Double Check my measurements for AQ HDC3 18 PLEASE!!

[giants25al 10+ year member]

After playing with some numbers and coming up with a design I want to double check with some of you more knowledgable members in here to make sure I dont waste my time building this box. If you have any input please share!!! Here's what I came up with. First Sub will be 18" HDC3 as stated. Amp will be AQ1200 (more power will be coming soon/ future plans for 2 18" HDC3's on 2 AQ 2200's), going in a chevy blazer S10.

Width= 36"

Height=20"

depth=24"

gives me + 8.5^3 before ports and speaker

Ports will be (One on each side of box)

Width= 3.5"

Height=18.5"

Lenght=15.5"

total port area= 129.5in^2

gives me 6.5ft^3 @ 38hz. before speaker displacement

Only question I have is using the re calculator I had to put in a port width of 7". Would I be better off with just 1 7" port with the same height and length measurements above or go with my idea of cutting the port width in half and making two 3.5" ports as stated above. I know that the extra piece of MDF will cut into my dimensions a little but I can't see it making that big a difference. I'm lookin for around 6ft^3 gross @ 37-40 hz. Thanks in advance for any info/help. I really don't want to waste my time if I dont have to //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif

Edit: Speaker will fire up and port to the back of truck

Click to read more...

 

[Anonymous 10+ year member]

either way will work and you will have more than enough room and it should be loud as hell with that port area and tuning.

 

[giants25al 10+ year member]

Aight good thats what I was hoping to hear!!! anyone else with any input or advice???

 

[giants25al 10+ year member]

Anybody??? I'm guessing my design is a good one. I'm sure if it was terrible I would have definitly heard some more responses

 

[mlstrass 5,000+ posts]

You only need 104^2 of port for 6.5cubes....

 

[giants25al 10+ year member]

wouldn't that change my frequency though. Also where at in my dimensions could I adjust to get the proper size and tuning, I thought I had this figured out lol. Just make the port a little shorter ??

 

[giants25al 10+ year member]

Also are you referring to 6.5^3 before ports and sub displacemnt or the gross displacement. I'm showing a net of 8.5 before the port and sub

 

[TSGP]

You only need 104^2 of port for 6.5cubes....

he doesn't have much more then that...

Its fine....12-15 sq inches is just a rule of thumb.....

Box seems to ok, just make sure you put the baffle on the outside of the enclosure //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif and make sure you double layer everything