1. Double Check my measurements for AQ HDC3 18 PLEASE!!

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

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

2. Re: Double Check my measurements for AQ HDC3 18 PLEASE!!

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.

3. Re: Double Check my measurements for AQ HDC3 18 PLEASE!!

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

4. Re: Double Check my measurements for AQ HDC3 18 PLEASE!!

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

5. Re: Double Check my measurements for AQ HDC3 18 PLEASE!!

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

6. Re: Double Check my measurements for AQ HDC3 18 PLEASE!!

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 ??

7. Re: Double Check my measurements for AQ HDC3 18 PLEASE!!

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

8. Re: Double Check my measurements for AQ HDC3 18 PLEASE!!

Originally Posted by mlstrass
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 and make sure you double layer everything

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