DD 3512 Box???

[resko1 0]

Ok. So I keep hearing different things from different people. Maybe some people over here have some decent advice since im not getting it else where. So

I have a DD3512. DD recommends 2.5cu ft ported at 40 hz for their enclosure. Some of the local guys here who run DD say NO. that I need about 4cu ft ported about 36-38hz for one DD 12. Then another guy I was talking to online who tests TS parameters and sub on a daily basis says that the 3512 can play great in a box down to a cu ft. but is good in about 2-2.5cu ft ported at about 34hz.

WTF?! All these dimensions contradict eachother and I know DD isnt a super woofer that can play in anything so someone help me out here. This is gonna be used in a 139.9 bassrace application and powered by roughly 2-2.2k at .75ohms. It is in a trunked car and I haven't decided if im gonna load to the cab or to the rear of the car yet.

Anybody have experience with DD subs? I know with this sub and the power i have (sundown) I can easily hit 145db if properly done, because ive seen it! Unfortunately, I didn't get a chance to look at the box to well or talk to the guy so im still stumped!

[killa101 0]

So is this going to be for strict competition use or more for an everyday use?

I'm not surprised to see many different recommendations. It is typical to have many different configurations that the sub can play well in. The issue is that you are going to need to specify exactly what you are looking for from the enclosure. If you are looking for a competition enclosure then you will get a different recommendation then an enclosure for a daily driver.

[resko1 0]

So is this going to be for strict competition use or more for an everyday use?

I'm not surprised to see many different recommendations. It is typical to have many different configurations that the sub can play well in. The issue is that you are going to need to specify exactly what you are looking for from the enclosure. If you are looking for a competition enclosure then you will get a different recommendation then an enclosure for a daily driver.

Not necessarily. The key to winning a bassrace comp is to consistently average your objective db level( ex. 139.9) throughout 30 seconds on music. In order to do that your box has to play pretty flat within a certain range, or just play a song that doesn't vary with the tones. (no fun in that!)

I will be using this as a daily on 1k, but when i go to compete i want to be able to strap in an extra battery and the 2000d and go to town!

My goal is to have the sub play at a pretty flat response between say 30hz and 70/80hz but still have peak output and excursion. If you catch my drift, there is no ""SQL"" here in a sense but there can be a balance between flat response and peak output. SPL is not necessarily needed in bassrace since theres no limitations to the amount of woofers/amps/power. But I am challenged in the since that I can only run 1-12 or 2-10's because of space limitations, so I have to get max output but maintain a somewhat flat response. It would be stupid to try and stick an 18 that needs a 7cuft box in a trunk thats only about 6cuft. And DDs are known to be "peaky" which is why they are awesome SPL woofers. So im looking to trade off some of that SPL for flat frequency.

[resko1 0]

ttt

Anybody got any input on this?