You should be able to get audible port noise if pushing loud enough.
Anyway here is one long time member at AVSF who owns 9 different subs. Few comments:
I have a pair of both the Monolith THX Select 10 and PB-1000. Both are good subs in small/medium sized rooms, but the Monolith is the better overall sub in both build quality and performance. The Monolith 10 is most comparable to the PB12-NSD from my experience.
I have both the Monolith 10 and SVS PB-1000 and they are terrific subs. Neither is going to fill a large room, nor will they really have the impact of larger subs. I got the PB-1000 for around $360 open-box/like new and for that price it's a great little sub. I do think the Monolith 10 is better, with what I call the "signature" Monolith sound. The Monolith subs just play incredibly clean and have a little different sound than most other ported subs.
Then there is other member who did comparison of these two:
Monolith seemed to have a smoother sound and definitely had less cabinet resonance. During the scenes with the flying cars there are lots of great low sweeps and rumbles that really give the subs a workout. With things cranked up the SVS got a little bit of port chuffing, which I got none of from the Monolith. Also, the PB-1000 had definite cabinet resonance that stood out, where the Monolith was nicely damped and uncolored. When Wallace's forces attack the hotel, and later when K chases down the cars carrying Deckard, both of the subs shook the room nicely and pressurized just a tiny bit, but the Monolith seemed tighter, less boxy sounding, and more composed.
Neither kick you in the chest during gunshots or other loud fast transients but they both have a satisfying thump to them that bumps the walls.
Longer story here with pictures (typo in the headline)
Monoprice Monolith 10 THX vs SVS PB-1000 Subjective Comparison I have been building a new theater room and trying to pick a sub. I can only afford one sub in the $500 realm right and it's been a challenge to decide. My room is ~2600 ft^3, carpet and drywall, square-ish. I have been using an SVS...
www.avsforum.com
@BoutTime keep in mind the Mono 10 price should be ~425£ - SVS 450£. Week ago i said one member to ask it via email and he got the -15% discount code so it should be possible.