Go Back   TeamTalk > Maintenance Tips, How-tos and Refurbishing Topics > Audio/Stereo

Reply
 
Thread Tools Display Modes
  #1  
Old 06-03-2015, 10:50 AM
jafo9's Avatar
jafo9 jafo9 is offline
MC Devotee
 
Join Date: Jan 2011
Boat: 2002 X30 LTR
Location: Southeast
Posts: 1,142
How important is getting 12V at the trigger for an amp?

This may be a silly question, but one of my 2 amps died yesterday. It was an old Rockford Fosgate Punch P400-4. It sits next to a Wetsounds SYN2. The external fuses are fine and the voltmeter reads a solid 12+V at the power terminals on the amp. The trigger is only getting 11ish volts according to the meter. The trigger wire runs from the HU around the bow and to the standard amp area behind the observers seat in my X30. I'm guessing there is voltage drop from the 14ga wire running that distance. It worked fine for several seasons and the SYN2 seems happy to turn on with the 11V signal. My question is if it is worth getting a solid 12v to the trigger input via a relay or am I chasing ghosts and the amp is just shot? Thanks all.
Reply With Quote
  #2  
Old 06-03-2015, 11:07 AM
Table Rocker's Avatar
Table Rocker Table Rocker is online now
MC Devotee
 
Join Date: Oct 2010
Boat: '96 ProStar 205, Sammy Duvall, LT-1
Location: Fayetteville, Arkansas
Posts: 2,417
How about jumping from your 12+ at the power terminal to the trigger terminal and seeing if it comes on?
__________________
'96 ProStar 205 SD LT-1
Reply With Quote
  #3  
Old 06-03-2015, 11:37 AM
MLA MLA is offline
MC Devotee
 
Join Date: May 2012
Boat: pontoon
Location: Lake Wylie Area
Posts: 1,383
I would also measure the voltage at the head-unit as well as the head-unit B+ The voltage drop could be in the head-unit, or you may be getting low voltage into the head-unit
Reply With Quote
  #4  
Old 06-03-2015, 01:00 PM
jafo9's Avatar
jafo9 jafo9 is offline
MC Devotee
 
Join Date: Jan 2011
Boat: 2002 X30 LTR
Location: Southeast
Posts: 1,142
thanks for the suggestions. weird, it powered up this am. sounded horrible going in and out and then worked fine for 30 min. and then turned off. i should have checked all the voltages when it powered up. my thoughts are that it is thermaling and shutting down. there is a Wetsounds HT4 listed in the for sale section. i'm thinking it would be a good replacement.
Reply With Quote
  #5  
Old 06-03-2015, 01:00 PM
Nordicron Nordicron is offline
TT Enthusiast
 
Join Date: Sep 2011
Posts: 483
Most quality stereo shops do use a relay for the triggers. But I'm guessing your fine with the 11v also. Guessing that when the boat is running you likely have more than 11volts also.
Reply With Quote
  #6  
Old 06-03-2015, 02:24 PM
David Analog's Avatar
David Analog David Analog is offline
MC Fanatic
 
Join Date: Sep 2013
Boat: N/A
Location: Texas
Posts: 588
I wouldn't invest in another piece of equipment until I accurately diagnosed what the true issue is.
Amplifiers/equipment may have slightly different turn-on voltage thresholds. You could have a bit of corrosion internally on one amplifier that can easily be cleaned up with a little spray tuner wash. A small amount of corrosion would be more likely to impact a low current circuit such as the turn-on. I also would go back to MLA's suggestion of measuring the HU turn-on voltage. 14-gauge wire is more than plenty considering the total remote turn-on current draw of less than .1 amp for two amplifiers and the modest distance. Integrity of connections could be another matter. So 11 volts sounds low. Contemporary HUs use a transistor driver to output the turn-on voltage so it is possible to have a low voltage problem here but easily remedied with an external relay even though the amount of current draw wouldn't ordinarily justify it.
Reply With Quote
  #7  
Old 06-03-2015, 04:28 PM
Keith2230's Avatar
Keith2230 Keith2230 is offline
MC Devotee
 
Join Date: Feb 2015
Boat: 2006 X-30 MCX
Location: Kansas City
Posts: 1,083
There's no way you should be getting that kind of voltage drop because of the wire itself. You've got a bad connection somewhere along the path or it's possible your head unit is only sending that much. Check at the head unit and work your way to the amp. I wouldn't trust any crimp connection. Protected soldered connections are what you want.

As mentioned, you can easily test the amp by bridging the battery connection to the remote turn on connection to see if it turns on. The 11 volts may not be part of the issue depending on how sensitive the circuitry in each amp is.
Reply With Quote
  #8  
Old 06-04-2015, 04:39 PM
jafo9's Avatar
jafo9 jafo9 is offline
MC Devotee
 
Join Date: Jan 2011
Boat: 2002 X30 LTR
Location: Southeast
Posts: 1,142
so i jumped from the 4ga 12v power to the trigger input. worked fine for my ski run today. just put it all back together and i did find a bit of a loose connection along the trigger wire near the HU. not sure if that is the problem as it was a splice to trigger the WS420. measured with the motor running and saw 12.9v at the trigger. i'm about to take my son for a wake boarding run so i'll see if it lasts. hopefully, at least this means my amp isn't dead. thanks for all your help. even if this works, i think i'll still put in a nice waterproof relay. i agree with the above comment that soldered and protected connections are much better than crimps. i try to solder as many of my wires as i can. sometimes its just not feasible for me in tight spaces like under the helm.
Reply With Quote
Reply

Thread Tools
Display Modes

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


All times are GMT -4. The time now is 01:34 PM.


2018