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post #1 of 28 (permalink) Old 07-22-2013, 12:32 PM Thread Starter
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Default Rockford Fosgate Amp

I have been having some trouble with my RF PBR 300x4 amp. I followed all of the instructions on the posts in this forum. So it's wired directly to the Bat. With 6 gauge power and ground, all connections soldered and heat shrunk.

I noticed the volume dissipating and added distortion. I can normally cruise 75-80 MPH with the volume at the 15 level. Yesterday I had to run it at 21-27 to hear it and it was trashy.

It was about 100*, I did some searching and found these amps can run HOT.
So would overheating of the amp cause it to shut down and the stereo to operate as if no amp where in place?

After sitting in the garage for a couple hours the amp seems to be working again.

Would a fan solve this problem? Or did roast it?

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post #2 of 28 (permalink) Old 07-22-2013, 07:47 PM
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Why did you use 6 gauge that is over kill, it only calls for 10 and 8 would be a lot. Check you gains. That amp should not heat up unless you are over driving it. What type of speaker and are you running 2 or 4ohms. I have ran that amp at 4 ohms pushing Hertz speaker for hours in the heat with no problem. If you are running that amp at 2 ohms it's not too stable they were having problems with them. You would be better off with the PBR 300x2.
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post #3 of 28 (permalink) Old 07-22-2013, 07:57 PM
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Hot weather and I had the same problem. Not sure if there is enough air flow to stay cool under the fairing. I've got the mounting plate but haven't had a chance to install. I'm thinking it will solve the problem. Mines all tucked up above the stereo and I'm sure it's just to hot with 100 degree temps.


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post #4 of 28 (permalink) Old 07-22-2013, 10:49 PM Thread Starter
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Why did you use 6 gauge that is over kill, it only calls for 10 and 8 would be a lot. Check you gains. That amp should not heat up unless you are over driving it. What type of speaker and are you running 2 or 4ohms. I have ran that amp at 4 ohms pushing Hertz speaker for hours in the heat with no problem. If you are running that amp at 2 ohms it's not too stable they were having problems with them. You would be better off with the PBR 300x2.
Typo its 8 gauge. But 6 wouldnt make it heat. Running Kickers 4ohm gains were at 4.

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post #5 of 28 (permalink) Old 07-22-2013, 10:54 PM Thread Starter
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Originally Posted by anrman View Post
Hot weather and I had the same problem. Not sure if there is enough air flow to stay cool under the fairing. I've got the mounting plate but haven't had a chance to install. I'm thinking it will solve the problem. Mines all tucked up above the stereo and I'm sure it's just to hot with 100 degree temps.


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Mines mounted to the aluminum structure on the left side, like many
others have done so it has air all around it.
I picked up a 12vdc computer fan today, Ill mount that and see if it helps.

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post #6 of 28 (permalink) Old 07-22-2013, 11:34 PM
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I blew some high dollar speakers running the gain at 4-5. Fortunately they were under warranty. They suggested I run the gain around 1-2. So far so good but I only run the front speakers off it. The rear speakers run from the head unit with good results. I don't often have the trunk on anyway. I had my RF amp kick out in high temps but it was 115 degrees or more at the time. A more humid environment with a lower, but still hot temp, might do it too though. It's all about how well the heat is dissipated. A computer fan isn't a bad idea at all. Especially one with a separate switch.
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post #7 of 28 (permalink) Old 07-23-2013, 01:08 AM
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I blew some high dollar speakers running the gain at 4-5. Fortunately they were under warranty. They suggested I run the gain around 1-2.
Interesting that they recommend running the gain so low. I've run into the same issue with my Hawg Wired amp where it needs to be kept on the low side. Wonder what the issue is with these head units that causes problems when you try to run the gain in what would typically be the "normal" range? High level output too high?

Sorry, kind of off-topic, but this is the first time I've seen the gain issue mentioned in regards to the RF amps...

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post #8 of 28 (permalink) Old 07-23-2013, 03:59 AM
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Interesting that they recommend running the gain so low. I've run into the same issue with my Hawg Wired amp where it needs to be kept on the low side. Wonder what the issue is with these head units that causes problems when you try to run the gain in what would typically be the "normal" range? High level output too high?

Sorry, kind of off-topic, but this is the first time I've seen the gain issue mentioned in regards to the RF amps...
Maybe it has something to do with the head unit having plenty of horse power on its own or maybe the auto volume was set at the wrong setting. I dunno. I'm not an audiophile.
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post #9 of 28 (permalink) Old 07-23-2013, 06:35 AM
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Originally Posted by anrman View Post
Hot weather and I had the same problem. Not sure if there is enough air flow to stay cool under the fairing. I've got the mounting plate but haven't had a chance to install. I'm thinking it will solve the problem. Mines all tucked up above the stereo and I'm sure it's just to hot with 100 degree temps.


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If you take a notice at Amps today you will see that they have no air channels anymore for cooling. All good amps today are digital, which means they will not get hot like the old school amps. If I was to guess I would say that the hot humid air along with air flow blowing in by the amp is causing some condensation which in turn is giving you issues.
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post #10 of 28 (permalink) Old 07-23-2013, 07:54 AM
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4 ohms and gains at 4 are relatively normal. Sounds like a heat issue, hopefully the fan will solve the problem. Just out of curiosity why did you buy a 4 channel amp, are you planning to add speakers in the bags down the road.
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