If I am picturing this correctly ssabripo, why not have the seams face at like a 45 between the side wall and front wall on the south sub? That way, the only time you would really be able to see them is if approaching the space between the two subs in that front left corner. All other area facing into the room would be solid material.
Mike, displacement is 6.52 liters per driver peak to peak. Simply put, two of these ported towers will be able to put a *LOT of energy into the room. I'll be interested in hearing his own opinion of the bass, as the Avalanche 18 has a certain clean quality about it. The bass doesn't sound heavy or muffled, and it doesn't all sound the same. The Master and Commander scene in the middle of the movie where they fire off several cannons at once (not the early battle scene) that Jon demoed for me really stands out in my mind....it's just really clean bass.
Just like when comparing speakers, the differences between well recorded music and not so well recorded music is obvious, good bass and bad bass is obvious. An example is Sky Captain and the World of Tommorrow vs Monster House. Each has some extremely bassy footsteps in it. The ones kinda early by the robots in Sky Captain were pretty disappointing, they sound blehh and repetitive. The ones at the end of Monster House when the house grows legs are awesome - percussive and scary.
With music...well, to be honest, both with this sub and with Ryan's that I just heard, there really isn't too much to talk about in my opinion. It sounds natural, it just fits right in, so there really isn't much to say. If it stood out or did something wrong, it would be much easier to critique.