When building a ported box for an SQ system...

[blackbonnie]

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]

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]

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]

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]

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]

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]

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]

so what are the advantages of running a low tuned ported enclosure then a sealed enclosure in an sq application

[J31Rob]

tune to 0 hz.

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

[dman4486]

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]

so how do you determine exactly how low to tune? and how big your box will be?

[dman4486]

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]

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

[blackbonnie]

what program is that on?

[dman4486]

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