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eedukes 
Member - Posts: 33
Member spacespace
Joined: August 30, 2002
Location: United States
Posted: March 22, 2005 at 8:34 AM / IP Logged  
I have two Kicker comp VR 12" subs on a Soundstream VGA 1600.2, and a four channel Soundstream VGA 640.4 which runs four infiniti kappa 5x7 giving them 80w RMS. At certain volumes, the kappas cut off and to get them to come back on, I turn the volume down. What is the problem? They are not all that loud when they cut off and they only do it when on the CD player, not the tuner. If the I have the volume up to about 20 on the HU and I am listening to the CD player they cut out. With the tuner, I can turn the volume up higher an they wont cut out. The tuner is an alpine CDA 9847. I dont think it is the HU or the amp as the amp is never hot and the protection light is not on. HELP.
customsound79 
Copper - Posts: 65
Copper spacespace
Joined: August 07, 2004
Location: United States
Posted: March 22, 2005 at 9:59 AM / IP Logged  
First try checking the voltage going to that amp at the cutoff volume. Make sure it's not dipping much lower than 12 volts. If that's OK then try hooking your sub amp to your front or rear outputs to see if it is the head unit. Try the same with hooking the sub output to the 640.4, just don't forget to change your crossover point.
My wife will never understand why, lucky for her!
stevdart 
Platinum - Posts: 5,816
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Joined: January 24, 2004
Location: Pennsylvania, United States
Posted: March 22, 2005 at 10:47 AM / IP Logged  

...and make sure the 5x7's are crossed over at the amp through a high pass filter.

Chad7n7 
Silver - Posts: 408
Silver spacespace
Joined: March 09, 2004
Location: United States
Posted: March 22, 2005 at 3:35 PM / IP Logged  

Also check your ground, I have seen a few cases where a poor ground connection has caused this. When you turn the tuner on, it will pull ground through the antenna(reason for not shutting off on tuner).

Make sure you have good connections to a bare chassis.

forbidden 
Platinum - Posts: 5,352
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Joined: November 01, 2003
Location: Alberta, Canada
Posted: March 22, 2005 at 3:47 PM / IP Logged  

To me it sounds like a head unit issue.

Top Secret, I can tell you but then my wife will kill me.

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