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frogcase2002
12-01-2012, 09:06 PM
Just did a bandpass that's 2.1 sealed and around 4.2 ported. What size round port/ports would I want. Going to be porting through the rear deck. . And also will there be a difference in how much is external and inside other than internal volume

frogcase2002
12-01-2012, 09:11 PM
Right now I have removable square port firing into cabin through the fold down seats. I'm just thinking I can get louder with it loading off the rear window and will be easyer to seal off trunk

frogcase2002
12-01-2012, 10:07 PM
Also. Does it effect anything cutting out some of the rear deck (where the back speakers go)

frogcase2002
12-02-2012, 07:14 PM
Or should I do a square or rectangle through the rear deck

brandon_s0854
12-02-2012, 07:54 PM
Also. Does it effect anything cutting out some of the rear deck (where the back speakers go)

Well, it'll affect the structural integrity of the rear deck, but I don't think it's anything to worry about.

---------- Post added at 06:54 PM ---------- Previous post was at 06:54 PM ----------

What size and how many subs to answer your other questions.

frogcase2002
12-02-2012, 08:02 PM
Well, it'll affect the structural integrity of the rear deck, but I don't think it's anything to worry about.---------- Post added at 06:54 PM ---------- Previous post was at 06:54 PM ----------[/SIZE]

What size and how many subs to answer your other questions. one 15"zcon on 3000 watts

brandon_s0854
12-02-2012, 08:38 PM
General rule of thumb is half cone area. You could do a single 10" round port. If you're using flared ports, and I'm talking something with a good flare on it like the psp aeroports. You can get away with less. You could do two of their 6" ports. You can find them on Parts Express (http://www.parts-express.com/pe/showdetl.cfm?partnumber=268-354) or even eBay (http://www.ebay.com/itm/6-x-17-Precision-Sound-Flared-Port-Tube-PSP6-BKNT-Kit-/370527789920).

frogcase2002
12-02-2012, 08:43 PM
General rule of thumb is half cone area. You could do a single 10" round port. If you're using flared ports, and I'm talking something with a good flare on it like the psp aeroports. You can get away with less. You could do two of their 6" ports. You can find them on Parts Express (http://www.parts-express.com/pe/showdetl.cfm?partnumber=268-354) or even eBay (http://www.ebay.com/itm/6-x-17-Precision-Sound-Flared-Port-Tube-PSP6-BKNT-Kit-/370527789920). I'm probley wanting to do either square/rectangle port with mdf or use just pvc cause I'm going to be making a lot of them to get the tuning right and keep one for daily and one for burps

brandon_s0854
12-02-2012, 08:47 PM
Well 10" pvc if you can find it. Or a 90 in^2 slot port; doesn't matter either way. I'm assuming anywhere from 80-100 in^2 would be fine.

frogcase2002
12-02-2012, 09:58 PM
Well 10" pvc if you can find it. Or a 90 in^2 slot port; doesn't matter either way. I'm assuming anywhere from 80-100 in^2 would be fine.
You think that much for 4 cubes

brandon_s0854
12-02-2012, 10:04 PM
You think that much for 4 cubes

You could probably get away with less, but like I said, general rule of thumb for 4th orders is half cone area. I have 67.5 in^2 in mine and it's only 2.25cf. Definitely don't do less than 60. It depends on what you're tuning it to as well. The lower you tune it, the less port you really need.

frogcase2002
12-02-2012, 10:43 PM
You could probably get away with less, but like I said, general rule of thumb for 4th orders is half cone area. I have 67.5 in^2 in mine and it's only 2.25cf. Definitely don't do less than 60. It depends on what you're tuning it to as well. The lower you tune it, the less port you really need. I think I mite be able to get a 6 by 10 in the rear deck. How far do you think I need to keep the port away from the window?

brandon_s0854
12-02-2012, 10:48 PM
I think I mite be able to get a 6 by 10 in the rear deck. How far do you think I need to keep the port away from the window?

I'm not sure. I've never ported through rear deck before. Maybe someone else can chime in on this. There's no way you could do a 6x12 port? 60 just seems a little small. How much power are you running again?

frogcase2002
12-02-2012, 10:50 PM
I'm not sure. I've never ported through rear deck before. Maybe someone else can chime in on this. There's no way you could do a 6x12 port? 60 just seems a little small. How much power are you running again?
3000..

brandon_s0854
12-02-2012, 10:54 PM
What do you want to tune to? I'm going to put this in WinISD and look up port velocities for ya.

frogcase2002
12-02-2012, 11:00 PM
Well ill be making a few but I like about 43 for daily.... its 4.2 without a port. But half the port or so will be out of the box

brandon_s0854
12-02-2012, 11:21 PM
Well, it's not as bad as I thought. I generally design for <30m/s. You can see that the 6x10 port is ~30m/s and the 6x12 is ~25m/s, so you're right on the edge with the 6x10 port. Obviously the 6x12 port is going to have less port compression so will probably yield a little more SPL, but nothing that you would be able to tell by ear. And with tuning that low, you'll probably be okay. Honestly, I'd tune higher, closer to 50hz, but then you'd definitely want more port. This is why designing is so hard. There's so many variables and everyone likes a different sound.


26537989

frogcase2002
12-03-2012, 12:32 AM
How long of a port if its 10 by 6

brandon_s0854
12-03-2012, 12:33 AM
It's in the image. 14.34 is what WinISD recommends. 14" would be fine.

frogcase2002
12-03-2012, 01:52 AM
It's in the image. 14.34 is what WinISD recommends. 14" would be fine.
What if I did 8 by 8? Think that would be better?

brandon_s0854
12-03-2012, 09:20 AM
What if I did 8 by 8? Think that would be better?

Slightly. I doubt you'd hear the difference. I'd just put in the largest you can fit. Try to get as close to 80 in^2 as you can.

frogcase2002
12-03-2012, 09:34 AM
Anyone know how far I should keep an 8x8 port away from my rear window

GeekSquad
12-15-2012, 01:09 AM
I did a caddilac witha sixth order firing into the rear window recently. I made a fiberglass port that was the radius I wanted and glassed it to the rear deck. Besides the top of the car shaking, I havent heard any distortion from the port. Also, the shape of a rear window is actually great for bass lol. Here is a vid of the car Im talking about:

Neat Caddilac STS Install - YouTube (http://m.youtube.com/watch?v=nYQQEQ4ZQfs)