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-   -   Enclosure help needed! (http://www.diyaudio.com/forums/car-audio/238343-enclosure-help-needed.html)

Betrdaz 27th June 2013 03:35 PM

Enclosure help needed!
 
So I am a carpenter i have all the tools and material i could ask for when looking to build a sub enclosure. Now I need someone much smarter than I to help me design it. I want to build a 5th order bandpass specific to my subs and amp. If anyone has any experience or advice on the subject it would be much appreciated. Ill have to check specific model but I have 2 Polk audio 12's that I believe are 350w rms each. I have a rockford fosgate 700bd1 amp powering them.

THUMP LUMP 27th June 2013 04:13 PM

Follow this link and download. LinearTeam

someone1 28th June 2013 04:26 AM

I would also go to stevemeadedesigns.com and go to the enclosure fourm section; then search 5th order bandpass and see what comes up. There's a good amount of knowledge to be had there imo. Good luck none the less.

Aleksrussian 3rd July 2013 01:40 PM

WInisd is a good program to get you started, find all the parameters online for you subs and enter them into the program than, play around with different box sizes and types to see what gives you the flattest response. Mind me asking why you want a bandpass enclosure?

Aleksrussian 3rd July 2013 01:53 PM

You said you wanted someone smarter than you to help, well here are some proffessionals and their thoughts on bandpass enclosure, the guys at JL Audio,

JL Audio header Support Tutorials Tutorial: Bandpass Enclosure Characteristics

Read through that, the bandpass enclosure is horrible for everything but sheer output plus they are extremely unforgiving if you make the slightest mistake in construction or size calculations, don't listen to the schlubbs that tell you "go bandpass" "go ported" maybe it will be loud but will sound bad. Unless you are going for competition of course, if you are interested in a high quality sound that has plenty of output just go with a manufacturer recommended ported box, or a sealed if you are willing to trade off a little SPL for a little SQ. the advantages you gain from a bandpass box can easily be achieved with more power or better subs plus you will avoid all the headache and uneven frequency response, not to mention bandpass enclosure especially the dual reflex ones mess up your subwoofers with too much power and you won't even know anything is wrong until your woofer is blown my 2 cents

THUMP LUMP 3rd July 2013 05:36 PM

Would someone please explain to me the continued use of the misnomer "(X)th order bandpass box"? :rolleyes: Even better, name the orders. ;)

Aleksrussian 3rd July 2013 07:19 PM

Don't know too much about all the orders, but I have seen up to 8th order. Basically it just adds complexity and more twists and turns, honestly I have no clue why anyone would want a bandpass enclosure if they are not in a SPL competition

THUMP LUMP 3rd July 2013 08:01 PM

Actually, my last post was intended as a bit of a taunt as there is no agreed upon definition (to my knowledge) as to what "orders" are. Check out the thread here > need help with abc enclousure for pair octane r12d and you will see what I mean about "orders" and bandpass enclosures in general.

Aleksrussian 4th July 2013 01:59 AM

Aha! How could I miss that lol :rolleyes:

OscarS 13th July 2013 02:34 AM

Quote:

Originally Posted by THUMP LUMP (Post 3548384)
Actually, my last post was intended as a bit of a taunt as there is no agreed upon definition (to my knowledge) as to what "orders" are. Check out the thread here > need help with abc enclousure for pair octane r12d and you will see what I mean about "orders" and bandpass enclosures in general.

That thread only adds to the confusion just because one person doesn't like the nomenclature that already exists. Adding Xovers changes the order because the total order of the bandpass enclosure is DIRECTLY related to the roll-off on both the low and high end of the passband. If one end is now steeper due to passive xover, it has a greater slope, thus order, just as crossovers do. It doesn't add additional resonances, which is what you seem to think that others think that, but no one ever said the additional order added extra resonances.

Ever heard of a 6th order bass-reflex vented enclosure? They exist. Their order is 6. It is not a bandpass. The roll off is -36dB/octave. Does it have two different Fb's just because the order is "6"? Nope, and no one ever said it did.

http://www.xlrtechs.com/dbkeele.com/...Alignments.pdf


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