Two Fi Q 15"

[MikeMartel 64]

Well, it seems that i will be getting these subwoofers a bit quicker than i thought.. Haven't order them quite yet but i decided that getting a ported box design ready couldn't hurt.

Trunk Dimensions: Height = 19" (So i was thinking box should be around 17.5" maximum)

Width = 36" (Narrowest point near the back seats)

= 47" (More towards middle of trunk)

Depth = 36" (Need room for battery, amplifiers, ect.)

Now iv never dealt with Q's before so im not really sure what i should tune the port for.. It says anywhere from 28-33hz, now i listen to all types of music so i was thinking maybe in the middle? Like 30-31hz?

I kinda wanted to design the box on my own, but considering its my first ever build... ill take the help and not make everything sound terrible ^^..

Thanks for the help!

Edited August 4, 2011 by MikeMartel

[altoncustomtech 773]

That's a lot of volume available, plenty for a couple of 15's ported. The problem I see with the available measurements is that you won't be able to use a slot port enclousre IMO. The 15" subs will have use ~31.5" width side by side and you only have 34.5 width inside the enclosure. That leaves you with only 3" available for port width and at 17.5" enclosure height max (16" inside) that's only 48sqin of port area and just not enough for a pair of 15's to me. You'll likely need to look at using Aeroports or slide the subs to each side of the enclosure and use triangle shaped ports at the top and bottom between the subs, maybe.

Otherwise I like 32hz tuning on the Q's myself.

[MikeMartel 64]

May be harder than i thought...

But Triangle Ports sound very interesting..

If i could pull that off i think it could be pretty sweet..

Edited August 4, 2011 by MikeMartel

[MikeMartel 64]

Well.. iv decided that 2 15"s may be a little to tight the way that my trunk is designed... Im going to stick with one 15" Fi Q for the time being, and later on when i have more experience ill try to fit another one in . Thanks for helping me out Alton.

[orlando144 20]

That's a lot of volume available, plenty for a couple of 15's ported. The problem I see with the available measurements is that you won't be able to use a slot port enclousre IMO. The 15" subs will have use ~31.5" width side by side and you only have 34.5 width inside the enclosure. That leaves you with only 3" available for port width and at 17.5" enclosure height max (16" inside) that's only 48sqin of port area and just not enough for a pair of 15's to me. You'll likely need to look at using Aeroports or slide the subs to each side of the enclosure and use triangle shaped ports at the top and bottom between the subs, maybe.

Otherwise I like 32hz tuning on the Q's myself.

If he makes the box subs up port back...he can make the port along the bottom of the box so he really has alot of port area to work with.

[bakedboy08@yahoo.com 6]

yep i agree with orlando, if you do subs up port back using areoports then you can fit 2 15's easily, then you wont have to worry about box heighth and you can put alot more ports facing the trunk. id go for the 2 15's

[jonbearsmt 919]

2 12's will be louder.

[MikeMartel 64]

By all means if you guys can help me out with 2 15's- go for it! i just cant figure a way to do it, Id love 2 15's ! Please help me out

[bakedboy08@yahoo.com 6]

so what exactly are your dimensions that you can fit a box comfortably, maybe 2 12's would be better, but what are your max demisions

[MikeMartel 64]

Dimensions are up top, but its midnight here and my gf wants to go to bed, ill check up on my thread in the morning.

[orlando144 20]

Box would kinda be on the smaller side but i think it would do fine. im running 2 15" Q's myself in a smaller box than recomended...did 148.1db. But 2 12's dosn't sound bad...

[orlando144 20]

^^ and not saying you will pull high numbers even with a smaller box but just as an idea.

[jonbearsmt 919]

Box would kinda be on the smaller side but i think it would do fine. im running 2 15" Q's myself in a smaller box than recomended...did 148.1db. But 2 12's dosn't sound bad...

pics?

[MikeMartel 64]

Orlando it says you have a 7.2 cubic foot box.. Thats within the specifications on Fi's website.. It says 2.8-4 cubic feet per subwoofer. Did you see how much cubes my setup would be if they were firing up?

[orlando144 20]

Orlando it says you have a 7.2 cubic foot box.. Thats within the specifications on Fi's website.. It says 2.8-4 cubic feet per subwoofer. Did you see how much cubes my setup would be if they were firing up?

but that is before port displacment... Its really around 3 cubic feet net for both subs. And let me look more into your dimensions...

[orlando144 20]

Pics of my box...

[orlando144 20]

And subs just for the F... of it..

[orlando144 20]

Box would kinda be on the smaller side but i think it would do fine. im running 2 15" Q's myself in a smaller box than recomended...did 148.1db. But 2 12's dosn't sound bad...

pics?

Pics posted.

[orlando144 20]

ok so for a box i got some dimensions ...

Width=35 inches (To give you some room to work with from the narrowest part of trunk)

Height=17.5 inches

Depth=25 inches (But you can add more if you want...)

Box Volume=7.289 Cubic ft Gross

Port Dimensions:

Width 33.5inches

Height=3 inches

Length= 30.38 inches

Tunning Frequency 31hz

Hope this helped a little.

And what kind of car do you have? trunk opening will factor in too...

[MikeMartel 64]

i had subsam design me like a 8 cubic foot box for my trunk for an 18.... so idk why this is being so difficult.

Iv got a chevrolet impala

And TBH you can make it wider than that.. I really dont want to be putting both of them in there if i cant get the right box size.

Edited August 6, 2011 by MikeMartel

[orlando144 20]

Ohh alright. 8 cubic feet will wourk out way better. And an 18 wouldnt be bad for an impala.

[MikeMartel 64]

Well not that i really want an 18 Q.. im just saying thats about the same cubic feet that 2 15's would take.. Ill ask subsam whenever he gets online next

Edited August 6, 2011 by MikeMartel

[NB50 206]

ok so for a box i got some dimensions ...

Width=35 inches (To give you some room to work with from the narrowest part of trunk)

Height=17.5 inches

Depth=25 inches (But you can add more if you want...)

Box Volume=7.289 Cubic ft Gross

Port Dimensions:

Width 33.5inches

Height=3 inches

Length= 30.38 inches

Tunning Frequency 31hz

Hope this helped a little.

And what kind of car do you have? trunk opening will factor in too...

Do not use this box for 2 15" Q's. It is way to small, after port and sub displacement it will be 4.8ft^3 @ ~37hz.

[MikeMartel 64]

Now this is a box subsam made for me when i thought i was all epic and wanted a 18" BTL N2..

Now with taking those measurements... would i be able to just adjust it a bit for 2 15's instead?

And yea i hear ya its too small

[orlando144 20]

ok so for a box i got some dimensions ...

Width=35 inches (To give you some room to work with from the narrowest part of trunk)

Height=17.5 inches

Depth=25 inches (But you can add more if you want...)

Box Volume=7.289 Cubic ft Gross

Port Dimensions:

Width 33.5inches

Height=3 inches

Length= 30.38 inches

Tunning Frequency 31hz

Hope this helped a little.

And what kind of car do you have? trunk opening will factor in too...

Do not use this box for 2 15" Q's. It is way to small, after port and sub displacement it will be 4.8ft^3 @ ~37hz.

Yea it is small but fitting a bigger box will be a little more difficult to fit through the trunk opening? Thats why i kinda went smaller & frgt to factor in port dicplacment () hehe