I understand the comb filtering issues and the less is more concept but these boxes in particular are designed to be expanded on not much different than expanding a line array.
Ivan, is there a box you can suggest with somewhere near a 100x30 dispersion that wouldn't break the bank I could consider?
And if the boxes actually do array-then adding another one in the intended angle will only increase the bass level (due to loss of pattern control)-as the cabinet should only be covering the speced coverage angle. The other box will be covering a different area-therefore not increasing the level at all-which is your intention.
Yes the bass will be louder-but now you will have to turn it down to keep the same tonal balance.
Of course if the cabinets don't have the pattern they say (a 30į cabinet is a LARGE cabinet-down to any decent freq), then you will have both cabinets covering the same area-with different arrival times-resulting in combfiltering.
What various cabinets "say" is often quite different than what they actually do-believe it or not.
Below is the measured response of an expensive loudspeaker (many times your budget).
Notice how the speced pattern is not even close to the measured pattern.
I am with Mac on this one-I don't see how the current speaker is covering the room (well at least).
Maybe a whole new approach is needed-but that would cost more money that the stated budget.
There are very scientific approaches to these types of problems (modeling), that give much better results than simply guessing.