Got some dp numbers from the room. Various speaker placement was used just to test db from 35' away (the other end of the bar). The 18" had a grill rattle really bad at 90-110 Hz that I think was throwing off. When shooting across the floor the undulations in the old wood floor did weird things to bass with dead spots and concentration spots of base all over the floor...was so interesting. Anyway here are the Db numbers
Drive Rack 100Hz roll off
Test Old 18" Titan 48 Titan 48 Titan 48
Freq Mackie Floor Raise 20" Corner Loaded
30 69 64 70 78
40 83 92 90 96
50 85 84 90 97
60 94 85 100 96
70 95 97 98 106
80 99 96 102 108
90 102 103 104 108
100 102 99 106 100
110 96 95.5 97 98
120 92 99 94 85
On the build I should have thought about corner loading and placed the speakon connector in a different spot. This was just a prototype to see if these designs work. From what I can see they work pretty well with just one Titan 48 replacing an old Mackie 18. I'm sure I'll get flamed for something.
Numbers work out fine when you quote your post lol. It only seems to frop into the onscreen format after posting.
Nah we're not into flaming. What we are into is trying to help to get the best possible result you can out of your build.
What would really help to determine what your measurements mean would be some more info.
To get these results, is the limiter lighting up on the Driverack?In other words, are you pushing the T48 to 50V?
How far away from the corner was the T48? Was the mouth to the corner?
Did you leak test the T48 to complete your build?
What slope is set at 100Hz? eg LR24? That's the Low pass, but what is the high pass set at? And what is it's slope?
When the T48 is 20" above the floor, how far is the mouth away from the nearest wall?
In order to calculate if your T48 is performing as well as it can:
If you do more measurements, do them at 24 feet.
Each doubling of distance from 1 yard gives a loss of 6dB in sub output.
1,2,4,8, so, if your T48 is running as it should, at 8 yards your output is -18dB compared to 1 yard.
This also helps you calculate maximum SPL.
There is some anomolies in your results, hence the questions.
And, bass below 100Hz is omni directional. So a wavy floor should make no difference. What you're hearing probably is room nodes and modes in play...
2 x DR 250 (melded array) with March 2012 plans.
4 x 20" BP102 T39's, 2 x 28" 3012lf loaded underway.
3 x WH8 with melded array.Bunter's Audio and Lighting
"like"s would be most appreciated...