PDA

View Full Version : [Bandpass] How does this look?



Kangaroux
06-10-2012, 01:32 PM
4th order BP for 2 obsidian 12's. Gonna be running them off of 1800-2500w (1800w for daily 2500w for burps). Box is roughly 2.1 cube sealed (1.05 per sub) and 6.9 ported (or ~3.5 per sub). Port is 101.5 in^2 tuned to 40hz and uses a 4" kerf to help against any port noise. I didn't like how close the subs were to the port so I put in some big 45's to help prevent any dead zones. The setup is NOT built for competing, just going for a loud daily. The box will also be braced with several pieces of 1/2" threaded rod.

There's a typo on the sealed section, it's supposed to say 2.1 not 1.05.

http://i.imgur.com/1nHp7.png

Buck
06-10-2012, 02:13 PM
Looks good, yo.

wenn_du_weinst
06-10-2012, 02:18 PM
I think it may be pretty boomy actually.

The_Grimy_One
06-10-2012, 02:19 PM
Any idea what bandwidth this should play?

galacticmonkey
06-10-2012, 02:44 PM
Yeah, Id shrink the port and the ported chamber.

Shoot for around 2 cubes sealed after displacement, then build the ported chamber around 3-4 cubes with a 55-65in^ port. For my listening preferences, I do like a 40hz port. With those size chambers and small port, you should have response down into the teens and up to around 60-65hz.

Buck
06-10-2012, 02:57 PM
How loud are you trying to be?

SuperSaeYoung
06-10-2012, 03:55 PM
I've always wonder how do you put and take out the subs?

05trailblazer
06-10-2012, 03:56 PM
^^ when bulding them you put them in first then seal it off. common sense.

Buck
06-10-2012, 03:58 PM
I've always wonder how do you put and take out the subs?

If you don't have an access panel or have a port large enough to crawl through, then you put them in there and hope for the best.

SuperSaeYoung
06-10-2012, 04:02 PM
If you don't have an access panel or have a port large enough to crawl through, then you put them in there and hope for the best.

I would love to see pics or vids of this!

DBBOOM
06-10-2012, 04:07 PM
Gonna be boomy/peaky with the ported side that large. 4 - 5 cubes would prolly give better music range.

Buck
06-10-2012, 04:08 PM
I would love to see pics or vids of this!

Sent you a pm :)

wenn_du_weinst
06-10-2012, 04:18 PM
I did a little math and right now you have a pretty good burp box at 40hz.

Kangaroux
06-10-2012, 06:21 PM
This is basically the same box I have for my current 12 just scaled up. It's peaky but on the lows at around 33-34hz. Cabin gain evens out my response pretty well. If I had to aim for a frequency response I would say 25-45hz. My current box is 1 cube sealed 2.8 ported with 50 in^2 of port tuned to 40 and I like how it sounds

Kangaroux
06-10-2012, 06:25 PM
Now that I think about it, I like how it sounds at around 2.8 ported. I might do 5.5-6 ported instead. No point in trying to tweak it only to find out I don't like it and have just gone through 2 sheets of wood

wenn_du_weinst
06-10-2012, 06:41 PM
when I looked it wanted ported to be smaller then the sealed section to play flat.

Kangaroux
06-10-2012, 07:32 PM
when I looked it wanted ported to be smaller then the sealed section to play flat.

Yeah that's the same thing I got but this is peaky enough on the lows and my cabin gain is heavy enough to even it out pretty well.