EV Phoenix PX2181 / 18Sound 18LW2400

He just got told that a shared cavity reflex box is a bad idea and now we are recommending the g-sub?....

S7LNG wrote: Are we thinking the reflex G-Sub cab? Forward facing drivers

reflex drop low but if u want spl then u gonna need at least 3 doubles a side as already suggested here

I understand the idea behind designing a dual reflex cab with separate chambers for each driver, but the reality is if you're driving the box hard enough to melt a driver then it's only production tolerances that will prevent one from dying before the other and the surviving driver will have been pushed to within seconds of failure and probably should be reconed anyway. And it is typical practice to power a 218 cab from a single amp which is sized to power both drivers so if one dies the survivor will then be generously over powered which it's not likely to survive. So bottom line is this really isn't a big deal unless you know you will be powering each driver discretely, then by all means build cabs with separate chambers to minimize damage in worst case situations.

I agree about production tolerances being about the only difference between one driver dying and the second following it, but would qualify your comment about power.

If an amp can produce the right amount of power for both drivers, then one driver dies, the impedance of the remaining driver will be higher than for the original pair, so it's not like the amp is going to give its full 4Ω power to an 8Ω driver.

The real killer is that if one driver dies, the remaining driver is now in a cabinet effectively twice as big, which provides less physical damping of cone excursion. But you knew that part already, I'm sure.

Cheers,

David.