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Posted on Sep 13, 2007

Peak power on rs-939 how many watts ???

How many watts total is this reciever any one know and about how old is this stereo??

1 Related Answer

Tom Chichester

  • 62329 Answers
  • Posted on Dec 23, 2020

SOURCE: Have an RS- 939 Fisher stereo receiver that will not power on but have power to it.

1. Open internal fuse
2. Power supply failure

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Hi,I have two 250w speakers at 8ohms ,could someone tell me if I need to get a amp with higher watts than the speakers?k

Speakers are rated either at RMS (root mean square) average power or Peak Power. An RMS of about 125 watt is equivalent to 250 watt peak. To match the radio and speakers they both need to be consistent. Also do not be confused with total radio power out vs per channel.

So if the speakers are 250 watt peak power then a radio with 125 watt per channel or 250 watt peak per channel would be a good match.
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With that much power the neighbors should hear you coming!
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I'm new to the Car Audio seen.I just bought four 6x9's.Now I need a good Amp to push all four of them.Here's what I have.Sony XS-R6945 4 Way 6x9" 800 watt Full Range Car Stereo Speakers Power...

Look for a 4-channel amp that pushes 50 watts RMS @ 4 ohm.
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Most likely cause is heat. The clearances behind the radio are often not sufficient to provde the proper air coolling that the higher power radios need. The heat sinks on the rear of the radio require a certain amount of air flow to dissipate the heat generated under high load conditions. If you add summer heat to the equation, you can have the radio going into thermal cutout to protect it circuity.
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Hello freshman_fox,

63 watts X 2 @ 4-ohms.
125 watts X 2 @ 2-ohms
250 watts X 1 @ 4-ohms bridged

Since no power rating is given @ 2-ohms in bridged mode, it means that the amp is only stable to 4-ohms.

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You can download the manual from here. Hope this helps.
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If your head unit didn't have RCA preamp outputs, you would used the standard speaker outputs from the head unit and connect them to the hi input plug of the amp.
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