Most likely the PSA and RA sub will not fit the bill as a single sub. DIY is a great recommendation. If this is the final piece for the HT setup, don't undersize the wooferage. A Danley sub is a consideration or a couple of large Marty cubes.
Klipsch RF 7 based HT 7.4, Pioneer SC 35, Acurus 200 Five, Dayton 18 Ultimxa Dual Sub Cab(2), Dayton 18 Ultimax Large Vented Sub Cab (2), on Berhinger I Nuke DPS amps, Samsung BDP F 7500, Asus/My Book Live HPC 4 TB
Yaquin VK 2100 amp, McIntosh XR 5 speakers, Samsung BDP F 7500