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System design help

Printed From: the12volt.com
Forum Name: Car Audio
Forum Discription: Car Stereos, Amplifiers, Crossovers, Processors, Speakers, Subwoofers, etc.
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=22663
Printed Date: May 19, 2024 at 6:25 AM


Topic: System design help

Posted By: caz25
Subject: System design help
Date Posted: December 10, 2003 at 4:48 PM

Hey I need some help designing a new system but I have a few problems.

I have a 2000 Honda Civic with a 75 amp factory alternator.  I am used to high spl in my other american cars but the Honda alternator is giving me trouble.

For my sub amp I will be installing either a Fosgate 800a2 (200 X 2 @ 4 ohms - 400 X 2 @ 2 Ohms) or a Audiobahn 1500HC (500 X 1 @ 4 ohms - 1000 X 1 @ 2 Ohms - 2000 X 1 @ 1 Ohm) **All RMS Ratings

My first problem is awhile ago I had the audiobahn amp connected with a 130 Amp alternator - of course in retrospec I obviously wasn't thinking about my actual amperage usage and melted my alternator. (I was powering 2 subs @ 1 ohm 2000 RMS - so I was using over 145 amps just for the sub amp.) **This was obviously dumb.

Now I am looking for some new subwoofers but I worried about powering them.  I would like to install the Fosgate and get 2 - 12" Dual 4 ohm Voice Coil Subs giving them 400 RMS each but that would use a constant of about 60 amps plus another 20 amps for my mid/high amp.  That's 80 amps and with a 75 amp alternator it doesn't take a rocket scientist to figure out there is a problem.

So I think I am going to have to get a new alternator but I don't want to screw with the distributor cap settings so I am thinking about buying 150 amp alternator, not too huge not too small.  But the cold rating is 70 amps which still isn't enough to power my desired setup.

Since I want high spl I want to know if you guys think it is possible to power 2 subs at 400RMS or would it be better to go with a lower wattage sub.

Now I spend so much money changing my setup I am not looking to spend a crap load of money on this setup so could you guys recommend some good spl subs that dont cost a fortune.

I would like some Eclipse Alums or JL Audio 12w6v2 but they are alittle costly for me as I just quit my job.  So Some lower priced ones I have looked at are Kicker VR's (400RMS), JBL Power Series (400RMS), or Fosgate HE2 (400RMS).

Anyone ever hear any Elemental Design Subs?

Any ideas?




Replies:

Posted By: EzekialPhoenix
Date Posted: December 10, 2003 at 4:56 PM
Check out Kicker L7 subs at www.thewholesalematrix.com  very affordable and they bang.

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I be tossin and flossin, my style is awesome. Causin' more family feuds than Richard Dawson.



Posted By: tdsteele
Date Posted: December 10, 2003 at 6:02 PM

Great bang for the buck sub would be Diamond Audio CM3 series. They handle 500rms each, have good sq and spl, and are priced very reasonable.

https://www.diamondaudio.com/MobileAudio/index.cfm?page=Subwoofers


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