posted
hi, I am trying to wire 2 rockford fosgate he2 DVC 12's at a 1.6 ohm load. To do this i figured that i would wire one woofers as a 8 ohm woofer and the other as a 2 ohm woofer. then what i did was wire the two speakers negative terminals together and to the amp. then i wired the two speakers positive terminals to the amp also. so now all the wire is done. i doubled checked the polarity with a drill battery, and polarity is correct. i checked the impedance and it is at a 1.8 ohm impedance, which is close the the calculated 1.6 ohm impedance. now after playing some test tones, the speaker wired at a 2 ohm load moves farther or harder than the speaker wired at a 8 ohm load. This makes them move not in phase with each other like they have diffrent power going to them. please help. i think there is another way to wire the speakers correctly but i cant figure it out. any help or links would be appreciated.
-------------------- It Moves You! 1986 Camaro Z28 Posts: 192 | From: SF Bay Area | Registered: Jan 2001
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posted
heh, i almost made that mistake once...then i was schooled about it on here i'll do the same for you
it's all about basic electrical circuit principles. there is nothing wrong with your wiring...
in an electrical circuit components in series all receive the same current (in an ideal circuit...i.e. no resistance from the wire, etc.) and components in parallel all receive the same voltage.
i could go thru and get technical but i will just get to the point since each of your subs is at a different resistance the power each receives will be different causing one to get more power than the other. Power = V^2/R where V is voltage (out from the amp) and R is resistance (which in the case of a speaker is actually impedance. similar to resistance but with an imaginary part to it...like sq.rt.(-1). punch that in your calculator and tell me what it says unless it's a graphing calculator able to do complex algebra or something it'll give you some weird answer or "error" lol).
anyway...back to the non-tech part...using that equation you can see that since the R value is different for each sub, the power is different. the sub in parallel will get more power due to the lower resistance.
make sense? you need to wire both subs to the same resistance to solve your problem or get an amp that can handle a 1 ohm load
-------------------- "Those who give up liberty for the sake of security deserve neither liberty nor security" - Benjamin Franklin
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posted
ok ok thanks guys, that totally makes sense. After trying the sub configiration, I just wired the subs back to a 4 ohm load. Time for some amps!
-------------------- It Moves You! 1986 Camaro Z28 Posts: 192 | From: SF Bay Area | Registered: Jan 2001
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I think that I have said too much....................I must go now................the SPL Ninja's are upon me Need more power? UP YOURS!! with Excessive Amperage! Posts: 6070 | From: Northern California | Registered: Nov 1999
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