Amplifier Guru's HELP - diyAudio
Go Back   Home > Forums > General Interest > Car Audio

Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Reply
 
Thread Tools Search this Thread
Old 30th December 2008, 07:41 AM   #1
diyAudio Member
 
Join Date: Dec 2008
Default Amplifier Guru's HELP

Here's the setup :

Deck = Kenwood KDC138

Line Driver = Soundstream MTube8

Front Stage = Eight 6 1/2" MCM Mid/woofers, Four Power Acoustik Tweeters.

Front Stage Power = Hifonics ZXI6006 (300x2 @ 2ohm)

Subwoofers = Four Polk DX 12-4 Subs

Sub Power = Hifonics BXI2006D (2000x1 @ 1ohm)

Here's The Problem :

This morning I started my truck w/ volume @ 0, proceded to turn volume up to 1/8 and got a cracle type screach sound that scared me, I turned the volume down then back up, it made the noize again but louder and worse then a loud pop came from behind me where my amps are and an insanely loud constant screech.

I pulled the rca's from my front stage amp and it stopped, the amp was not in protection, I plugged the left rca in and again the noize, pulled it and plugged the right in no noize just music.

I then took the right rca and plugged it in the left input and same insane noize.

I figured from the volume of the pop it had to be a cap that blew in the amp but I see no visually identifiable problems inside the amp.

Imagine a good old black cat fire cracker going off in the cab of a toyota xtra cab truck, well it wasnt that loud but lets say about 3-6db less (just a guess).

I also noticed my sub amp went into protection, but when I shut down the system and restarted with the rcas unhooked from front stage amp the sub amp came out of protection.

Has anyone ever had anything similar happen or know what to look for?
  Reply With Quote
Old 30th December 2008, 08:12 AM   #2
Clipped is offline Clipped  Thailand
diyAudio Member
 
Join Date: Mar 2005
Location: home
Send a message via MSN to Clipped
check your rca jack heads.
  Reply With Quote
Old 30th December 2008, 10:57 AM   #3
diyAudio Member
 
Join Date: Nov 2003
Location: Louisiana
With no RCA cables connected to any of the amplifiers and the amps on, measure the DC voltage on the RCA shields of the amplifiers (black meter probe on the chassis ground terminal of one of the amps). All should read ~0v.

If there is no significant DC voltage, plug the head unit into each of the amps individually. Does each amp play normally when driven directly by the head unit?
  Reply With Quote
Old 30th December 2008, 04:06 PM   #4
diyAudio Member
 
Join Date: Dec 2008
Quote:
Originally posted by Perry Babin
With no RCA cables connected to any of the amplifiers and the amps on, measure the DC voltage on the RCA shields of the amplifiers (black meter probe on the chassis ground terminal of one of the amps). All should read ~0v.

If there is no significant DC voltage, plug the head unit into each of the amps individually. Does each amp play normally when driven directly by the head unit?

I will try this today....
  Reply With Quote
Old 30th December 2008, 10:17 PM   #5
diyAudio Member
 
Join Date: Dec 2008
Ok no DC voltage @ rca inputs of amps.

If I plug rca into CH 1 first I get a full power midrange horn honk sound.

If I plug rca into CH 2 first I dont get the sound.

It doesn't matter which side of the cable I use, red or black I get the same results.

When I plug CH 2 in first I get alternator whine that changes pitch and volume with throttle position.

Once CH 1 is plugged in I still have the Alternator whine.

I cleaned my grounds and made sure my wiring is firm.

I do not hear a whine from my subs/sub amp, just my front stage amp.

I had seperate rca's going to each amp from the line driver but now the line driver is out and I am using the sub amp as a pass thru.

Any clues ??????
  Reply With Quote
Old 30th December 2008, 10:17 PM   #6
diyAudio Member
 
Join Date: Dec 2008
Un moderate me so I can get some help...these slow posts do not help me....
  Reply With Quote
Old 30th December 2008, 11:07 PM   #7
diyAudio Member
 
Join Date: Nov 2003
Location: Louisiana
Everyone goes through moderation. It's there to prevent crazies from posting. Getting upset isn't working in your favor.

If you can plug into channel 2 with no noise, it may mean that the shield for channel 1 is broken or loose inside the amp. It could be a broken solder connection, an open trace or the jack may be physically damaged.

With no RCA cables plugged into the amp, what is the resistance from EACH RCA shield on the amp to one of the non-bridging speaker terminals (all of the non-bridging speaker terminals should be connected together internally)?
  Reply With Quote
Old 30th December 2008, 11:55 PM   #8
diyAudio Member
 
Join Date: Dec 2008
Quote:
Originally posted by Perry Babin
Everyone goes through moderation. It's there to prevent crazies from posting. Getting upset isn't working in your favor.

If you can plug into channel 2 with no noise, it may mean that the shield for channel 1 is broken or loose inside the amp. It could be a broken solder connection, an open trace or the jack may be physically damaged.

With no RCA cables plugged into the amp, what is the resistance from EACH RCA shield on the amp to one of the non-bridging speaker terminals (all of the non-bridging speaker terminals should be connected together internally)?

I put a different amp in and same thing, So looks like it's my deck.

Moderating noobs never stops the crazies from posting, just some spammers....
  Reply With Quote

Reply


Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
One for the GURU's.... Lostcause Class D 2 19th July 2008 11:56 PM
guru wanted mynameis_nobody Multi-Way 11 15th November 2007 03:11 AM


New To Site? Need Help?

All times are GMT. The time now is 09:49 AM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright ©1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2