Enclosure Question (yea seems like theres alot of these)

[Dangerous10k 0]

Here is the Max Dimensions im working with

Height 1 18.5"

Height 2 23"

Depth 17.5"

Width 38.5"

2 15" Q's

I figured out if I got with 65 square inch of port (which is only 10.8 per cube) I would have 5.6 cubes internal volume @ 32hz will this be alot louder than 5.2 cubes sealed?

I could go with external ports and make it something like 5.8 cubes maybe, Box will be gettin done next week and I'm freaking out cause I want it to be loud

Do you think sealed these two 15's will still be alot louder than my old 2 12's Kicker CVX's in a 3 cube ported to about 34hz?

I'm gettin a headache just thinking about it

[burton907 0]

Here is the Max Dimensions im working with

Height 1 18.5"

Height 2 23"

Depth 17.5"

Width 38.5"

2 15" Q's

I figured out if I got with 65 square inch of port (which is only 10.8 per cube) I would have 5.6 cubes internal volume @ 32hz will this be alot louder than 5.2 cubes sealed?

I could go with external ports and make it something like 5.8 cubes maybe, Box will be gettin done next week and I'm freaking out cause I want it to be loud

Do you think sealed these two 15's will still be alot louder than my old 2 12's Kicker CVX's in a 3 cube ported to about 34hz?

I'm gettin a headache just thinking about it

as far as 2 15's getting loud then 2 12s.

yes your Q's have a much higher chance of getting louder then 2 12's. but that is all enclosure dependent. as far as your enclosure problem, i got nothing smart for ya.

[Solid_State13 1]

5.6 doesn't sound like a lot of room, but its within the recommended ported box size from Fi. But you should probably not seal off the trunk (if its going in a trunk car), which would give you less volume. I'm assuming that you factored in the volume of the port, and did you account for bracing?

I would say try them sealed first before trying to cram them into a ported box. You could also try running just one in a bigger ported box.

but if you are just concerned about loudness, why dont you get the BL? You could easily do 2 12's ported in that space and the BL's are designed more for SPL.

[Dangerous10k 0]

I already got 2 15" Q's dual one ohm, This is going into a Mustang which is replacing the back seat yea thats what I was thinking the installer was trying to talk me into doing a wall but I dont really want to do a wall, maybe I should just go sealed

5.6 was including woofer displacement port volume not factoring in bracing, So I think Sealed it is I should be able to easily do 5.2 sealed after displacement bracing etc

[Dangerous10k 0]

Sorry to keep beating on the dead horse here but One last time I want to get everyones opinion here box time is Friday so 1 15" Q in a 4 cube Box Ported @ 32 hz with 64 Sq Inches of Port Area vs 2 15's Sealed in a 5.2 Cube Box

1 15 Q would be Recieving 1500 Watts of power @ 2 ohms

2 15 Q's would be Recieving 1200 watts @ 4 ohms

They Both have BP Power

can 1 15 Q handle 1500 Rms daily in a Large Ported Box?

I just want to get some more opinions and I'll make my decision and leave you guys alone

Which will be louder?I'm thinking about going sealed cause it will sound significantly cleaner and I wont be pushing the Subs to the limit or the amp to the limiti that way

Also another question does the amp still draw the same power in a 4 ohm load as it does in a 2 ohm load? Let me rephrase that does it tax the electrical system the same regardless of the impedance it runs at?

[BKOLFO4 29]

Is that 1200 watts for the pair (600 each)? What amp do you have that does 1200 watts at 4 ohms and only 1400 at 2 ohms?

I have done the 1 driver ported vs. 2 drivers sealed comparision with several systems. . .

The last one I did was (16) 10's sealed vs. (8) of the same 10's ported. 3200 watts on the 16 drivers, 1600 watts on the 8 drivers (200 watts to each speaker in both setups).

I would take the (8) 10's ported any day for daily music and loudness. (16) 10's was not quite as loud, but had better REALLY deep bass (I had dolby digital in the vehicle, and the 16 sealed drivers did better with some movies). That was also because I did not run the SSF with the sealed setup.

As far as sealed being so much "cleaner", a correctly designed ported box will sound awesome.

Most amps come close to doubling their power going from 4 to 2 ohms, and also become less efficient. If an amp does not make as much power it will not be as hard on the car's electrical system. If your amp in fact makes 1200 watts @ 4 ohms and 1400 @ 2 ohms, you will not see much difference.

Brian

[Dangerous10k 0]

its a JBL GTO 14001 I take it the BP power will handle 1500 rms in a large 4 cubic feet box? my subs are dual 1's so w/ 1 the only option is 2 ohms and 2 the only option is 4 ohms

Edited March 11, 2009 by Dangerous10k

[BKOLFO4 29]

4 ft^3 is not really large for a Q 15. Sounds just right.

1 ported would be my vote. As long as the box design is correct it should be ok on that amp (not that user error could not still destroy it). Also - It does not look like that amp has a subsonic filter. You could get the 20 Hz HP F-Mod and put in line on the RCA.

Brian

[BKOLFO4 29]

Started thinking about those (16) 10's and had to post a picture. . .

[Dangerous10k 0]

what was it powered off of?

[BKOLFO4 29]

Opti4000D. Nice amp. They were even nicer when you could get reburbs direct with 2 year warranty for $680. Now it is $902 with 1 year warranty.

[Julian 641]

if you added universal (like i did) im adding another BL to my system sometime soon and im going to wire the two d1's like so.

if your amp can handle 1ohm than youre good, you could always go with a crunch or hifonics amps which are pretty good for the price.. about 160 for 1200 watts rms or so at 1 ohm

[Dangerous10k 0]

I have a Q it dont have an option for universal and i have the JBL which is rated at 1500 at 2 ohms im thinking of gettin a second one and running one each sub at 2 ohms

[Dangerous10k 0]

Alright Finally got the setup up and running

Box is Gross 9.5 cubic feet with 1.5 cubes of port .38 cubes of displacement

7.62 cubes @ 33 hz off 1200 watts wired in a 4 ohm load

I noticed they have some polyfill in this box for whatever reason. (i didnt build it) This would be a nightmare to calculate I would think, because the box is like a Trapezoid with another slanted chamber going into the trunk.

Box replaces where the backseat used to be subs firing towards seats port firing towards seats. Subs are probally aoubt 2 feet away from you're head. (sorry probally not all that impressive to alot of people on this forum but, I'm really impressed, and it definately destorys anything I have ever had by far)

Off 1200 watts this thing shakes the steering wheel even when I got my hand on it.

2 infinity kappa 6x9s and 2 infinity 6x8 reference componets off about 60 watts rms each

deck is a clarion

Sounds pretty sick, woofers probally have maybe 45min to an 1 hour of play time same with speakers.

Sounds so clean compared to the Kicker CVX 12s I had before definately way louder in the low's. Compared to when my kickers were in a prefab 3 cube box, I would say they were louder in the high notes in that box, but I'm sure it was probally tuned really high.

The real big difference I would say is that these Infinty's sound way better than my old polks in my opinion they just sound way louder overall

I'm really interested to see what I would hit on the termlab. I have a Soundstream 7 band Parametric EQ I havent hooked up yet. and I have a Soundstream 4 channel coming soon. Soundsteram TRX 4.420 rated at 105 watts rms @ 2 ohms (which is what the infinitys run at) Can't wait cause its got, a bunch of filters this cheap sony dont 24 db cutoffs.

Here is one question though 4 channel cutsoff at loud volume, turn the car off then back on again and it is instantly back on. Any Idea's? Im thinking it probally isnt very stable at 2 ohms instead of 4 like I used to run

Edited April 2, 2009 by Dangerous10k