this is probley my up in coming system, i have a box for 3 12's and i'm going to fill it will three JL 12w6's and put a alpine V12 running them. Also in a different box i'm oging to have 1 infiity perfect 12 running off a alpine V12 5 channel and have the other four speakers running on the other 4 channels. would that osund good?

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191(3.1)V6 1992 Pontiac Firebird,K&N drop in filter, bosch patinum spark plugs, Pioneer reciver, kenwood 4x6's, sony xplod 6x9's, two kenwood tornado 12's with a 300 watt jenson running them, check it out at www.geocities.com/my_92firebird

 

why?

why would u ever need 2 differnet brands of subwoofers in your car. 3 10's and a 12, in 2 boxes? i dont see the logic. i dont mean to rain on your parade, but, WHY?

the jls might be a little much for a camaro, but someone in here put 4 12's in his car and loves it. i like my 2 tens personally. oh yeah, i wouldnt buy an ALPINE to push those JLs. use PPI or soundstream.

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#"

 

Dan's right. Never mix and match subs. The result is going to be a very unsmooth and un-natural sounding bass.

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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

 

so what your saying is i should use the same brand and same size, like use 3 12's and 1 15. or does the size matter in sound when mixing and matching

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191(3.1)V6 1992 Pontiac Firebird,K&N drop in filter, bosch patinum spark plugs, Pioneer reciver, kenwood 4x6's, sony xplod 6x9's, two kenwood tornado 12's with a 300 watt jenson running them, check it out at www.geocities.com/my_92firebird

 

As long as their specs are close enough to being the same, it wont matter if you use different brands. Especially if the speakers are of different size, that way you can get a cleaner fuller sound.

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'82 Firebird, dead stock, 9 bolt disc rear, over 200,000 miles and still going strong, more to come...
http://www.spinfrenzy.com/stingerssx...easures.html#4

 

All the same brand and same size. Even within the same brand, different sized subs are going to be very different in terms of their electromechanical parameters. Ditto for 2 different subs of the same size.

------------------
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

 

Ditto on the same size and brands.And who says not to use Alpine? Steven,you heard how those three 12's in my brother's car sounded like with that Alpine pushing it,remember? PPI,Soundstream,Orion,ALPINE,Kicker,all make good amps.Just get a good name brand with enough power to push the subs you want.

 

also using two boxes, the subs are going to be in different places in your car, the sound waves from them will interfere.

 

Actually, they won't. The sound waves at the lower frequencies are so large that any phase shift due to different box locations will be minimal. Wavelength=C/F, or (343.7m/s)/(80hz)= 4.3 meters, or 14 feet. So, if you put 2 boxes a few feet apart, the difference in length from one to your head vs the difference in length from the other to your head is minimal. When you also take into account that the interior of your vehicle is vastly smaller than the length of the 80hz wave, you see that reflection will play as big a part (actually bigger) than having two subwoofers placed away from each other.

This is basically the case because the wavelength is so much larger than the distance it is traveling. Even with all of the reflection within the car, the total distance traveled by the wave is drastically shorter than the wave itself, so it dies out before any sort of interference or cancellation has a chance to occur.

------------------
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

[This message has been edited by Jim85IROC (edited January 15, 2001).]

 

With my experience of about 20 different systems in my bird having the same brand is important and same size not as important. I currently have 3 12" pioneers but previously had 2 12" and 1 10" and there was no problem. The wiring can be tricky. Where are you going to put all the subs. That makes a big difference.

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1987 Firebird 2.8 more show than go. Still turns over 10' tires though.

 

if you learn anything from this board, damnit, learn to listen to Jim85Iroc. Every time i got a problem or simple opinion question, he answers.. and hes right. So all in all, do what he says because I PERSONALLY guarantee success.

dont mix match sub sizes

 

There are a few reasons why mixing subs won't work. Every sub has a very different frequency response. When you put two drivers together with different frequency responses, the result is an additive result. This means if both have a 3dB bump at, say, 100 hz, the result will be a 6dB bump. Subsequently, if say, 150hz has a 3dB drop off in each sub, you're going to get a 6dB dropoff. Point is, a pair of subs that both have a frequency response within a +/- 3dB range can have a potentially as bad as +/- 6 dB response.

In addition, if you wire the different subs in series, you get a pretty large EMF distortion. A speaker and a microphone are exactly the same from an electrical standpoint. They are both transducers, usually with a cone attached to a bobbin with a coil winding. A microphone works by moving from the compressions and rarefractions in the air. This causes the voice coil to move past a magnet, which induces a a/c voltage. Likewise, a speaker works by having an a/c voltage cause a magnetic field that pushes the voice coil (and therefore the cone) which results in the movement that creates your sound. Well, if you have 2 subs hooked up in series, and you push one (like a microphone would), the other would move in the opposite direction (like a speaker). This situation will occur any time the two speakers are not moving in EXACTLY the same way. By pushing on it, it basically makes as large of a difference as possible, but ANY difference will cause the EMF, which will result in distortion. Of course, this distortion changes the frequency response even more, so in addition to sloppy, inaccurate bass, you now have a very unsmooth frequency response.

So let's say you wire them in parallel. Now what you have is two speakers with different impedance curves. This has the potential to put a high strain on the amplifier if you have multiple low impedance spikes.

In either a series or parallel configruation, both speakers are going to get approximately the same amount of power. Because of this, your output will be limited by the weakest driver.

That's all I can think of right now.

------------------
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

 

damn you know what your talking about, but I"m saying what if i put three of the same subs in one box and one different one in a different box and ran two amps,1 to the three and another to the 1.

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191(3.1)V6 1992 Pontiac Firebird,K&N drop in filter, bosch patinum spark plugs, Pioneer reciver, kenwood 4x6's, sony xplod 6x9's, two kenwood tornado 12's with a 300 watt jenson running them, check it out at www.geocities.com/my_92firebird

 

In that case, you're not going to get even power to the subs. I prefer running all of my subs off of the same amp, or at least the same style amp. Running 3 off 1 and 1 off of another is going to be a tuning nightmare, and your output is going to still be limited. But, having subs in different boxes is not a problem as long as the boxes have exactly the same airspace. I always run my subs in separate chambers even if they're in the same box.

------------------
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

 

The first thing you have to consider when putting a stereo system in any car is this. Is the not only enough room for the box and is the box big enough, but is there enough space left over in the car for proper speaker performance. I have found through experience that two twelves are a perfect airspace performance fit in the f body. im not saying that anything else wouldnt work but running what your planning on running is just mixing too much stuff together. I have a friend with an 83 camaro and one orion xtr ten with a sherwood amp runnnin 600 watts to it and he hits 145 db. thats nothing to laugh at. so you see its not what you have its what you do with it.

good luck with it

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1983 CHEVROLET CAMARO
305 C.I.D.V8 BORED .30 OVER
HIGH VOLUME OIL PUMP
FLAT-TOP PISTONS
MILD CAM
3" CAT BACK EXHAUST W/ FLOWMASTER MUFFFLER
KEYSTONE CLASSIC WHEELS.
B&M RATCHET SHIFTER
STAGE THREE SHIFT KIT

MUSTANGS SUCK

 

145 dB with one 10"????????????