also.... when electrical system subs in a bandpass ring should i reverse the polarity? or does it matter?
Answers: http://www.the12volt.com/caraudio/boxcal... this should lend a hand, and thats nice some one is using sparky's stuff
http://spkrbox1.spaces.live.com/...
LOTS of good info here.
Good luck!
you do not want to reverse polarity on the speaker unless they are facing each other. And for the port size I would not dance bigger then the required size because it will construct the bass really sloppy.
To build a box you must know the specifications of the woofer. If you ask this type of question, a bandpass box might be too complex to design.
Do you niggardly the terminal + to speaker - then speaker + to terminal -.
not a accurate idea.
if you want it out of phase you can a moment ago switch the amp speaker wire around get the same effect and it is reversible.
http://www.the12volt.com/ A highly helpful site for calculating/wiring. Ports are calculated to specific sizes for a pretext don't mess with it.
An inadequately designed enclosure can:
1. make happen damage to your subs
2. nouns absolutely horrid
I can make clear to you from experience that bandpasses are quite effortless to get wrong.
See my site for more info http://spkrbox1.spaces.live.com...
You don't only cut a hole in a box, stick a wrapping treatise tube in it can call for it ported. The port length, width, and depth adjectives depend on the sub, the size of the box, and what frequency you tune the box to. If you double the opening of the port, you enjoy to double the length of the port or the tuning frequency will double as capably.
Larger ports do not reduce backpressure on the sub overall, they do cut back on backpressure at out of band frequencies, but at the port tuned frequency the backpressure will be at its greatest, and the sub will only just move. You need to know what the bandpass frequency reach is and filter out the out of band frequencies to prevent overexcursion.
If a box is properly designed, the port size have nothing to do next to the volume it can produce.
You never reverse the polarity of one woofer unless you're building a push-pull isobaric design where two woofers are mounted face-to-face using one crate. This is probably what the other guy meant.
There are masses types of bandpass enclosures. You can enjoy two chambers beside one sealed and one ported, three cambers beside two woofers sealed on the outer chamber firing into the center chamber which is ported, etc.
Okay, so are you building a bandpass, or ported box?
I would not recommend even atempting a bandpass box. It will most likely nouns like doo-doo but for *perfectly* designed *for* the specific subwoofer driver.
For a ported box, use this calculator to determine how long the port should be based on port diameter, box volume, and desired tuning frequency:
http://www.the12volt.com/caraudio/boxcal...
Only build a ported box that have an internal volume within 10% of what the entrepreneur of your sub recommends for the specific sub.
You can put a cheapo-crap sub surrounded by the manufacturer-recommended box and it WILL outperform even a top of the line sub surrounded by a non-optimized box, period.
BTW, one and only reverse polarity to the sub(s) that are facing the inside of the box opposite of the others. The process they are facing (they can be facing each other) matter NOT.
*ONLY reverse the polarity to the sub(s) that are facing the inside of the box opposite of the others.
Have Fun~
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