#1724567 - 10/24/09 11:35 AM
Setting up a Rockford Fosgate P500.2
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ufool
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Registered: 10/24/09
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I have hooked up a Rockford Fosgate P500.2 amp up to my door speakers. Which are alpine type R component speakers front and back, but in the front I also have a crossover and additional tweeter. I have the front speakers in the one channel and the rears in the other channel. I am unable to get these speakers to get lould with out the amp going into protection. If i turn down the gain it will not go into protection but it woulnt get loud. The amp turns off whenever its really lould not from overheating. Do the additional tweeters change the independence of the front channel from the rear?? Could this be causing the amp to go into protection mode?? Would it be better to run all the speakers on one channel brigded??
Thanks
Jeff
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#1724568 - 10/24/09 11:41 AM
Re: Setting up a Rockford Fosgate P500.2
[Re: ufool]
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ufool
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Registered: 10/24/09
Posts: 6
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Rated continuous power
125W x 2 @ 4-Ohms RMS
250W x 2 @ 2-Ohms RMS
500W x 1 @ 4-Ohms bridged RMS
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#1724626 - 10/24/09 06:57 PM
Re: Setting up a Rockford Fosgate P500.2
[Re: ufool]
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basher8621
SD I wear red in a Crips neighborhood
Registered: 09/30/07
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I would run one set of components per channel. Is it the amp going into protection or the crossover's tweeter protection kicking on.
So are you saying you have both Alpine components hooked up to one channel currently and the rear speakers hooked up to the other channel? If so don't do that and the Alpine crossover is built for one tweeter per crossover not two.
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#1724679 - 10/24/09 09:29 PM
Re: Setting up a Rockford Fosgate P500.2
[Re: basher8621]
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keep_hope_alive
in another life, i'm a serial killer
SD I Power Bombed the Undertaker
Registered: 04/24/07
Posts: 13370
Loc: Quad Cities, IL
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couple issues with your configuration.
first, you have a two channel amp. consider this:
Channel 1 = LEFT
Channel 2 = RIGHT
that is how the RCA inputs work - Left and Right not Front and Back.
so, if you are going to parallel speakers - you need to do it correctly.
Combine Front Left and Rear Left together into Channel 1.
Combine Front Right and Rear Right together into Channel 2.
Next, address how your tweeters are wired. If you have a separate crossover for the additional tweeter, then maybe it can work. To Basher's point, you can't connect two tweeters to one crossover. However, by using six tweeters you are running the amp at 1 ohm for a while, which may be causing it to go into protection.
Where are the two front tweeters and how are they aimed?
Why do you feel you need more tweeters up front?
If you disconnect the extra set of tweeters, does the amp still shut off?
Independent of the above, use a DMM to measure the resistance in the speaker wiring, do this at the amp. first, disconnect the speaker wires from the amp. meter each speaker pair (+ and -) and note the resistance. Then let us know the results. You should not see a number lower than 3 ohms on any given pair. It is possible this is from a short.
I have other tests to try, but let's start with these.
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#1724680 - 10/24/09 09:30 PM
Re: Setting up a Rockford Fosgate P500.2
[Re: keep_hope_alive]
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keep_hope_alive
in another life, i'm a serial killer
SD I Power Bombed the Undertaker
Registered: 04/24/07
Posts: 13370
Loc: Quad Cities, IL
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oh, and you cannot bridge that amp to all of those speakers.
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#1724921 - 10/25/09 09:01 AM
Re: Setting up a Rockford Fosgate P500.2
[Re: ufool]
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ufool
SD Newbie
Registered: 10/24/09
Posts: 6
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What I have up front is a CDT component set, I blew the woofer and replaced it with the alpine coaxil speakers.
So a coaxil speaker plus a tweeter equals 2ohms. So the front channel is running at 1 ohm. I see the problem.
Next I will disconnect the tweeters and just run the 4 coaxils.
I see you guys are recomending I run a left channel and a right channel. I will try this and see how it works.
What do you think about wiring the speakers like this (wiring option #2) and running the amp bridged?
http://www.rockfordfosgate.com/rftech/woofer_wizard.asp?submitted=true&woofer_qty=4&woofer_imp=1
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#1724956 - 10/25/09 10:57 AM
Re: Setting up a Rockford Fosgate P500.2
[Re: ufool]
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highend64
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Registered: 11/04/00
Posts: 1867
Loc: CA
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Ideally I would wire both left speakers to the left channel and both right speakers to the right channel for a 2 channel amp. The disadvantage to this is loss of fader control. Also I would agree with KHA, try to disconnect the extra tweeter to see if the amp still go into protection.
_________________________
88 Honda Accord
Alpine
CDM-9803
JBL P80.2 main amp
Alpine SPS-500 front speakers
Atomic AT-1500.1D sub amp
Diamond Audio 10" D3v1 in a 1.25 cu.ft. ported box
tuned to 33hz.
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#1725670 - 10/26/09 06:35 PM
Re: Setting up a Rockford Fosgate P500.2
[Re: highend64]
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keep_hope_alive
in another life, i'm a serial killer
SD I Power Bombed the Undertaker
Registered: 04/24/07
Posts: 13370
Loc: Quad Cities, IL
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don't bridge the amp to mono and parallel and series the speakers. it will sound like ass. don't series wire coaxial speakers in general.
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