20 Most Recent Rockford Fosgate p-450.4 Car Audio Amplifier Questions & Answers


are u sure u have them running at the right ohms, for not only the subs but the amp too...if you go lower than your amp is rated you can fry stuff...via protect mode......hopefully this helps

Rockford Fosgate... | Answered on Dec 18, 2014


Check your ground. At the battery check for oxidation, check your RCA's and make sure they are tight. It's usually something that's loose or rusted/corroded. If you still have noise, post a comment with car make model and year as well as audio products installed and I can help you troubleshoot further. Hope this helps.

Rockford Fosgate... | Answered on Aug 17, 2009


Hi try http://www.alliedelec.com , they are based in the states and will ship. Not sure if what you are looking for is generic or specific, but they have a pretty good range.
Good luck

Rockford Fosgate... | Answered on Jul 11, 2009


Disconnect all speaker wires from the speaker terminals of the amp and disconnect the RCAs. Replace the 30 amp fuse with a 15 amp fuse. If you turn it on and it blows the fuse, it's likely that it has shorted output transistors. If that's the case, you need to have the amp repaired.

Rockford Fosgate... | Answered on Dec 22, 2007


The amplifier probably has shorted output transistors.

Disconnect the speakers and RCA cables. Replace the fuses with two 10 amp fuses or a single 20 amp fuse. If the amp blows the fuse when it powers up, the outputs are almost certainly the problem. Don't try it with the two 30 amp fuses. The smaller fuses will provide more protection for the power supply. If the amp powers up with the smaller fuses and they don't blow, check the speakers and the wiring (for shorts to ground or shorts between wires).

Rockford Fosgate... | Answered on Nov 22, 2007


First off will the fastener turn ? If not try using a bit of wd-40 and letting it "soak" for a little while . Also be sure you are using a good proper sized Phillips screwdriver . If the fastener still won't turn try using a can of "computer duster " inverted so the liquid comes out , note this will be well below zero degrees , and freeze the screw head , then try turning . If the fastener is stripped and the ttol slips you will have to remove the amp cover and grip it with a pair of vise grips ,pliers or a flat blade screw driver .

Rockford Fosgate... | Answered on Sep 24, 2019


You are driving it too hard. If continued, the amp will go into protect mode to save you from yourself.

Rockford Fosgate... | Answered on Jun 12, 2019


Yes. Wire the two 2 Ohm speakers in series and connect them to one channel. Connect the 4 Ohm speaker into the other channel. This will give you a balanced 4 Ohm load on each channel.

Rockford Fosgate... | Answered on May 12, 2019


i have a punch 45 but i'm missing the speaker wire connector.... were do i go to get one...

Rockford Fosgate... | Answered on Feb 03, 2019


Please be more specific. RF doesn’t share schematics

Rockford Fosgate... | Answered on Feb 03, 2019


IF you are looking for a schematic diagram on the amp, you wont find it. IF you need the connection information you can look on their site, There is a repair video on that unit attached . Rockford Fosgate Car Stereo Amp Repair

Rockford Fosgate... | Answered on Jan 13, 2019

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