Could someone check my math?

[BlactimusCrime 10+ year member]

I have come up with a box design for my isuzu rodeo. For a DD9518g D4 on 2 DSC1500s strapped at 2. Box is 6 cubes after displacements, 114 sq inches of port (38"x3")and 22.75 inches long. Box is sub up, port back along the bottom of box. Supposed to be tuned to 40hz

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[quackhead 10+ year member]

i came up with 40hz.

 

[THATpurpleKUSH 5,000+ posts]

yep, tuning is around 40hz and the port size exceeds the 9:1 ratio by a significant amount. Make the port more square and less rectangular. The current port is improperly tuned to begin with and you are added phasing and airflow issues by exceeding a 9 to 1 ratio with the opening, Bad design, start over.

 

[BlactimusCrime 10+ year member]

why in the heck does it matter what the hight/width ratio is?

 

[quackhead 10+ year member]

hmm...maybe you should reconsider building your own box.....what others hinted at was trying to avoid sounding like a toilet bowl fart.

 

[THATpurpleKUSH 5,000+ posts]

[quote name='BlactimusCrime']why in the heck does it matter what the hight/width ratio is?[/QUOTE]

Because of the airflow
@keep_hope_alive ; @Moble Enclosurs ;


Those guys can explain it better.

 

[keep_hope_alive Premium Member]

Loudspeaker Design Cookbook 7th Edition Book 500-035

if you don't have this reference already, get this before you design another enclosure. read it. everyone will reference it.

PM me if you just want an electronic version.

 

[Sub Woofin 10+ year member]

Loudspeaker Design Cookbook 7th Edition Book 500-035
if you don't have this reference already, get this before you design another enclosure. read it. everyone will reference it.

PM me if you just want an electronic version.

can anyone pm you for it, or is it exclusively for Blactimus?

 

[THATpurpleKUSH 5,000+ posts]

can anyone pm you for it, or is it exclusively for Blactimus?

x2, I would love a copy

 

[Phoenix Risen 10+ year member]

common eddie, you know better than that....

i would also love a digital copy of that, i had it once but it disappeared.

 

[BlactimusCrime 10+ year member]

Loudspeaker Design Cookbook 7th Edition Book 500-035
if you don't have this reference already, get this before you design another enclosure. read it. everyone will reference it.

PM me if you just want an electronic version.

Thanks!

common eddie, you know better than that....
i would also love a digital copy of that, i had it once but it disappeared.

No, I dont, have you ever seen me run a slot port in my car? nope, Im always lazy and use aeros.

 

[BlactimusCrime 10+ year member]

Going to go with a 26w X 4h and 20.75L port

 

[Phoenix Risen 10+ year member]

that should get the job done, also remember loading into the back wall may very well drop your effective tuning a bit.

 

[BlactimusCrime 10+ year member]

that should get the job done, also remember loading into the back wall may very well drop your effective tuning a bit.

Thats why its tuned so high.

 

[RangerDangerV2 5,000+ posts]

I say aeros... but thats just me.