the12volt.com spacer
the12volt.com spacer
the12volt.com spacer
the12volt.com spacer
icon

VW, Memphis Amp getting hot


Post ReplyPost New Topic
< Prev Topic Next Topic >
davedyer79 
Copper - Posts: 178
Copper spacespace
Joined: February 18, 2004
Location: United States
Posted: July 10, 2006 at 9:24 AM / IP Logged  
Hello, I installed a Panasonic head unit, Memphis amp (500D) and a Memphis PR12 DVC in a Memphis slot ported box in a 2003 VW Passat this weekend.  I just looped the coils together and into the left side of the amp.  For some reason I keep blowing subs (frying the coil, therefore when  you push on the speaker it doesn't move) and the amp stays REALLY hot.  I have installed numerous of these setups in cars and have never had this problem.  I replaced the amp twice and the sub 3 times.  I have tested all the connections repeatedly with a DMM, all meter correctly.  Has anyone ever had this problem with a Volkswagon, or is it me.  The ground is only 2 ft long, all power leads are 8 guage, 50 amp fused.  Advice would be appreciated.  Thanks, David
davedyer79
aznboi3644 
Gold - Posts: 2,600
Gold spaceThis member consistently provides reliable informationspace
Joined: May 01, 2006
Location: United States
Posted: July 10, 2006 at 6:26 PM / IP Logged  
Is your gain set correctly???
12vdeej 
Member - Posts: 26
Member spacespace
Joined: July 04, 2006
Location: United Kingdom
Posted: July 10, 2006 at 7:00 PM / IP Logged  

As far as im aware most/all amps these days have DC protection, but the situation you are describing sounds just like that to me. Any DC offset present within the audio signal will cause the voice coils to heat up rather than producing noise, leading to failure as you described. It would also cause the amps to get hot. If you can, test the output of the head unit to see if there is any DC voltage present within the output signal. Seeing as this is the only component that didnt get replaced it could have been the culprit. Also double check that you arent somehow short circuiting the output of the amp as this would lead to the same overheating problem. The suggestions i have made are unlikely situations, but are the only ones i can think of! As aznboi3644 suggested, turning the volume up too much will fry your sub, but thats so obvious its almost insulting !VW, Memphis Amp getting hot -- posted image.

aznboi3644 
Gold - Posts: 2,600
Gold spaceThis member consistently provides reliable informationspace
Joined: May 01, 2006
Location: United States
Posted: July 10, 2006 at 8:04 PM / IP Logged  
Lol...well some people overlook the most obvious.
davedyer79 
Copper - Posts: 178
Copper spacespace
Joined: February 18, 2004
Location: United States
Posted: July 11, 2006 at 8:26 AM / IP Logged  
Well, I checked all the connections again, 13.8volts at 12V, good ground, no junk at RCA and no DC/AC going to the subwoofer.  I wonder if I have the connection to the amp correct.  The Memphis 500D is a mono-block amp.  I just daisy chained the two coils together to a 2 ohm load (DVC 4 ohm) and tied them directly into one channel of the amp.  Should I have used the outside connections + and - ( I guess bridged mode, but you cannot "bridge" per say this amp).  Could a ohmage issue cause this amp to overheat??  The Memphis tech said I am pushing too much to the subwoofer, therefore blowing it.  I guess I can understand that.  I have pushed more wattage than this to these subs before with no problems.  But that doesn't explain why the amp is getting so hot.  Thanks so far for the suggestions. 
davedyer79
aznboi3644 
Gold - Posts: 2,600
Gold spaceThis member consistently provides reliable informationspace
Joined: May 01, 2006
Location: United States
Posted: July 11, 2006 at 11:08 AM / IP Logged  
You cannot bridge the amp...It only has two sets for easy wiring.
I looked at the site for those subs and the rms rating is 250 watts rms correct...Well at 2 ohms your pushing 500 rms to that sub...Have you not realized that is more power than the sub can handle?

Sorry, you can NOT post a reply.
This topic is closed.

  Printable version Printable version Post ReplyPost New Topic
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot delete your posts in this forum
You cannot edit your posts in this forum
You cannot create polls in this forum
You cannot vote in polls in this forum

  •  
Search the12volt.com
Follow the12volt.com Follow the12volt.com on Facebook
Tuesday, December 6, 2022 • Copyright © 1999-2022 the12volt.com, All Rights Reserved Privacy Policy & Use of Cookies
Disclaimer: *All information on this site ( the12volt.com ) is provided "as is" without any warranty of any kind, either expressed or implied, including but not limited to fitness for a particular use. Any user assumes the entire risk as to the accuracy and use of this information. Please verify all wire colors and diagrams before applying any information.

Secured by Sectigo
the12volt.com spacer
the12volt.com spacer
the12volt.com spacer
Support the12volt.com
Top
the12volt.com spacer
the12volt.com spacer