Rob Bird
Agent
- Joined
- Nov 21, 2004
- Messages
- 47
Ok, here are four configurations I've been working with in WinISD. The two drivers being compared are the Adire DPL-12 and the Tumult. I've double checked the parameters, and I can't really believe what I am seeing.
Blue: Vented DPL-12, 220.5L, tuned to 13.35 HZ
Green: Vented Tumult, 120L, tuned to 19 HZ
Yellow: Sealed DPL-12, 80L
Pink: Sealed Tumult, 75L
EDIT: Ok, my hosting server is down at the moment.
What I am seeing:
All of them taper fairly similarly down to about 50hz, where they are 1db down. At 30hz, the Blue and Green are 1.2db down, Yellow is 3db down, and Pink is 5db down. At 20hz, the Blue is 2db down, Green 4db down, Yellow 7db down and Pink 10db down.
Bellow 20 it gets crazy, and the Blue plot rolls down to -3db at 13.5hz. The Green Tumult plot is -10db at 15hz
I tried tuning the Blue and Green according to the EBS advice on the DIY Subwoofer page, so there is just a smooth rolloff on the shelf and no peaks)
----
Now, aside from the fact that the Tumult is walking all over the DPL in max output at 500W (116db vs. 111db), the DPL is (at least to my eye), simply an amazing woofer for sub 20HZ extension. It's absolutely dominating the Tumult.
Have I done something wrong here, or is the DPL-12 clearly better than the Tumult below 20HZ? Will these designs sound boomy? I read some mention of needing to be -9db at 20hz and -1 db at 30hz to account for room gain. Is that right, or should I be aiming for maximal flatness in the gain curves?
Much thanks,
Rob
Blue: Vented DPL-12, 220.5L, tuned to 13.35 HZ
Green: Vented Tumult, 120L, tuned to 19 HZ
Yellow: Sealed DPL-12, 80L
Pink: Sealed Tumult, 75L
EDIT: Ok, my hosting server is down at the moment.
What I am seeing:
All of them taper fairly similarly down to about 50hz, where they are 1db down. At 30hz, the Blue and Green are 1.2db down, Yellow is 3db down, and Pink is 5db down. At 20hz, the Blue is 2db down, Green 4db down, Yellow 7db down and Pink 10db down.
Bellow 20 it gets crazy, and the Blue plot rolls down to -3db at 13.5hz. The Green Tumult plot is -10db at 15hz
I tried tuning the Blue and Green according to the EBS advice on the DIY Subwoofer page, so there is just a smooth rolloff on the shelf and no peaks)
----
Now, aside from the fact that the Tumult is walking all over the DPL in max output at 500W (116db vs. 111db), the DPL is (at least to my eye), simply an amazing woofer for sub 20HZ extension. It's absolutely dominating the Tumult.
Have I done something wrong here, or is the DPL-12 clearly better than the Tumult below 20HZ? Will these designs sound boomy? I read some mention of needing to be -9db at 20hz and -1 db at 30hz to account for room gain. Is that right, or should I be aiming for maximal flatness in the gain curves?
Much thanks,
Rob