Help please, Sound cutting out on new amp install
Thread Starter
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Road Master
Joined: Feb 2007
Posts: 781
Likes: 35
From: St Louis
Help please, Sound cutting out on new amp install
Stock HU, RF PBR 300x2, J&M 7.25 speakers(not rokkers), HDPDPLUS Ipod controller. Installed all, soldered and heat shrunk connections. Using high level inputs, Ground is good to the frame. Polyfill around speakers. Double checked all polarity. Set gain to just about 10 o'clock per Ultranutz directions. Test ran it without fairing, incredibly clear and ridiculously loud. Buttoned up fairing and re-tested for bass response. Ran at 3/4 volume for several minutes and sound would cut out for a few seconds and kick back on. Almost like the amp or speakers were safety shutting down. Took off the fairing to see if the amp protection circuit was kicking in but couldn't get it to shut down. Amp cooling better without fairing?? Anyone have their RF amp shut down like that? Has to be the amp as the speakers don't have a breaker correct? Any input appreciated. Amp gets quite hot even running without fairing.
Tourer
Joined: Jun 2012
Posts: 439
Likes: 435
From: Iowa
Sounds all to familiar. That amp at 2 ohm is pretty stout. IM gonna say you likely have blown a speaker. Time to troubleshoot with the fairing off. Turn amp gain all the way down. Next unplug one speaker and blast the volume for a few songs. If it plays good without issue then plug back in and do other side same way. When your music starts cutting out you've located the lemon. I just went through same thing with PBR J&M setup. Search back a few weeks and read up. I thought I had bad amp bad connections loose wire. Was bad speaker.
Tourer
Joined: Jun 2012
Posts: 439
Likes: 435
From: Iowa
One other thing... You mention amp gain at 10 o clock. That depends on how and where you mounted it. The gain adjustment on that amp has numbers on it. 1 being lowest an 10 is max. Most usually never can get past 5 without distorting. Set amp on all pass and freq. on about 60. Set your bass and treble on head unit in middle and just turn your AVC off. If you don't have at least the 217 watt rokkers they won't have much of a chance of survival. The little PBR pumps about 196 Watts to a 2 ,ohm speaker. If your speakers are toast I would recommend keeping your gain turned down below 3 on new ones until they break in a little. Not sure if there just too stiff when new or amp is a little hot when new but many seen to blow very early on. Break em in easy early and readjust gains later on will likely save ya some frustration. Popping the fairing off only takes a few minutes.
Tourer
Joined: Jun 2012
Posts: 439
Likes: 435
From: Iowa
Take it all out for now. Doubt that's it. The poly breathes. I'd be more concerned with it trapping moisture. However I can't see a coil heating up and quit working then come back after it cools. Didn't think they worked that way. My moneys on you toasted em.
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Extreme HDF Member
Joined: Nov 2007
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From: East of the Sun, West of the Moon
Fwiw john and his crew have never been a fan of polyfil for obvious reasons so that comment from them has absolutely no merit
2ndly. If your audio is fine with fairing off then you have issues with fairing on I would be looking at wiring
Where is your ground?
2ndly. If your audio is fine with fairing off then you have issues with fairing on I would be looking at wiring
Where is your ground?
Last edited by UltraNutZ; May 22, 2014 at 08:16 AM.
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Thread Starter
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Road Master
Joined: Feb 2007
Posts: 781
Likes: 35
From: St Louis
I put the ground on the frame right under the tins on the clutch side where the threaded hole is. Dremel sanded it to metal and connected. Very solid ground. Almost no voltage drop with measurement between battery posts and + battery post and amp end of ground wire. Removed some of the polyfill and left a light wrapping and so far so good. I may have gotten a little polyfill happy.
