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#1094562 - 06/29/07 01:27 PM how do i know how many "ohms" my amp is running at ?
clunker
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Registered: 06/29/07
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ok heres the deal, i bought a Rockford Fosgate P4004 amplifier and
heres the specs on it (# Punch P4004 - 400 watt 4-channel amplifier

[i]50x4 @ 4 ohms, 100x4 @ 2 ohms, 200x2 @ 4 ohms, 12dB/oct Butterworth HP/AP/LP crossover variable 40-400Hz, RCA inputs, RCA pass thrus, 2/4 ch switch, cast aluminum heatsink, military spec PCB, and remote cast aluminum heatsink, military spec PCB, and remote Punch Bass EQ with 0-18dB @ 45Hz. H 2.4" x W 11" x L 16.4"), i bought it from bestbuy and had them install it. it is connected to 4 speakers (sony XS-V6942A). now here is my question, how do i know if its running at 50x4 @ 4 ohms OR 100x4 @ 2 ohms ?


Edited by clunker (06/29/07 01:32 PM)

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#1094625 - 06/29/07 02:48 PM Re: how do i know how many "ohms" my amp is running at ? [Re: clunker]
1FryShort
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Since you're speakers are 4 ohm speakers, you're amplifier is playing into a 4ohm load, thus 50w rms x 4.
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#1094734 - 06/29/07 04:48 PM Re: how do i know how many "ohms" my amp is running at ? [Re: 1FryShort]
clunker
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so if i had "2 ohm" speakers, they would be playing at 100x4 ?
which i assume is better ?

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#1094746 - 06/29/07 05:30 PM Re: how do i know how many "ohms" my amp is running at ? [Re: clunker]
1FryShort
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Yes, if you had a single 2 ohm speaker on each channel, they would be seeing 100w each instead of 50w. It's only better if the speakers perform better with the additional power. In your case, I think the Sony's might sound a little better with 100w than with the 50w they are getting. They are rated at 80w rms.
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#1094930 - 06/29/07 09:57 PM Re: how do i know how many "ohms" my amp is running at ? [Re: 1FryShort]
clunker
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so how do i make my sonys perform at 100 watts ?
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#1095195 - 06/30/07 12:09 PM Re: how do i know how many "ohms" my amp is running at ? [Re: ]
clunker
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im sorry that was very confusing, so how do i do this ?

"my advice to you is run them all 4 from 2 channels parallel each channel. that will give you 100w to each speaker @2ohm"

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#1095196 - 06/30/07 12:17 PM Re: how do i know how many "ohms" my amp is running at ? [Re: ]
1FryShort
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 Originally Posted By: seethru231982
sorry, my bad that will not produce 100W @2 ohm that will produce 75w @ 2ohm to each speaker


He cannot bridge that amplifier into a 2 ohm load; it is not stable there.
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Alpine HU (forgot the model#, who cares)
BA Pro 6.5lf mids
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CDT es200us
kicker 8" sealed pre-fab
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#1095235 - 06/30/07 03:35 PM Re: how do i know how many "ohms" my amp is running at ? [Re: clunker]
LanBlau
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 Originally Posted By: clunker
im sorry that was very confusing, so how do i do this ?

"my advice to you is run them all 4 from 2 channels parallel each channel. that will give you 100w to each speaker @2ohm"



Don't worry about it -- it's wrong anyway.

If you only used 2 ch of the amp, and connected to speakers to each channel, you'd get 100w per channel, yes, but that 100w would be split between the 2 speakers -- no improvement.

The only way to make that amp produce 100w into 4 speakers would be to find 2 ohm speakers that fit your car. Infinity comes to mind.

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#1095236 - 06/30/07 03:43 PM Re: how do i know how many "ohms" my amp is running at ? [Re: LanBlau]
clunker
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http://www.cardomain.com/item/INFKAPPA6937I

like these ones ? would they be a big upgrade ? and they would make it 100x4 watts ?

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#1095239 - 06/30/07 03:54 PM Re: how do i know how many "ohms" my amp is running at ? [Re: clunker]
1FryShort
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Ahhh, yes... you have it now. Those are better than the Sony's, and the 2 ohm resistance will allow your amplifier to run at 100w x 4. \:\)
_________________________
Alpine HU (forgot the model#, who cares)
BA Pro 6.5lf mids
Seas soft domes
CDT es200us
kicker 8" sealed pre-fab
PPI pc 275
PPI pc 4400

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