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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Technical Forums > AUDIO/VIDEO + BLUETOOTH + Electronics/Alarm/Software > amp getting hot.help please



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      07-17-2013, 08:09 PM   #1
rightaway
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Question amp getting hot.help please

I installed an alpine amp with the tecnic harness in the factory spot hifi amp spot in the trunk left hand side. I do not have a rear seat pass through and not sure how to keep it cool. first I smell it getting hot and it is very hot to the touch if I play my music loud. do they make a cooling fan or something to help keep it cool? anybody else have this issue?
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      07-17-2013, 08:21 PM   #2
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fyi, stock hifi with an alpine pdx5 amp. gain n amp turned down because it hums loud with higher gains and the door chime so super loud.
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      07-18-2013, 07:21 AM   #3
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What size power and ground wiring did you use? Make sure it is at least 8 gauge. Some amps just get hot by design though, especially in hot weather. So unless the amp keeps going into thermal protection you probably don't have anything to worry about.
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      07-18-2013, 05:05 PM   #4
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I ran 4 gauge wiring. if I play it loud for long enough, it will shut off. you smell it get hot.
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      07-18-2013, 07:39 PM   #5
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Look at your amp specs. Car audio amplifiers are stable at either 4 ohms or 2 ohms, sometimes both.
Check the resistance at your speaker wires at the amplifier connection. Amp must be disconnected. You'll have to round off cuz ohmmeters are DC and audio is AC, but it will be close. If the wires are close to two ohms, make sure your amp is stable to 2 ohms, if not get an amp that is. Two stereo amps one front, and one rear is another option.
The reason for this shut down is because the lower the resistance the higher the current, and the amps power supply must provide for this current. If the power supply is inadequate, the Amp will get very hot, and shut down by thermal protection.
4 gauge wire with our batteries in the trunk should be adequate, unless you running hundreds of RMS watts.
Get back to me with more specs, and I'll help you out the most I can.
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      07-18-2013, 08:51 PM   #6
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here is the amp I have...
http://www.alpine-usa.com/product/view/pdx-5

PDX amplifiers have the unique capability to deliver the same power output regardless of 2Ω and 4Ω loads.

I'm running the stock Hifi speakers.
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      07-18-2013, 11:24 PM   #7
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Are you using the 5th channel for the underseats? If so how do you have it wired? Stock hifi woofers are 2 ohm. So in parallel it will be a 1 ohm load and in series a 4 ohm load. You should have them wired in series.
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      07-20-2013, 07:52 PM   #8
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channel 1 and 2 front speakers,3 and 4 he under seat subs, channel 5 a 12" alpine sub. I'm not running the rear speakers.
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      07-22-2013, 06:56 PM   #9
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any ideas why it is getting so hot?
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      07-22-2013, 10:07 PM   #10
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Quote:
Originally Posted by rightaway View Post
any ideas why it is getting so hot?
This is a PDX 4.100 and a PDX-5 stacked...


... no overheating at all for almost 5 years.

My guess is that either your amp is defective or your wiring is incorrectly set.

Last edited by Technic; 07-24-2013 at 04:35 PM.
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      07-23-2013, 07:27 PM   #11
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what is your gain and cross overs set at? your sits higher than mine. I have a flat floor so the amp in lower. not sure if that makes a difference. what went stock in that location?
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      07-24-2013, 04:20 PM   #12
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I think it might just be your amp I'd exchange it for another pdx 5 if you can. I know there were problems with some of the older pdx amps getting too hot. The pdx v9 would probably be a better choice since its a newer amp.
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