off point: 25 Hz, adjustable to 20 or 16 Hz.
Dimensions: cylinder 79 cm tall, 41 cm diameter
Finish: black fabric
Supplied accessories: power cable, two foam port blocking plugs
Blocked 2 ports (supposedly brings it down to 16Hz) since I don't typically go very loud. Hooked it up and with my RF7 system and Pioneer 1522K,
Played Inception when the van jumps off the bridge. DTS Master Audio + THX mode : The feel of the avalanche was INCREDIBLE! Never felt anything like that with a pair of Klipsch RW12Ds.
Got suggestions for me to improve the overall experience please?
Goes to show how much better the SVS (or concluding from discussions here, HSU or PSA) are. Personally I like the cylinder design. I will probably go for PC12 Plus or a VTF 15H in a few months, but for now I can keep calm.
Again thanks in advance for any recommendations or suggestions!