After I receive my carpet this week I should hope to have it installed sometime before I go back to work from my vacation. Well I plan to Dynomat the entire car since I'm going to have the carpet out. I've got two 13ft. rolls which I think should be enough to do the entire car. If I have any left over do you guys think that it would be a good idea to overlap certain areas or would it be a stupid idea.
Ok now the technical side of it. I have 2 Aura 4150MRQ 600 watt RMS amps that I am going to be running. The speakers that I have selected are all Rockford Fosgate. I actually find this quite funny b/c for many years I have hated RF b/c their products were cheap quality and they just plainly sucked until I heard these new punch series. I have 5.25" component speakers that will be used as kick panels & four 12" Rockford Fosgate Punch HE2 DVC 400 watt RMS subwoofers. What I was wondering as to what type of box should I put them in? A sealed, bandpass, vented, or ported? The first thing that I'm going to hear is that it won't fit in my '86 Firebird but I intend to take out the rear seats so I will have lots of room. Does any one know as to what my SPL and DB hits would be w/ all that good sh*t? Are the db & SPL the same? All I know is that this system will be loud and bumpin hard. Hell who needs an engine I can just vibrate down the street. Thanx all

- Mike Harvey -

 

id really like to see your box plans for 4 12's in a camaro, thats insane, yer gonna be deaf in a month. since u seem sincere about your future plans, i would reccomend a sealed enclosure cuz u wont be needin any help from the box to hit the high db's. especially with the rear hatch acting as the best bandpass you can get. im glad to hear you have finally chosen RF as your product line up. i use rf products in my car as well and am very pleased with the sound. as for the amp, i have never heard of aura, are they good? who makes them? what country(it doesnt sound domestic) do they claim or prove those ratings? if they are good amps then you are well on your way to acheiving some very high decibals. i dont know how high, but anything over 150 and im sure you will be happy. GET A NEW CHARGING SYSTEM AND A CAPACITATOR AS WELL!!!!

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86 camaro cpe(dont laugh)has 92z28 body kit with GTS covers, new red paint and a killer stereo. 2 amps, 8 speakers, disc changer, custom install with subs coming by the end of the summer. sawpped (or in the process of) 305lg4 for brand new 350. TES headers, flowmaster cat back, performer manifold, TCI converter, jet chip, kn with dual snorkel cleaner. and she still passed the sniffer!

"Cal Poly SLO is the shi#"

 

Put them in a ported box. When you put the subs where the back seat is, your SPL (SPL is measured in dB) is reduced compared to putting it in the back. Using properly sized ported boxes will help compensate for that. I would expect your stereo to hit low-mid 140s with that setup, which is also attainable with 2 12s in the well because of the transfer function benefit.

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<A HREF="http://www.rit.edu/~jli4307/camaro" TARGET=_blank>
View the restoration of an 85 IROC</A>
"I didn't know a bored out Ford could go so slow" -Shenandoah

 

Heck yeah Aura's are a really good line. If you want to just find out some info for yourself on them go to www.aurasystems.com. They are a kick *** amp. I already have I installed w/ my current system and bought the other one about a couple of weeks ago. I already got my charging system setup on my Firebird so I guess all I really need is a capacitor then huh? Are there any problems do you think that Am going to be running into any problemswhen I replace the carpet in my bird or should it be pretty simple?

- Mike Harvey -

 

If the dynamat is the 13 square foot roll, your going to need ALOT more.. One of those was BARELY enough to do the entire rear well area.. If you want to dynamat your entire car, your going to need about 5-8 rolls of the stuff...

 

Jim,
Why a ported enclosue? Are you looking to get the boost back from not having the the subs in the well? I think having 4-12"'s would take care of that!

 

why even take out the back seat? in my camaro coupe, i have 2 15's, and the box is designed for either 2 15's or 4 12's. i'd go this way personally, just for the fact you keep the back seat. and like jim said, and has said in the past, subs sound better in the very back. now, i thought about taking the back seats out of my 91 rs convertible, but that due to the lack of space and because of the convertible top, losing it all in the air. just my 2 cents

 

Because 4 12s or not, it won't hit as hard as you think when it's in the middle of the car. I'll bet that he won't hit more than low 140s with the 4 of them in the middle of the car. I can do that with 2 12s out back, and my next box will do it with 2 10s. 2 10s as loud as 4 12s, just because of placement. I saw a 94Z with 4 15s and exactly double the power I had that couldn't hit for ****. Since I'm guessing that he's after SPL and not necessarily sound quality, a ported box will help him get extra output. I'd still rather see the 4 12s behind the seat there they'll actually get loud.

------------------
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<A HREF="http://www.rit.edu/~jli4307/camaro" TARGET=_blank>
View the restoration of an 85 IROC</A>
"I didn't know a bored out Ford could go so slow" -Shenandoah

 

Hey Camaro 22 how am I going to be able to fit four 12" in the rear hatch area? My biggest concern is to be able to take my T-top off and place in the rear. I didn't think that I would be able to do it w/ 4 12"'s back there I decided to rip the rear seats out.
Also Jim how am I only going to be able to hit 140's when I'm hitting in the 130's w/ 2 10"'s in a freeair box? Just curious. I would think that I would be at least in the high 150's. So I placed all of them in the rear area I could maybe be in the 160 or higher? I just need to know how this would work fitting 4 12"'s in the rear. Would I have to angle them and have them firing against each other or what? Thanx for all the help and if I decide to throw them in the rear should I only really Dynomat the rear section only and forget the middle and front of the car?

- Mike Harvey -

 

Also one more question. WHere would I place my 2 Aura amps at? Those things are huge.

- Mike Harvey -

 

Mike, in your first post you didn't even know what SPL was, and now you hit 130 with subs on a plate? That isn't possible. 130 from 10s in a box is absolutely believable, but not from a plate.

------------------
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<A HREF="http://www.rit.edu/~jli4307/camaro" TARGET=_blank>
View the restoration of an 85 IROC</A>
"I didn't know a bored out Ford could go so slow" -Shenandoah

 

i beg to differ jim, ,my friend is his 94 s10 truck hit 139 with a 75.2 mtx amp. he had 2 ten inch soundstream usa's(the bottom of the line ones). i was there with him and saw. hitting high dbs isnt hard, granted i have not visited as many "db drag races" as you have, i still maitain the belief that 4 12's in a camaro will acheive much higher than the 140's. but we will have to wait and see what MIKE posts when he gets this monster system together.

mike, a good place for your amps would be either in the compartment where your spare tire is or just put them on the box. since you are gonna build this very difficult box for 4 12's, i see no problem for you constructing an amp rack for those amps.

ps. im gonna take a look at that website. thanks

daniel

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86 camaro cpe(dont laugh)has 92z28 body kit with GTS covers, new red paint and a killer stereo. 2 amps, 8 speakers, disc changer, custom install with subs coming by the end of the summer. sawpped (or in the process of) 305lg4 for brand new 350. TES headers, flowmaster cat back, performer manifold, TCI converter, jet chip, kn with dual snorkel cleaner. and she still passed the sniffer!

"Cal Poly SLO is the shi#"

 

Actually Jim no disrespect but I didn't know the difference between SPL & DB until I went to my local car stereo shop and they explained it to me plus checked out the DB level of my current system. Depending on the placement of the mic on the dash it was hitting anywhere from 135-137 db. SO go figure. Ryan at the shop was telling me that he wanted to pyramid the subs downward toward the bottom of the car so they get the lowest possible db that they can. He said that he does not know for sure that if they will all be able to fit until the baffle and speakers are pulled out to see if he has enough space to fit them all there. Do you guys think that they will all fit in that type of box design. He was talking of making 2 seperate boxes for the woofers. Does this sound like a good plan.
He has always been honest w/ me and cool and sstraight forward about it. I'll find out in about a month when it all goes in, hopefully sooner.

- Mike Harvey -

 

As long as you trust your installer and he's spending the proper time explaining things to you, then I say go for it. Just don't be disappointed if you don't go a lot louder than what you have now. It's been my experience that you sacrifice at least 3dB by placing the subs behind the front seats instead of in the back, and generally you get a 6dB gain by doubling your subs and your power.

------------------
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<A HREF="http://www.rit.edu/~jli4307/camaro" TARGET=_blank>
View the restoration of an 85 IROC</A>
"I didn't know a bored out Ford could go so slow" -Shenandoah

 

I agree with jim on the placement thing... until recently, i had 5 subs in the back of my firebird. 2 12's aimed at the back glass in the well, and three tens closer to the middle of the car. While they were all getting enough power, and were all ported, and in a great box, the 10's didnt have anywhere NEAR the effect the 12's had. Thats actually why i took the system out, those 10's were basically not doing much. In fact, the 10's came out first, and you couldnt hear much of a difference at all, as the 12's off the back glass still provided the sound and the power that the whole system had. Im considering just going with 2 12' L7 solos for this very reason. Why waste all the space, if two 12's off the glass can accomplish the same thing?

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1988 Formula, 305TPI, 700r4(for now), headers, stage 2 PROM, modded MAF, cat back, no catalytics, cowl hood, centerline champ 500 rims, KOBEL predator ground effects kit, Trans AM tailights, dash pouch, 92 shift console w/indicator, white face gauges, accented red trim, 12 speaker stereo, 4 amps, tint, T tops... icq 44373460 AIM:admrlam
see it at www.geocities.com/admrlam/bird.html

 

One question though from you guys. Will all of those 12"'s be able to fit into 2 serpate sealed boxes in the rear hatch well? My installer doesn't know and he will have to wait until all of my current system is pulled out.
Another thing. Should I just concentrate on Dynomating just the hatch well and maybe double it up since I've got 2 13ft. rolls of it and not put any importance into the middle of the car? The main reason why I wanted to place the subs in the rear where the seats are at b/c I didn't think that I would have room in the well plus I didn't want to get new seats for the rear if they did fit b/c I am upgradin my interior to the 93-95' Z28 seats. Oh well it's only money right?

- Mike Harvey -

 

Here's a pic of the 4 12s in my firebird:

Please disreguard the brand name equipment
That box wasn't sealed (far from it) but it at least illustrates that there is room for that type of install. You don't need 2 separate boxes per-se. One box with a divider will be functionally identical to 2 boxes.

------------------
The IROC Homepage
<A HREF="http://www.rit.edu/~jli4307/camaro" TARGET=_blank>
View the restoration of an 85 IROC</A>
"I didn't know a bored out Ford could go so slow" -Shenandoah

 

mike, here is the box i was telling you about. it holds either 2 15's which i have there, or 4 12's. it is a sealed box, and actually sits down in the well too as the box most people have with 2 12's. hope this helps you somewhat.


here is my rear view mirror image as well.

 

Thanx guys for all your input but I just have one problem now. Where can I possibly place my T-tops at when they are off? Throw them in the back seat?
Well I will have about 1 month exactly before I have the system completely installed in my car. By then I should have all the interior enclosures of the hatch well and the answers that I need to the displacement issue to see if they would fit. Thanx

- Mike Harvey -

 

For now until I finish the system, my t-tops reside in the back seat. It's a huge pain in the *** , but just temporary. After the stereo is done, I'm going to be able to put the t-tops right over the stereo, or I may just put the forward facing hooks in and put them over the folded-down seat.

------------------
The IROC Homepage
<A HREF="http://www.rit.edu/~jli4307/camaro" TARGET=_blank>
View the restoration of an 85 IROC</A>
"I didn't know a bored out Ford could go so slow" -Shenandoah

 

Mike, you also might want to visit www.dynamat.com. They have some instructions there on how to best apply the stuff; it's worth looking at.

And about what Jim was saying about subwoofer placement...this might not be an accurate comparison, but...

I had one of MTX's cheapest 8" woofer in a little bandpass box in the bottom of the hatchback well, and after that big amp blew the sub a few times, I folded down the back seat and put a dual 10" bandpass box with two older, well-made Jensen subs in it. To be honest, one eight in the well made just as much bass as two tens in the back seat.

 

Well I've got a Direhard battery that is a year old and still kickin plus I have a 110 amp alternator. Don't know if that helps ya guys out on my statement from before.

- Mike Harvey -