two 4" or one 6" Port for 2 x12 - Realm of Excursion



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Old 02-14-2014   #1 (permalink)
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Default two 4" or one 6" Port for 2 x12

I'm building a box for my 2 Sundown x12 D4 ohm 15h x 36w x 25d =6.33cuft after sub & 2 4" ports, it will be some where around 5.85 cuft maybe a little smaller. I can fit a 6" port with out flare ends. What do you guys think, two 4" with flare ends or one 6" with out flare.

I'm going for 28hz. Should have the subs in today. Still waiting on the BC3500D from Crescendo.

Thanks.
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Old 02-14-2014   #2 (permalink)
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Default Re: two 4" or one 6" Port for 2 x12

Two 4" aeros gets my vote
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Old 02-14-2014   #3 (permalink)
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Default Re: two 4" or one 6" Port for 2 x12

Although, neither of those options is even close to giving you enough port area
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Old 02-14-2014   #4 (permalink)
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Default Re: two 4" or one 6" Port for 2 x12

Yeah more like two 6 inch ports. Those x12s can displace some serious air.
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Old 02-14-2014   #5 (permalink)
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Default Re: two 4" or one 6" Port for 2 x12

Yeah, two 6" ports put it at 9.66 sq in per net cube ft. That would work well.
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Old 02-14-2014   #6 (permalink)
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Default Re: two 4" or one 6" Port for 2 x12

Port area is a direct relation between cone area and air displacement.say two t welves with 20 mm xmax need a single 6 inch port than two t welves with 40mm xmax will displace twice the amount of air than it will need roughly twice the port area. Now there are exceptions but this is a god starting point.
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Old 02-14-2014   #7 (permalink)
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Default Re: two 4" or one 6" Port for 2 x12

If I do a slot port will I still have enough room for the 2 12. I would have to use RE box calculator cause I not good with slot ported box.

If someone don't mine helping me do a slot port box...then i'll do that.
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Old 02-16-2014   #8 (permalink)
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Default Re: two 4" or one 6" Port for 2 x12

This dose not look right. Can some give me a helping hand. I'm not asking you to do it for me. The cut sheet is way off from this box.

http://s655.photobucket.com/user/sol...box-1.png.html

http://s655.photobucket.com/user/sol...hzbox.jpg.html

http://s655.photobucket.com/user/sol...zport.jpg.html

Last edited by soloxp; 02-16-2014 at 03:07 AM.
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Old 02-16-2014   #9 (permalink)
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Default Re: two 4" or one 6" Port for 2 x12

What is it you are asking us to do? The calculated tuning is off, that is the only thing I see without running numbers off the 3D model. You only have 28.75" of port length. What else are you asking?
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Old 02-16-2014   #10 (permalink)
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Here are the pics so we don't have to click back and forth.





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Old 02-18-2014   #11 (permalink)
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Default Re: two 4" or one 6" Port for 2 x12

Will this be good enough air for this box...5.85 cu.ft 8" port tune to 29hz.

29hz.jpg Photo by soloxp | Photobucket
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Old 02-18-2014   #12 (permalink)
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Default Re: two 4" or one 6" Port for 2 x12

You should be ok with that
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Old 02-18-2014   #13 (permalink)
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Default Re: two 4" or one 6" Port for 2 x12

Thanks for reply.
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Old 02-18-2014   #14 (permalink)
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Default Re: two 4" or one 6" Port for 2 x12

Make sure you post pics once you Build it!
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Old 02-20-2014   #15 (permalink)
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Default Re: two 4" or one 6" Port for 2 x12

Will do. Quick question...will it make a difference if the port is in between the 2 sub's? Or right of the sub's like I have it now. I like the look of the port in between.

Thanks
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Old 02-20-2014   #16 (permalink)
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Default Re: two 4" or one 6" Port for 2 x12

Port in the middle would be best. The subs load evenly with the port in the middle.
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Old 03-09-2014   #17 (permalink)
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Default Re: two 4" or one 6" Port for 2 x12

Well, here the box...I was going to try to make the port flare but did have time. Also I ended up getting the SAZ-3500D over the Crescendo BC3500D cause it was going to be another 2 weeks to get the amp.

Also got this battery (Sears.com)... [email protected] they drop the price again need to go back and get's soom money back. This will be the sec time.

IMG_20140301_192936.jpg Photo by soloxp | Photobucket

IMG_20140309_221503.jpg Photo by soloxp | Photobucket
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Old 03-11-2014   #18 (permalink)
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Default Re: two 4" or one 6" Port for 2 x12

Quote:
Originally Posted by soloxp View Post
Well, here the box...I was going to try to make the port flare but did have time. Also I ended up getting the SAZ-3500D over the Crescendo BC3500D cause it was going to be another 2 weeks to get the amp.

Also got this battery (Sears.com)... [email protected] they drop the price again need to go back and get's soom money back. This will be the sec time.

IMG_20140301_192936.jpg Photo by soloxp | Photobucket

IMG_20140309_221503.jpg Photo by soloxp | Photobucket
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Old 03-13-2014   #19 (permalink)
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Default Re: two 4" or one 6" Port for 2 x12

Thanks 666WMD...

Well got the sub's and amp in... [email protected] these sub's get low and loud. I'll try and get a video up this weekend. Thank you guy's for the pointer's. Still need to put the battery in. My 5 yrs old redtop is holding up ok
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Old 03-13-2014   #20 (permalink)
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Default Re: two 4" or one 6" Port for 2 x12

Nice man. Hope your happy with your sundowns as i know i am! they are built like f u c k i n g tanks!
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Old 03-16-2014   #21 (permalink)
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Default Re: two 4" or one 6" Port for 2 x12

Here is the video....

It's my first video ever on YouTube, camera not so good. Have to do some clean up work. And still have to put the back set in and hook up the battery.

2 Sundown X 12 - YouTube

Last edited by soloxp; 03-16-2014 at 09:09 PM.
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Old 03-16-2014   #22 (permalink)
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Default Re: two 4" or one 6" Port for 2 x12

Yes sir just as suspected them sundowns are brutal. Bet ot sounds hella good on tje cab. Good work representi.g the žUNDOWNž
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Old 03-19-2014   #23 (permalink)
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Default Re: two 4" or one 6" Port for 2 x12

Why such a low tuning ? you'll loose output on most bass notes.
I'd rather tune my boxes to 32 Hz. It still gives me plenty lows, and everything else. I must say that I don't listen to slowed tracks regularly. some decaf from time to time. so 32 Hz is nice enough for me.
Good choice on sub and on port. 2 4" port have less surface than 1 6" : so you made the best choice, but I'm sure it's still not enough overall, but Enough to please you !!!
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Old 03-21-2014   #24 (permalink)
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Default Re: two 4" or one 6" Port for 2 x12

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Originally Posted by Notorious97200 View Post
Why such a low tuning ? you'll loose output on most bass notes.
I'd rather tune my boxes to 32 Hz. It still gives me plenty lows, and everything else. I must say that I don't listen to slowed tracks regularly. some decaf from time to time. so 32 Hz is nice enough for me.
Good choice on sub and on port. 2 4" port have less surface than 1 6" : so you made the best choice, but I'm sure it's still not enough overall, but Enough to please you !!!
I tune low cause I love the deeeeep bass, my TC-Sound 3000 (just got replace with the x 12s) that I had since 2006 was tune to 25hz, 27hz and 28hz. That sub play what ever I put on it. It was low and loud.

As for the sec part of the port...I didn't go with 2-4" or 1-6", I went with 1-8" port.
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