Pd 1850 tuned lower?

I HAVE the cubo 18 ext with pd 1850´s in them.

But i did not think they went down deep enough. Lots of spl but not very deep.

And I know that "tuning"/modifying a horn is making a completely new box, but what i meant was if I could get the same kind of sol and throw from the pd´s just lower.

But what i have found this afternoon is that error was in amp rack.

I drove the 2 cubo´s with a brigded crown ma 2400 which should enough power for them, and I have asked on other (danish) forums who said power would not change the sound only volume.

BUT today i installed my newly bought crown ma5000vz instead, I only drove the 2 cubos in stereo mode 3/4 on the throttle knobs and I did not even get to 0 db on the mixer because the sound was REALLY loud. This test was only done i my garage so it is not that reliable, BUT I have however done that test to all my speakers system, just for test and so, but this was clearly the loudest setup I have ever had. Not as deep as my old 4order bandpass double 18´s but the spl on the whole scale more then makes good for that. So I guess the saw is gonna make another couple of cubo´s soon and then I have 2 more blown pd 1850 which need new cardboard and then I am ready to make some noise.

Should i go stereo or parallel mono then on the crown?

But I am sorry for my earlier posts, I did not think the bigger amp would that much difference.

Any comments on parallel mono go stereo mode? 

Seems parallel mono should give a lot more power? 

How much watt is the limit in pd 1850 cubo extended? 

Are there any diffent ways of stacking 2 a side that works better?

 

ooops sorry posted specs for the v1200.... changed.... specs still differ... qms of 1850 is as of the pd website, could be a typo...

if thats te case i would suggest getting the smaller amp checked out and check te cables you used for bridge as i said they should not be wired te same as for normal operation [im sure te ma do bridge on both channel + pins no?]