I currently have 2 FTW-21 in 7cf cabs w/2 ep4000s flanking the front + 2 Outlaw LFM1-EXs nearfield right behind me. This is all in the concrete basement 2000cf room.
Output is not an issue.
But, my Outlaws do exhibit audible port noise on a very select set of movie scenes...it's literally probably .01% of the time. Maybe even less...BUT, it does annoy me when it happens. I've tried sealed nearfield (have placed one of my FTW-21s right behind the LP), and it just doesn't shake my couch like ported subs do. I'm convinced in my room, that ported does MUCH better job of exciting my HT seating, than sealed. That being said, I don't want to turn this thread to turn into a 'Which shakes more, sealed or ported'. So please, let's just focus on my question.
So, I've been considering swapping my Outlaws with the FV15HP or potentially a passive Cap. I'm heavily leaning toward the FV15HP because of the 14hz tune. My outlaws in max extension mode, get me to around 12-13hz in my room. That's from a 18hz tune, I believe. A 14hz tune may get me to 10hz or less potentially. It's also cheaper solution to the Cap. I believe the Cap has a 20hz tune. I know it has a capable driver, but because of the design and slotted vent (no port plug) the tune can't be changed. However, it can probably dig deep with EQ. I'm just concerned based on it's design, it won't dig as deep or play as loud (without port noise) down low compare to the FV15HP.
My priority is extension, as the lower the extension, the more variation of 'shake' I get at my LP. I've tested my Outlaws in Max extension vs Max output, and the difference in shake and pressurization is HUGE. Max Extension is FAR better from a tactile feeling standpoint and overall ULF effect, but does exhibit audible port noise occasionally...