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View Full Version : When building a ported box for an SQ system...



blackbonnie
06-18-2008, 09:43 AM
how do you determine everything? i believe it is tune very low, but can someone maybe do a quick walkthrough on how to design a ported box for an sq system/sub? i know how to build boxes and all, but every ported enclosure i have designed was for spl, i wanna learn sq now. help is greatly appreciated

dman4486
06-18-2008, 09:45 AM
my understanding and little experience has shown that larger volume enclosures, low tuning and individual airspace give outstanding sq

edit: and decent sq equipment

blackbonnie
06-18-2008, 09:47 AM
my understanding and little experience has shown that larger volume enclosures, low tuning and individual airspace give outstanding sq

edit: and decent sq equipment

as in individual airspace, are you meaning seperate chambers if running 2 subs?

dman4486
06-18-2008, 09:48 AM
as in individual airspace, are you meaning seperate chambers if running 2 subs?

yes


I use mine as an example....2 10" subs, 2ft^3/driver, 24hz tuning. After calculations this yields a flat response, but with cabin gains there are a few little peaks

rollerdj
06-18-2008, 09:53 AM
great timing. i was just starting to plan one out myself. i know tuning low will help give a flater (sp?) responce. but as far as how many cubes (large or small) and how much port area i don't know.

sqhertz
06-18-2008, 10:09 AM
i know too much port area (14-16 sqin per cuft) will give more of a boomy response and may cause muddiness on quick basslines.
not sure about the rest though.

dman4486
06-18-2008, 10:14 AM
i know too much port area (14-16 sqin per cuft) will give more of a boomy response and may cause muddiness on quick basslines.
not sure about the rest though.

the other problem with larger port areas is that it is hard to get the port long enough to get the low tuning you want

blackbonnie
06-18-2008, 03:23 PM
so what are the advantages of running a low tuned ported enclosure then a sealed enclosure in an sq application

J31Rob
06-18-2008, 03:24 PM
tune to 0 hz. :p:

i have no idea. bump for me wanting to know as well. not rly into SQ, but i could be.

dman4486
06-18-2008, 03:25 PM
so what are the advantages of running a low tuned ported enclosure then a sealed enclosure in an sq application

I have noticed the lows are more pronounced...and overall output is greater

blackbonnie
06-18-2008, 03:30 PM
so how do you determine exactly how low to tune? and how big your box will be?

dman4486
06-18-2008, 03:32 PM
so how do you determine exactly how low to tune? and how big your box will be?

I like to have the enclosure itself produce flat response.....yes gains of the auto will create peaks, but not nearly what a high tuned box will

dman4486
06-18-2008, 03:35 PM
this is a graph for output of a single 12" pg rsdc....the red line is recommended flat response, but in this case the owner wanted a little more output(black line). for that I dropped the size of the enclosure a little and raised the tuning just a bit.

PG recommends 1.5 @32 for this sub, but that puts a peak at 50hz...notice where the peak is for the black line
http://i264.photobucket.com/albums/ii191/dman4486/rsdcbox.png

blackbonnie
06-18-2008, 03:37 PM
what program is that on?

dman4486
06-18-2008, 03:39 PM
what program is that on?

box port design II

and this is the enclosure I have for my rsd's(sig)

red line was my target, and black is what was built
http://i264.photobucket.com/albums/ii191/dman4486/rsdgraph.png

Parker G
06-18-2008, 03:52 PM
Do a T-Line or a sealed box with a low Qtc