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mixed ohm subs


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93cavdemon 
Member - Posts: 31
Member spacespace
Joined: December 01, 2003
Posted: October 10, 2009 at 12:08 AM / IP Logged  
whats up 12volt, havent been around in a while but ran across a interesting problem. i feel as if i've ran into the problem im having once before but i need some quality reassuring advice.
im doing an install in my gfs 97 chevy tahoe i got 3 subs and 1 amp.
i have
1 4ohm dual voice coil kicker l5
2 2ohm dual voice coil kicker l5
and 1 ssl cr4000.1 amp
the amp is supposivally 4000watts max and is 1 ohm stable. the way i have it wire now is the 1 l5 that is 4ohm dual voice coil is wired at 2 ohm the other 2 subs that are 2ohm 2 voice coil are wired to each other for a 2ohm load. then i got the 4ohm sub tied to the 2ohm subs going into the amp.
the problem im having is that the amp seems to be gettin extremely hot theres cooling fans on the amp that arent turning on. my question is how would i wire every thing together to get a total of a 1 or 2 ohm load going to the amp.
haemphyst 
Platinum - Posts: 5,054
Platinum spaceThis member has been recognized as an authority in Electrical Theory. Click here for more info.spaceThis member has been recognized as an authority in Mobile Audio and Video. Click here for more info.spacespace
Joined: January 19, 2003
Location: Michigan, Bouvet Island
Posted: October 10, 2009 at 1:45 AM / IP Logged  
Supposedly, you can't do it correctly. You don't have enough drivers, nor do you have the proper number of drivers of the correct impedance.
The two 2-ohm DVC woofers can get you .5 (all paralleled), 2 (series-paralleled), or 8 (all series) ohm final impedance.
The one 4-ohm DVC woofer can get you 2 (parallel) or 8 (series) ohms final impedance.
While you can hit the one ohm target, with the series-parallel setup (2 ohm option) for the 2 ohm drivers, paralleled with the parallel (2 ohm option) on the 4-ohm version, if the drivers are not the same sensitivity (and they will very likely NOT be the same sensitivity) one or the other will be louder than the other one.
My suggestion is ditch the 4-ohm version in favor of another 2-ohm version, and go for the 1.3 ohm load. If you don't want to buy anything, you are left with a 2-ohm load, and two woofers only. The output difference? Less than 1dB, and you'll NEVER hear it.
It all reminds me of something that Molière once said to Guy de Maupassant at a café in Vienna: "That's nice. You should write it down."

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