The rule of thumb for distance for a port from a wall is roughly twice the diameter of the port, but that's not the only thing going on as far as placing the speaker near a wall.....same for your seat up against the wall, that's not a good place for it. Did you ever think of going the long way in that room? I know it would change seating, but....
The 580s are good speakers, rather have the 590s tho (I have both). Speedwoofer is a good choice but I'd still go a bit larger with SVS, Hsu, Monolith, etc as mentioned.
The 580s are good speakers, rather have the 590s tho (I have both). Speedwoofer is a good choice but I'd still go a bit larger with SVS, Hsu, Monolith, etc as mentioned.