Quick question from the SVS web site. I am contemplating the 25-31PCi or the 20-39PCi. The website states: "The PB1-ISD has single woofer so as you might expect, it's virtually identical to a 22Hz tuned version of our 25-31PCi subwoofer." Can someone please explain to this newbie how I would get a 22Hz tuned version of the 25-31PCi. Does anyone know how this will compare to the 20-39PCi? Any recommendations - I'm thinking that for the extra $50, I should just go for the 20-39, but not if the 25-31 tuned to 22 is adequate. Here's my set up: Rocket 550s up front and in back along with the 200 Bigfoot, Pio 1014. Room size: 18X16X10 fully opened on one side to a 25X16 kitchen. Thanks.