just ordered 2 15" Q's dual 1 ohm

[Dangerous10k 0]

I'm gonna have a box built next month its gonna be ported at either 32 or 33hz with 1inch thick mdf and will be around 5.6 to 6.2 cubic feet i got the bp option at they are dual 1 ohm i'm running a JBL GTO 1400.1 amp which will be wired @ 4 ohms to push 1200 watts rms until i down the road get get a different amp my question is

a. i kinda want to go with soundstream what model would you recommend and i would kinda like to run 4 ohms so i have very little distortion

b. i might not be able to fit a box that is 5.6 cubic feet or above if it is 1" thick mdf should i go 3/4 thick with 1" for the front part and some braces or 1" thick all the way around and make the port a little bit smaller than 12 sq inch per cubic feet so i can meet the recommended volume or should i just go sealed? I really want a ported box though although i got a friend that has a couple kove audio 15s sealed and they sound really good

also this is in a 04 mustang minus a backseat

I got a soundstream taruntual 4 channel coming in the mail 2 infinity kappa 6x9s later on im gonna get some infinity componets up front and put a kinetik battery/ 240 amp altenator in

[KU40 173]

is that 5.6-6.2 cubes before or after displacement? IMO, you're going to need at least 70 sq. inches of port. If that 5.6 cubes is before displacement or you can't give them enough port, I'd go sealed.

[Dangerous10k 0]

that would be 5.6 after the port do you think its really nessary for 1 inch thick mdf or do you think just the sheet that has the subs and the rest 3/4?

also what kinda power handling will it have with say 5.7 ported compared to 5.7 sealed?

like if you build the box to max specs how will the power handling be compared to the min specs?

[manbeer 0]

Any of the new Soundstream amps i wouldn't bother with. They are nowhere near the quality of the originals that earned them the reputation the had, or of many of the other amps on the market today

If you want a beastly pair of amps and are looking to stick to a class AB, maybe try 2 of the RF T5002. You can find them floating around as refurbs for like 220-250 each and they would put down a nice 1000-1200 rms into a 2 ohm load bridged

If you want to go class D, an SAX2000 would be a perfect mate for the pair @ 1 ohm

To get the kind of power you are looking for at 4 ohms, you would either need a gigantic class A/AB amp, or one like the JL/Alpine PDX which won't really be enough to move the subs the way you want from what i have seen.

[Dangerous10k 0]

i think i'd be able to meet the minimum recommended ported box so sound wise 5.6 cubes ported @ 32hz vs max sealed 5.2 cubes how will it sound different I know the ported box would be a lot louder but what will be deeper, be able to hit more notes etc?

[audio-neon 34]

i think i'd be able to meet the minimum recommended ported box so sound wise 5.6 cubes ported @ 32hz vs max sealed 5.2 cubes how will it sound different I know the ported box would be a lot louder but what will be deeper, be able to hit more notes etc?

Have to reinstall my winisd pro :/

Still too many variables to give you a conclusive answer though, and none of us know how this subsystem will interact with the transfer function of your vehicle. Theoretically the ported box should be more efficient, in the case of maximum sealed volume, vs minimum ported, you will see that the sealed box will have a more linear output, deeper is also an opinion but I would bet that would go to the ported set up. This is all estimations though, I can't just pop in the #'s and get a decent graph for response at the moment.

Either way you will love these subs, they are known for their impressive output especially down low.

[Dangerous10k 0]

We'll I see from Port calculators that in order to have the required 12 square inches of port per cubic feet i would have to raise the tuned freq up to 34 hz or lower to less than 12 square inches of port per cubic feet pro's and cons needed, Now maybe the Port could be Folded to achieve 32 hz I dont know im not a enclosure builder

what is the pro's and cons of 32hz (which is what you recommend) vs something higher like 35hz? With 35 hz is there gonna be certain notes im not gonna hit or are low notes just not going to be as loud vs 35hz

I noticed the BL's are rated 32hz to 37hz what is the difference between it and the Q that make it's recommended tuning freq higher than the q? or maybe I should just skip all these complications and go sealed but I really want ported correct me If I'm wrong but doesn't the tuned freq have a 6db boost?

Edited February 21, 2009 by Dangerous10k

[Dangerous10k 0]

Noone is puttin in there 2 cents

[KU40 173]

Larger boxes have greater efficiency than smaller boxes, whether it be ported or sealed. So 6.7 cubes will be louder than 5.7 cubes with the same power (provided mechanical limits aren't reached). However, the tradeoff is lower power handling by larger boxes because they can't control the cone as well. So while the 5.7 cube box may be able to handle 1000 watts, the 6.7 cube box may only be able to handle 900. Then there's the issue in difference in sound, both tonally and in response. Larger enclosures have a more flat response curve.

Sealed boxes can generally play lower than ported because subs unload below tuning in a ported box. However, also generally, ported boxes are louder in the 30-50 hz range. But the sealed boxes are louder below 20-25 hz. So for most people and their music, ported will belt out the lows better, because the lows in most music isn't any lower than 30 hz.

[Dangerous10k 0]

well its gonna be getting pushed by 1200 watts rms I got the bp power ones will that be good for daily or is 1200 watts not going to push it to its potential? this is pretty much just for daily so I want these subs to last

Amp is a JBL GTO 14001 claimed to put out 1200 watts @ 4 ohms and 1500 watts @ 2 ohms subs are dual 1 ohm does this amp really put out this wattage it is CEA compliant or do you think this is an inflated number?

[mjmarovi 8]

I just ordered two 15 Q's with bp power as well, My box is ending up at 7.2 cubes after port, mounting woofers invertedly so that I don't lose out on displacement, tuning is 32.5hz. I will have ~13 sq. in. of port per cube of Vb. Pushing them with a crunch gp3000d-pro, backed by a kinetik hc2000, and hc 1400. Really, if you are looking at between 5-6 cubes, you are probably almost better off with 12's, when I was talking with Scott about tuning for my box, my first design was smaller, and on the low-end below 35hz, the numbers showed 12's playing louder in the same box. The 15's would still be louder higher than 35hz, so I went back to the drawing board and added a bit of Vb to come up with the 7.2 after everything. 32,33 hz no difference really.

About running at 4 ohms, it really doesn't matter, clean power is clean power, trying to run at 4 ohms is most likely just going to end up costing you more for the amps. yes, amps are going to be more efficient at 4 ohms, but no matter what you need the electrical to back what sounds like for you a total of 2400rms.

I have had a 15" Q with bp power before, had it at 4.8cuft tuned to 28hz on a fosgate 1001bd, it sounded awesome and absolutely crushed the lowest of the lows. I then built a sealed box later on to see how it would sound, still hit every low note, just sounded a lot cleaner, and not as loud. with the amount of space it sounds like you have, you may just like a sealed setup. I don't think those 15's are gonna hit the lows like it sounds like you want with a smaller ported box.

this is just my experience and what I have gathered from reading and learning from others that also have experience with Fi woofers.

[Dangerous10k 0]

Yea basically 6 cubic feet is about as big as i can get without sacrificing my trunk we are talking about where the backseat of a mustang used to be but what i was thinking was having external ports like holes on the side so i can get the full 6 cubes what's the most rms power recommended for daily driving?

[Dangerous10k 0]

I'm only pushing 1200 watts rms @ 4 ohms by the way, amp is a JBL GTO 14001

Edited February 24, 2009 by Dangerous10k

[Dangerous10k 0]

One more question (i already got 2 15s on order) how would 1 15 ported @ 4 cubes @ 32 hz sound vs 2 15s sealed at 5.2 cubes subs have bp power amp would push the 1 to 1500 watts at 2 ohm or the 2 to 1200 watts @ 4 ohms (1500 watts sound's like its pushing it) anyway the 2 would have more output sealed I would imagine right or no?

[mjmarovi 8]

600 a piece is SO WEAK FOR THESE SUBS although that would sound great sealed, your output wouldn't be much at all. 1500 is just fine for a Q with BP power as long as it's clean power. I will be running at least 1500 to each of mine. Hard to say which would be louder, although it's obvious running the two 15's would be more cone area, more power in a much more sensitive box it's really hard to tell. I think for the single ported woofer you could probably build a box that would be louder, but only for a small range of frequencies, ex. spl burps. building the ports so that they don't take up box volume is a great idea, just wasn't really an option for me in my build. anything you can do to gain Vb is going to help.

1500 rms is really the most recommended from what I have seen to run these woofers on a daily basis.

IMO the only problem you may have, is that because of the smaller box size you will lose some spl on the low-end but be just fine on the higher freqs. (low being below 36hz and high being above 40hz) To me above 40hz is a higher freq. for woofers.

It sounds to me with amount of space you have and amount of power, you would have been better off with two 12's or one 18. That's just my opinion.

[Dangerous10k 0]

yea i think im gonna go sealed though first off Im gonna wait for a while and sound deaded the car =( subs will be here monday

[diablo_331 23]

y not try a few passive radiators? they are fairly cheap.and not many people run them

[Dangerous10k 0]

I have a question actually with these two subs, i have two infinity 6x9s (not hooked up yet) and im looking at gettin a set of infinity componets i want lyrics to be really loud and bass not to totally overpower it so im thinking about having a custom door panel done what am i looking at to get everything to sound loud without treble bass or midrange overpowering 3 sets of componets 2 sets of componets? my 4 channel is a soundstream tarantula that "puts out" 105 rms x 4 at 2 ohms which is what the infinity speakers impedence is

[Dangerous10k 0]

alright im still debating on what kind of box to get and the installer is saying that if he goes with 4 cubes after the port with a huge port so its like 5.6 with the port that it will still be way louder than a sealed box true of false (w/2 15s)

[mjmarovi 8]

true, but only on the high frequencies, then you would lose major db's below 40hz. get two sets of the infinity's, will run cleaner, better to have 2 sets properly power IMO than 3 just trying to be louder, I'm running two sets of mb quarts comps in the doors off of a fosgate p450.4, amp tested to 96 rms X4 at 4 ohms, and the speakers love it loud and clear , and keep with the two 15 Q's just fine, of course this week the 3-way active setup goes back in so that should center the stage quite nicely and give me that much more. for just a loud daily beater though, two sets with that amount of power should be perfect.

[Dangerous10k 0]

According to WinISD I figured i could get 5.4 cubes after the port and it is at least 4 dbs from 23hz on all the way up to to the cutoff than a sealed so ive decided im going ported

[mjmarovi 8]

yeh man let us know how it works

[Dangerous10k 0]

To the guy that said something about passive radiators where do I find some online the only ones i've seen is those Audiopulse ones and it sure as hell seems not cheap to me according to Winisd i would need like 3 or 4 of them thats what 300-400 dollars not to mention all of them gotta fit inside of my car

Anyway I talked to a guy about building a custom box He said he could make the box big like 7 cubic feet but it will go into my trunk partially (this is gonna be a non walled box that replace's back seat going partially into the trunk my question is anyone with box's replacing backseat should I go subs firing towards the seats port towards roof or the other way around also If I got into a wreck do you think the subs would still stay in the box if it was towards the seat cause thats the last thing I would need in that situation would be gettin hit in the head with a 35 pound woofer lol

so im looking at somewher around 6.5-7 cubes @ 33 hz after displacement

Sorry for bringing this topic up but I want it done right when I'm shelling out like $500 plus for a box

[DUlrich1227 0]

Any of the new Soundstream amps i wouldn't bother with. They are nowhere near the quality of the originals that earned them the reputation the had, or of many of the other amps on the market today

have you heard the new .ref line from SS ?? From what i understand it is the original engineers that recreated/reworked them... I have been waiting for my local car audio retailer to get them.. hopefully sometime next week