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Discussion Starter #1 (Edited)
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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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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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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Discussion Starter #4
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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Discussion Starter #5
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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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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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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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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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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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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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.
If you add the trunk; it comes with two speakers. I don't use the amp for mine but many do.
 

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Discussion Starter #12
I was thinking of a trunk but I'll probably go with bag speakers at some time.
 

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Holy crap! You have your audio at 15?

I have the Rockford Fosgate amp w/6.5" up front (don't generally ride with the trunk unless the wife isn't riding her bike) and if I go over 11, no matter what the speed, it's way too loud. I generally ride with the sound at 8 or 9. Plus I have the Arlen Ness shorty windshield.

You may want to consider installing 6.5s" in the fairing.
 

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I was thinking of a trunk but I'll probably go with bag speakers at some time.
That's what I figured. Once I get my bike, I'm going to do the front with my Hertz speakers and RF amp that I took out of my SG. Then during the winter I will upgrade to the Soundstream 4 channel amp with some Polks in the bags.
 

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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...
I hate to admit it, but I had my RF PBR 300 installed professionally. I am usually a do it yourself gut, but didn't want to end up with a wiring issue. The guy that did it installs for several HD dealerships and car dealerships in the area and is a RF retailer. I upgraded the speakers to Polk MM531s in the front. Left the trunk alone for now. There is not much room back there for a switch out, and I usually have it off anyway. After switching speakers, I played around with the gain per the RF instructions. Basically, start at 0 and turn the radio up until you start to perceive distortion and then back it down slightly, next increase the RF gains until distortion occurs and back it off a bit. I did this with a variety of music styles I listen to. I tried to pick good clear audio tracks for my reference samples. A gain setting of 4.5 is where I ended up using an iPod in the AUX mode. :rolleyes:Now, the bike audio system has a mode setting of high, medium and low which increases the volume as you increase speed. Mine is set on the "low" setting. This means there is a slight increase in volume as the bike accelerates. I feel like I could blow the speakers at a gain of 4.5 if I crank it too much. I never go over a volume level of 13..... and that can be painfully loud. One thing to remember also is that radio is more distorted than playing through an iPod in the AUX mode if you are playing good quality audio recordings. I have read that the RF does run HOT, so it is possible that it is overheating, and the signal is starting to break down. The fairing is pretty tight, so not much air flow. One other thing to remember is that the RF is not weatherproof.
 

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Well, I learned something today. After installing the mounting plate, which will hopefully resolve the heat issue, I turned the auto volume control off and now I can turn the radio volume way up. Before this, I had the control set to low. I'm thinking they engineered a max volume of 15 if the control was on at all. I have the gain turned all the way to 0 now. We will see if the heat issue is resolved with both things I did today.


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Discussion Starter #17
Holy crap! You have your audio at 15?

I have the Rockford Fosgate amp w/6.5" up front (don't generally ride with the trunk unless the wife isn't riding her bike) and if I go over 11, no matter what the speed, it's way too loud. I generally ride with the sound at 8 or 9. Plus I have the Arlen Ness shorty windshield.

You may want to consider installing 6.5s" in the fairing.
Well some would say I'm deaf...
When the amp was working I ran at 7-10 under 70mph. My BOAB pipes are pretty load too.:D
The Kickers are standard eqp. but need a amp (IMHO) to get better quality sound, the volume would not increase over 15 with out the amp. With the amp it's about 7 with the amp at 4-5 gain. The sound was very clear and a great improvement until the heat issue.
I know the 6.5" would be better but I'm trying to be done spending for a while..
My bud has the 2ch 2ohm RF amp in his glide with JL's 6.5" I think it sounds great.
I have mounting/fan plate fabbed up. Should have it installed and tested tomorrow night.
 

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I agree that the kickers improve dramatically with an amp installed. I would however suggest that you set set the amp to hp rather than ap for 5.25 speakers, and turn down to 0 gain.


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Discussion Starter #19
I agree that the kickers improve dramatically with an amp installed. I would however suggest that you set set the amp to hp rather than ap for 5.25 speakers, and turn down to 0 gain.


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Thanks I'll give that a try.
 

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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.
Auto Volume should be turned off.

My gain is set just under 3 and when using the handlebar volume control, I can go to about 20 with good results.
 
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