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Four 15's?


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djMINIoompa 
Copper - Posts: 125
Copper spacespace
Joined: May 01, 2004
Location: United States
Posted: July 23, 2004 at 11:47 PM / IP Logged  
I went to a local install shop for an opinion, and they said four 15's requiring about 2 cuft for each chamber cannot fit into a 99 cavalier. The customer doesnt want a wall or anything like that, but rather just a box to fit four 15's, has anyone tried this?
Ravendarat 
Platinum - Posts: 2,806
Platinum spacespace
Joined: February 23, 2004
Location: Canada
Posted: July 23, 2004 at 11:49 PM / IP Logged  
Its totally doable if you build the box inside the car. I did 4 12's in a box that was chambered and each sub got its own 2 cubic foot chamber and ported. I know for a fact that if I had built it a little different 15's deffinatly would have been possible.
double-secret reverse-osmosis speaker-cone-induced high-level interference distortion, Its a killer
djMINIoompa 
Copper - Posts: 125
Copper spacespace
Joined: May 01, 2004
Location: United States
Posted: July 24, 2004 at 12:00 AM / IP Logged  
how did u build the box? as in like how were they facing?
It is better to remain queit and have others think u are dumb, then to open your mouth and remove all doubt.
Leif 
Copper - Posts: 71
Copper spacespace
Joined: July 15, 2004
Location: United States
Posted: July 24, 2004 at 3:36 AM / IP Logged  
How about Iso-Loading the woofers?
Iso loading will require twice the amp power, BUT it will cut the box size in half. You'll could do 2 cuft per pair (clamshell-mounted) and thus you'll only need a total of 4 cuft enclosure space for all four woofers.
I did this myself just a few days ago with four 12s - 1.7 cuft per pair, and it's working out great.
///Leif
Leif 
Copper - Posts: 71
Copper spacespace
Joined: July 15, 2004
Location: United States
Posted: July 24, 2004 at 3:37 AM / IP Logged  
Just to clarify, if you wanna google this, search for "isobaric".
///Leif
auex 
Platinum - Posts: 5,041
Platinum spaceThis member has made a donation to the12volt.com. Click here for more info.spacespace
Joined: December 23, 2002
Location: Arizona, United States
Posted: July 24, 2004 at 10:37 AM / IP Logged  
I had 4 fifteens in my cavalier, and my civic. I don't think that you will be able to get 2ft cu per sub. What I had was around 1.75 per sub and had the subs inverted, I also had adequate power. The box was around 30x36x12. As far as iso loading them, it is not worth it IMO.
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speedwayaudio1 
Silver - Posts: 879
Silver spacespace
Joined: March 18, 2003
Location: United States
Posted: July 24, 2004 at 2:26 PM / IP Logged  
I would not go "iso". It will give you room for 4 15's, but the sound will be like only 2. look on "woofer enclosures" on this site and it will tell you every thing you need to know about "isobaric". I think you could build a 4 15 box for that car. just do your home work. What kind of subs are they, do they need 2 cf each. they might need just a little less. or the may need more so you might have to look at some other subs. The customer will need to know that with that kind of install he will lose his trunk. good luck.
Big Dave
Leif 
Copper - Posts: 71
Copper spacespace
Joined: July 15, 2004
Location: United States
Posted: July 24, 2004 at 3:28 PM / IP Logged  
You're absolutely correct that that 4 isobaric-loaded woofers is a 4 cu ft enclosure will sound like 2 of the same woofers in an 8 cu ft enclosure.
However, you may be forgetting that 4 of these woofers mounted normally in a 4 cu ft enclosure will sound like LESS than two woofers at the same frequency. As you add woofers to the same airspace, low frequency efficiency goes WAY down.
It all depends on what your goal is, miniloompa.
Do you want SPL (i.e. as loud as possible, who cares how it sounds?).. In that case, mount them in whichever sealed enclosure will fit (make sure they have separate compartments) and it'll certainly be loud :).
If SQ is of importance though, I still stand by my recommendation of iso loading. Low frequency extension will be absolutely incredible with those drivers. It won't be as loud as a conventional enclosure can be at high frequencies (over 60hz or so), but it will probably be much louder at low frequencies (under 40).
///Leif
Ravendarat 
Platinum - Posts: 2,806
Platinum spacespace
Joined: February 23, 2004
Location: Canada
Posted: July 24, 2004 at 8:58 PM / IP Logged  
By build inside the car I meant that the box has to be assembled inside the vehicle because he finished box will not be abled to be manuvered into the vehicle because of its size. It wont fit threw the openings provided. You can however take out the back seat and build the box in three pieces one piece holds two subs then the second piece would drop inthe back and the thrid piece would slide in after you take out the back seat. Takes lots of planning but can be done. And I guarentee that you can get 2 cubic feet per sub.
double-secret reverse-osmosis speaker-cone-induced high-level interference distortion, Its a killer
xxxvectra 
Member - Posts: 9
Member spacespace
Joined: July 21, 2004
Location: United Kingdom
Posted: July 25, 2004 at 3:59 PM / IP Logged  
when you say a "cavalier" what do ya mean? cos we got cavs over here but not '99 ones... who make them?
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