Stereos overheat
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Stereos overheat
My neighbor recruited me into helping to install a new head unit into his '78 f-250. We have two speakers, one in each door. Head unit is 50w x 4 @ 4ohms. The two speakers are 100w x 4ohms each. The old head unit would run great for around 15 minutes and then the sound dies out. The new unit does the same thing. That's where he came and got me. The new head unit will run around 15-20 minutes and get real hot to the touch on the heat-sink on the rear of the unit. I have checked the connections with an ohm meter and got no resistance to the battery (-). I even put in 16ga. speaker wires. Why are both units getting so hot the sound shuts down with the rest of the radio still functioning?
Edit: The a/c is not the source of the heat. The unit heats up while out of the dash also.
Edit: The a/c is not the source of the heat. The unit heats up while out of the dash also.
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I'm not the brightest when it comes to electronics...
The speakers are cheap road master something or other, 100watts @ 4ohms.
The head unit is 50watts x 4 channels @ 4ohms.
Pioneer DEH-2400UB (DEH2400UB) In-Dash CD/MP3 Car Stereo Receiver
RS525 - Two 5¼ inch Three Way Speakers
I hope these links help you find the specs your lookin for
The speakers are cheap road master something or other, 100watts @ 4ohms.
The head unit is 50watts x 4 channels @ 4ohms.
Pioneer DEH-2400UB (DEH2400UB) In-Dash CD/MP3 Car Stereo Receiver
RS525 - Two 5¼ inch Three Way Speakers
I hope these links help you find the specs your lookin for
Super Duty
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From: NW IN.
Usually this problem is caused by the amp in the head unit being mismatched with the speakers. I don't think that's the problem here since the head unit is rated at 14 watts RMS and the speakers are rated at 20 watts RMS.
The next thing to do, if you haven't already, is ground the head unit directly to an unpainted chassis bolt and run a fused power wire directly to the battery.
The next thing to do, if you haven't already, is ground the head unit directly to an unpainted chassis bolt and run a fused power wire directly to the battery.
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I'll have to try that tomorrow after work. I ohm tested both speakers, and one was 3.9 and the other was 3.7 ohms, but I don't think the left speaker is as good of quality sound. I switched the two left to right, and the same speaker (now on the right) still sounds kind of muffled, and doesn't seem to be near as loud. I have real bad hearing, so if I can pick it up, something has got to be wrong. Is it possible a bad coil could be causing all this? The cones all look fine and I can't find any tears.
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Super Duty
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From: NW IN.
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Tonight, just for grins, I ran both the pos and neg wires directly to the battery.
The heat sink still got piping hot. Next thing is new speakers....wal-mart is an hour and a half away....ROAD TRIP!!!!
The heat sink still got piping hot. Next thing is new speakers....wal-mart is an hour and a half away....ROAD TRIP!!!!
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Thanks for the help fz1dave! We bought a pair of speakers at carquest, and voilà, problem fixed. Playing with the speakers once they were completely out, the little tweeter in one of the speakers was bad, but the larger one was fine, giving me an inaccurate reading. Hope this helps somebody down the line!
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