Been sick all week so I made a quick flex vid but it was kinda dark out and my camera sucks so it's hard to see it. Song hits at 23hz and it shakes EVERYTHING. I know I've probably said it a thousand times but I've never had a sub that could dig so low and still sound so good as the xcon
Yes you can just Y the remote. I don't use relays unless I'm hooking up so many things it will create a large current draw. Often a relay will pull more current than a couple devices will. The way I do mine is run a single remote wire to the first amp. Then add a wire from the first amp remote to the second amp. Kinda like a daisy chain. I just think its a little cleaner looking but whatever works.
When you decide to upgrade your amp for your front stage, may want to take a look at this: http://www.sonicelectronix.com/item_29982_VIBE-Audio-LiteBox-Stereo-2-LiteBox2.html They also make it in a 4channel, their super small