You will not be disappointed with GSG, great folks to deal with, before, during, and after the sale. Just a thought. Look at the price of two vs four. Then add in shipping (close to same price for two vs four). You’ll realize the price of the extra two is ridiculously cheap.
I bought four intending to then list two for sale and let them sell whenever they sold. Then, after two were built and working I wondered, how much better would two more sound? So, I built the other two (and they all sound great together and really evened out my bass-sucking freak room).
Asarose is absolutely right, marty’s are an easy build from scratch. The issue for me is that I love putting stuff together but hate cutting mdf. My from-scratch builds require frustrating re-cutting, material removal, gap filling, and endless bracing sizing and resizing. GSG is all the fun parts of building a sub with none of the frustration! It fits to the millimeter the first time, every time.
SPEAKERS: 3 x DIYSG 1099's LCR; DIYSG HTM 6's and 8's surround; 4 x RSL C34E's atmos.
SUBS: 4 x UM18-22 Mini Marty's (and always building, currently working on Devastators).
SIGNAL CHAIN: Denon X4400; Minidsp 2x4 HD; 2 x Jensen Iso Sub 2RX; 2 x NX6000d.