Originally Posted by markg35
Another option is Stereo Intergrity HT 18 v2 and DIY Soundgroup flatpack powered with an Inuke.
Second the above. If Hz/$ is your main concern, I'd lean towards the HT-18 with iNuke amplification. The iNuke DSP would cover your step 2 as well.
Not to push you away from a flat pack, but if you have more time than money on your hands, you could probably buy the simple woodworking tools needed to build a box which would far outperform a 4ft³ flatpack from a sonic perspective (likely not from an aesthetic perspective) and come out about even in total cost. Lets look at a full Marty just to take it to the extreme:
-2 sheets MDF from Home Cheapo=$60 (used for bracing as well)
-Cheap jigsaw from Home Cheapo=$40 (not needed if you convince the Home Cheapo to cut for you)
-48" drywall square to measure, square and line up cuts from Home Cheapo=$11
-Extra glue for larger box from Home Cheapo=$6
-Safety glasses from, you guessed it, Home Cheapo=$5
-Clamps would be required for both flatpack and Marty, omit (although if truly pressed you could probably put the flatpack together without them)
-Finishing costs would increase with box size but not much, omit
-Driver, wiring, SpeakON, Speakon chassis mount would all be needed in either case, omit
-Technical support from bassheads on forum, priceless
If you would rather have a premade solution (albeit a small sealed rather than large ported) we all understand but will still try to push you towards putting a subwoofer in a shed nonetheless
. Either the Parts Express or DIYSG 4ft³ sealed boxes will likely still impress you from an upgrade perspective and will probably have a higher WAF assuming your woodworking skills are limited.