Building box for 1st SPL comp

[skmfkr 5,000+ posts]

where is vr, ga?

 

[bimmer540i 10+ year member]

So, I've been planning to sell my audiobahn 12 for awhile so its going up on ebay. I'd like to keep my Kole audio sub just because I got it so cheap. Is my Audiopipe sub out of the SPL realm? I mean just to use it until I get some money up.

 

[bimmer540i 10+ year member]

VR is villa rica GA. It is on the far midwest area of GA, about 25 miles from Alabama.

 

[bimmer540i 10+ year member]

Ok, I might just try out the 15. I have actually never even used this sub before. I bought it from a friend for pretty cheap. It doesn't have a huge magnet or crazy travel or anything, but It should be easily upgradable. Last night at the comp, the highest two 15 inch spl was 142 from a Q logic 15 with my amp in a 4 cubic Ft ported box, and a 143.8 in a 2 cubic ft box. Are these numbers low? I am pretty new to SPL comps. The equipment these 2 were using were certainly not top of the notch.

 

[squeak12 10+ year member]

If you have a BMW, Your not gonna do very good because the trunk is completely sealed from the cab.

 

[80INCHES 5,000+ posts]

try a 6th order bandpass

80

 

[btnhfan 5,000+ posts]

What car is it in?

 

[bimmer540i 10+ year member]

It will be in a BMW 540i. Unfortunately, the rear seat does not fold down. but, the same could be said about cadillacs whose trunk seal very well also.

try a 6th order bandpass

I'm sorry, I dont know what that is. I know the basics, but I'm constantly trying to learn new things.

 

[dleccord 5,000+ posts]

12 r w/ 2500d w/ a good box..

 

[btnhfan 5,000+ posts]

Dont do a bandpass.

Too complicated to test and get right.

Do you have rear speakers in the rear deck?

 

[bimmer540i 10+ year member]

sure do. Why?

 

[btnhfan 5,000+ posts]

Tak them out.

I would try firing the sub forward, and the port up at the holes for the rear speakers.

Try a tuning frequency of 45hz or so

 

[xluben 10+ year member]

take em out!

http://www.subwoofertools.com/forum/ported-box.asp?Ew=34&Eh=16&Dia=9&Xmax=16&Vd=.1&NumW=1&Vb=2&Fb=50&Qts=&Vas=&Fs=&CE=0

do that box for now.

then save a few bucks and get a type r 15 and a 100W+ amp and you should be able to do decent numbers.

also, you should always be looking at the RMS ratings of amps and subs.

 

[bimmer540i 10+ year member]

Wow thanks for the link! I'll be picking up some MDF tomm! I'll post back when i get this thing started.

 

[bimmer540i 10+ year member]

Ok, just realized something(amazing isn't it?) I have a maximum height of 16 inches to mount a 15 inch speaker. I dont think that will work out. Does anyone have any box plans where the speaker is being fired upward and is tuned to a high hz? Will mounting the speaker firing upward hurt SPL?