whut to do with 2 fi q 15s?

[Jdub 0]

i have 2 15 qs and i was planning on putting them in a 08 honda accord, any suggestions on whut box to throw them in, ported?sealed? really not sure on whut direction to go with this

[mbarber25 29]

well are you going for SPL or SQ?

Edited October 17, 2009 by mbarber25

[Mac N Cheese 90]

we need more info to continue this topic

[jcarter1885 995]

i have 2 15 qs and i was planning on putting them in a 08 honda accord, any suggestions on whut box to throw them in, ported?sealed? really not sure on whut direction to go with this

Please read noob posting guidelines before posting again, this topic is useless right now.

[Jdub 0]

im lookin for sq with some lows, i came up with 25 depth 17 height 32 width, whut can i do with that?

[ppiflat10s 3]

well thats only 6 ft^3 sealed after sub displacement. if you try adding enough port area and a long enough port inside that box youll be just about right for only one sub ported. so youre basically stuck going sealed.

[mjmarovi 8]

barely enough width to even fit the subs on one faceplate. did you get the bp power option or no? they work a lot better sealed without the bp power.

[Jdub 0]

barely enough width to even fit the subs on one faceplate. did you get the bp power option or no? they work a lot better sealed without the bp power.

i got them with bp power whuts the difference?

[thebiggmann12 14]

Bp Power - This option adds a machined aluminum compression plug to the pole which helps channel all of the air under the dustcap around the coil for better cooling. To aid with this increased airflow we also add 6 axial cooling channels in the top plate. Along with increased thermal capacity comes the addition of an extra spider and a changed spider pack. All of these features increase power handling from 200-500 Watts depending on the application. 


[slim2fattycake 85]

barely enough width to even fit the subs on one faceplate. did you get the bp power option or no? they work a lot better sealed without the bp power.

why is that?

[mjmarovi 8]

barely enough width to even fit the subs on one faceplate. did you get the bp power option or no? they work a lot better sealed without the bp power.

why is that?

well, outter diameter of woofer is 15.625", so butting two up to each other makes is 31.25" and then you have the side walls of the enclosure. that's at bare minimum, 3/4" a side, or 1.5" total. in which the box I built for two 15" Q/s was double walled, braced, then fiberglassed on top of that and in all seems. so 32" is going to be a squeeze. you may have to stagger them slightly, so that they are not exactly side by side, just not sure how your install is suppose to "look" and where you will see the woofers in accordance with the vehicle.

[slim2fattycake 85]

i was asking about the highlighted part.

[mjmarovi 8]

barely enough width to even fit the subs on one faceplate. did you get the bp power option or no? they work a lot better sealed without the bp power.

i got them with bp power whuts the difference?

ok well the other gentleman described what the BP option is, but in stregthening the woofer, and the suspension, it takes away from some of the sealed ability of the woofer. Not saying it wont' work, it certainly will, and work well, just not as well as it would without it in a sealed. Generally speaking, you get the BP power option for daily ground-pounding in a ported enclosure. and no BP option for sealed setups.

as for box design. I would build a double baffle. if you can, add that second layer of the baffle to the outside of the box, making overall depth 25.75".

then add a brace or two for the width of the box, and other than that 3/4" MDF for the box build should be find.

for dimensions given, depth=25" height=17'' width=32" that gives you 6.43 cuft total space.

you can use a slot port, and with top and bottom plate, that would make port opening 15.5" tall. make the opening 4" wide, that gives you just shy of 12 sq. in. of port area per cubic foot of box volume. that 's what's recommended by Fi. make port length 20". this will give you a 5.58 cuft box after port displacement, and give you a tuning of 33.6 hz. and after woofer displacement and bracing, you will be closer to 5.2cuft, and tuning of ~34hz. and will have 12sq. in. of port per cube. it is on the small side, considering when I had a single 15" q, it had 4.8cuft after port and displacement just for itself, but gotta deal with what you have. Will still work great, but FYI, it will take a much larger box to really pound the lows like you might want to. but everyone's opinion of "lows" are different so you may be surprised of the output of this enclosure ~40hz range where most rap and hip/hop is played.