Venue eq issues.

My friend owns a laser tag venue, we do events once a month, all my kit has been up there for ages due to the 8 flight of stairs.

The problem i seem to have is there seems to be very little sub coming out, at first I thought it was my crappy eqing skills which I'll be the first to admit I have a lot to learn and the not so good equipment I have but a friend took half has rig up there and I know his rig sounded very good on the sub at other venues and the same thing happened very little sub, he knows a lot more than me so i'm presuming its the actual venue.

My kit:4 gsubs with 18xbs, 4 black box with 15b's, and 4 black box tops with 12mb, fane st5020 x2, emernace psd3003. 2 x 5000vz, 2 x 3600vz, 2 x 802, 1 x 602. 2 x dbx.

Dbx setting 35-80, 80-150, 150- ????totally forgotten what i set the over settings at but theirs no problem with anything above 80hz so that doesn't really matter.

I can't remember all my friends equipment but he had Ligwa scoops running off qsc amps and dcx.

We both tried many different eq settings but just couldn't seem to get any decent sub, now I'm thinking its the strange shape of the venue and the ceiling. I've hopefully posted links to the pictures of the venue and the ceiling. I also used the dbx rta input but I find the results sound awful.

I marked the floor plan with where we had the stacks, we are limited to where the stacks can go due to power and speaker cable length, the two different stacks were not used at the same time!

I'm sure I should get a half decent sound form the set up even though its getting on a bit, I don't really have the option of getting anymore gear so was hoping to make the best of what i got. 

The venue floor is 300sqm and the ceiling is about 3.5-4 meters high, floor is solid concrete built in the 70's I just thought I'd give everyone as much info as possible. I'm sure I had more sub at other venues but the rig has been up there so long that I can't remember to be truthful. 

My thinking was maybe the funny ceiling shape was causing some wired cancellation of the low freq, maybe a thought could be cover the ceiling with something, bearing in mind its quite a large area. Would a large parachute/drapes help or maybe boarding it up?

https://www.mediafire.com/?qu1f8wxnxlqk53z

https://www.mediafire.com/?5blxtd76ud6oh89

https://www.mediafire.com/?ve7d535xvu79e3l

The basic method is to flip one box out of polarity, play a sin wave through both boxes at the acoustic crossover frequency (with your normal crossover settings present) and gradually add delay to the reflex box until you get maximum cancellation between the two. Then flip polarity back to normal and you should have maximum summation. Walk the venue after doing this and take a look at the amount of delay added too as a reality check - it should realistically be in the single digits (or possibly low double digits depending  on the boxes) of milliseconds.

 

I haven't used B-Box for years and when I did we were on FDS-360s so I never really paid much attention to the crossover point, but 150 sound very low for the 15>12" point and I have used Turbosound 30/100Hz boards to run black box 4 way before so letting the 15 down to 30 is no probs, but 50/60 (I assume your DBX allows overlap) would be a min to get more energy into that area.

 

You really need to do an impulse test to line up, if you don't have anything more hi-tech a 1.5V battery and a 'scope with a mic will do...