AQ 15s and port questions

[netzero 10+ year member]

Will two AQ SDC2.5 15s off a AQ1200D work well in a 9 cube box? Also, would three 4" Aero ports be enough for these? Quick one on round ports... When i do 3.14 x 4 x the length that the port calc game me (5.2") and do three of those i get a total of 0.113388 ft³... Thats a lot less displacement then a slot to tune the same box to 36 Hz. So is that a plus of Aeros, that they waist less space? Does 3 4" wide aeros 5.2" long sound about right? Thanks

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[bhsdriller 10+ year member]

what size subs? i'm guessing 15's

 

[Millertime1028 10+ year member]

You would be better off doing (4) 4 inch ports or better yet (2) 6 inch ports .. And 9 cu/ft would be more then enough. YOu would have roughly 56 inches of port area with tuning of 36 . Port length would be 9 inches for the 6 inch ports

 

[netzero 10+ year member]

Ya sorry, I thought i added, they're 15"s. 4 4"s or 2 6"s? That would be better?

 

[spencer321 10+ year member]

2 6" would be better, however a single 8" sonotube with some creative router flaring would be best, with round ports its ALWAYS better to go as big as possible as opposed to mutiple smaller ports because of surface area.

4 x 4" has more surface area than 2 x 6" and 2 x 6" has more surface area than a single 8" sono tube.

btw, 9 cubes at 36hz with a 8" sono tube would be 5.75" long, but you could be a real bad *** and run a 10" single sono tube for a port, which would be 78.5in^2 of port and would only be 10.75" long which is still a short port.

 

[Notloud00 10+ year member]

u cant get an 8" sono tube. the one i bought was 8.5" which is a big as two 6" ports

 

[spencer321 10+ year member]

u cant get an 8" sono tube. the one i bought was 8.5" which is a big as two 6" ports

maybe different brand? my home depot has sono tubes from 8"-12" in 2" increments. now that inner diameter and not outer (yes i had a tape measure with me) and yes, an 8" an 2-6" are almost the same, except the 8" has less surface area which was the point i was trying to make. 10" would be alot cooler tho, 10" port thats rediculous

 

[Notloud00 10+ year member]

my said 8 but it was 8.5 internally:crap: ****ed up my box plans and tuning:furious:

 

[spencer321 10+ year member]

oh the ones we have, its not sonotube the brand but its the same **** thing, the are 1/4in thick, so its 8.5 external and 8 internal, same goes for the 10 and 12

 

[netzero 10+ year member]

Ok, so in a round port you want as much surface area as possible within tuning, with the least amount of surface area to reduce turbulence? Also, what is this sonotube made out of? Is it just over sized PVC pipe? And you said you can flare it with a router? How does that work? Thanks

 

[Notloud00 10+ year member]

it is a very very light weight cardboard. idk bout the router part because i do not own one.

 

[spencer321 10+ year member]

Ok, so in a round port you want as much surface area as possible within tuning, with the least amount of surface area to reduce turbulence? Also, what is this sonotube made out of? Is it just over sized PVC pipe? And you said you can flare it with a router? How does that work? Thanks

backwards you want the LEAST amount of surface area, less friction, less drag i don't know how else to put it. a single larger port will have less SURFACE area in the port than 2 medium size for instance

2 6's have about the same PORT area as a single 8

but a single 8 has less surface area in the port itself.

and for icweiner, they are not as light light or thing cardboard as you think, lots and lots of the home theatre guys will take a 18-24" sono tube and cut a baffle for either end and use the tube itself as an enclosure for their subwoofers, and i've seen mutiple sonotubes with big 18" drivers, IXL 18's, dayton titanic 15's... my point is they are beafier than you think but if you want the extra reasurance (i mean its just a port but suit yourself) you can take a little bit of fiberglass and reinforce the outside of it with a layer or 2 but i don't think its needed, its alot more solid than you think.

as far as flaring with a router here you go, its a system of a double baffle and flush bit and the biggest roundover bit you can find/use

http://www.subwoofer-builder.com/flares-10mm.htm

enjoy

 

[netzero 10+ year member]

Thanks spencer321, I got'cha now. So I can get these tubes at my local lowes? How would it sound on a box without a double baffle and no flare? Whats the biggest size PVC you can get? Do they make a 10"?

 

[Notloud00 10+ year member]

backwards you want the LEAST amount of surface area, less friction, less drag i don't know how else to put it. a single larger port will have less SURFACE area in the port than 2 medium size for instance
2 6's have about the same PORT area as a single 8

but a single 8 has less surface area in the port itself.

and for icweiner, they are not as light light or thing cardboard as you think, lots and lots of the home theatre guys will take a 18-24" sono tube and cut a baffle for either end and use the tube itself as an enclosure for their subwoofers, and i've seen mutiple sonotubes with big 18" drivers, IXL 18's, dayton titanic 15's... my point is they are beafier than you think but if you want the extra reasurance (i mean its just a port but suit yourself) you can take a little bit of fiberglass and reinforce the outside of it with a layer or 2 but i don't think its needed, its alot more solid than you think.

as far as flaring with a router here you go, its a system of a double baffle and flush bit and the biggest roundover bit you can find/use

http://www.subwoofer-builder.com/flares-10mm.htm

enjoy

they are light compared to pvc.... i never said it wasn't strong. in fact it is very very durable.

 

[spencer321 10+ year member]

PVC you can get up to 8 or 10inch i believe but its a special order online kinda deal, biggest ive ever seen in a home depot or lowes is 6inch. being that its 8" or 10" (i still say go with 10" port diameter.... #1 its beastly, and #2 11" long port is still a short port, and yes it should be at lowes, go look in the concrete area, these "cardboard" tubes are what they use to pour concrete pillars, so you can imagine they are pretty strong lol.