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ConfusedTEEN
Dodge Dakota
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11/19/2003
11:21:59
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 Subject: Rockford Fosgate
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Just bought 3-8" HX2 subs and the are DVC at 4 ohms per coil. Max power 800 watts nominal 400 watts. 1. what size amp would i need 2. How many channels does it need to have? 3. how to wire it optional
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jd
Dodge Dakota
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11/21/2003
04:06:00
| RE: Rockford Fosgate
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ok here we go
you are gonna want approx a 1200 watt amp more IS better... it is better to turn your amp down than totally cranked
as for wiring with dvc there is a nuimber of ways to wire for different impedence, series,parallel, or series-parrallel. what you have to remember is when you wire in series you add the resistance of each item so 6 voice coils 4 ohm =24ohm not too good
in parallel you take the inverse of the ohms 4 ohm being 1/4 so 6 vc by 1/4 ohm =1.5 ohms
this will run fine on an amp stable to 1 ohm
oh and you are gonna want a monoblock or 2 ch bridgable amp
you can also wire your subs using series and parallel in the same circuit to get almost any resistance you need for your amp
and also the lower an amp is stable to the better usually 1 ohm and high quality
hope that helps
l8r
jd
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CptnFantastic
Dodge Dakota
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11/22/2003
11:17:59
| RE: Rockford Fosgate
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The 3 available impedences for 3 4ohm DVC woofers are:
All series: 24 ohms. blah
All parallel: 2/3 ohm. whew - tough to drive.
Series each woofer for 8ohms each and then parallel the 3: 2.67ohms total. Perfect for any 4 ohm or 2 ohm stable amp.
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DSW
Dodge Dakota
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11/22/2003
14:36:34
| RE: Rockford Fosgate
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One more configuration to ponder. Also, jd is wrong on the parallel seutp, Cptn Fantastic is right.
6 - 4 omh VC's parallel = .66 ohms
6 - 4 ohm VC's series = 24 ohms
VC's parallel - subs series = 6 ohms
VC's series - subs parallel = 2.66 ohms
Run the last setup series-parallel with an amp that is stable running a bridged 2 ohm load.
To figure impedence; parallel add up all the speaker impedences, series, add up all the impedence numbers, THEN divied this number by the numbers of speakers. parallel 4+4=8, series 8+8+8=24, 3/8=2.67
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jd
Dodge Dakota
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11/22/2003
21:18:39
| RE: Rockford Fosgate
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ok ok sorry i was partly correct but DSW you are also partly wrong
when wiring in series you DO ADD ALL the impedences, duh on after the other the power has to go from one to the other then the other so add it.
parallel..... read it for your self at http://www.carstereo.com/help/sp_wiring.cfm
they explain it good.
your speakers would run 0.667 ohm if in parallel
like the captian said series parallel is your best bet...
good luck
jd
sorry but shut up dsw
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DSW
Dodge Dakota
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11/23/2003
05:02:48
| RE: Rockford Fosgate
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Correction,
To figure impedence; SERIES add up all the speaker impedences, PARALLEL, divide the impedence load by the numbers of speakers. SERIES 4ohm+4ohm=8ohm, PARALLEL 3speakers/8ohm = 2.67 ohm.
Happy now jd? I was correct on everything else besides this (son was bugging me when I was finishing the post) and the guy wouldn't have ruined anything with my recomendation. Correct me if i am wrong, but I said to run the speakers series-parallel 2.67 ohms with a 2 ohm stable amp.
If your the expert, why did you recommend a 1 ohm stable amp for .67 ohm load.
Now who needs to shut up?
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92Dakota
Dodge Dakota
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11/23/2003
23:54:35
| RE: Rockford Fosgate
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Just get a 2 ohm stable mono amp.
1000-1500 watts RMS.
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