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Gains setting?


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simpley 
Member - Posts: 10
Member spacespace
Joined: October 26, 2006
Location: Canada
Posted: October 30, 2006 at 1:30 PM / IP Logged  

Hello,

Need some help understanding and setting my gains correctly.  My HU has 2Volt amp preouts for front, rear and subwoofer.  I have these connected directly to my amps.  Both amps have a 3 voltage setting and a gain control.  The ranges on the volt selector are:

  • 0.2 to 0.6
  • 0.6 to 2.0V
  • 2.0V to 8.0V

I have my amps set on 0.6V to 2.0V and my gain is almost at full MAX.  The question that I have is if it isOK to have gain so high on the amps?  From what I have heard the lower the gain setting the better the sound, and clarity, however my set up sound very, very clean, and clear with no distortion.  I also would like for it to play louder, If I switch the voltage selector to 0.2V to 0.6V it increses the volume big time but that does not match the 2.0V pre outs from the HU, it that still OK thing to do?  Lastly my speakers are rated 80Watts nominal, and 150Watts max,but my amp is rated at 4 x 90, am I overpowering my speakers with gain set so high?  AS mentioned before they sound relly good and clear, I just don;t want to blow these.

2006 Jetta
Clarion MAX675VD HU
Clarion APX4360 & DPX1800 AMP
Focal Polyglass all around
2.5 Farad CAP
killer sonata 
Silver - Posts: 718
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Joined: May 17, 2006
Posted: October 30, 2006 at 2:18 PM / IP Logged  
id keep it where its at but turn it down a smidgeon.
mike12volt 
Copper - Posts: 98
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Joined: September 17, 2006
Location: United States
Posted: October 30, 2006 at 3:08 PM / IP Logged  
Unless your amp is clipping, you won't blow your speakers if the specs. you wrote are rms. Sounds like those settings are for gain range. The best thing to do is to meter your rca from hu at aprox. 3/4 volume. then set your setting, and then set your gains below clipping level.
boulderguy 
Silver - Posts: 510
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Joined: April 17, 2005
Location: United States
Posted: October 30, 2006 at 7:02 PM / IP Logged  
If you aren't getting the output from that amp that you should - meaning if it ain't clipping at max gain now, switch the input selector to .2-.6v, then adjust your gains up from there. Don't worry about your HU being 2v etc, it doesn't mean much. The important thing is to keep the amps out of clip. As long as you don't clip you can largely disregard the max power ratings on most speakers.
Read the sticky on adjusting gains first.
stevdart 
Platinum - Posts: 5,816
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Joined: January 24, 2004
Location: Pennsylvania, United States
Posted: October 31, 2006 at 4:07 AM / IP Logged  

boulderguy wrote:
Read the sticky on adjusting gains first.

Uh, clue...nobody has written a tutorial on the subject yet for this forum, thus no approval for a sticky.

Build the box so that it performs well in the worst case scenario and, in return, it will reward you at all times.
boulderguy 
Silver - Posts: 510
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Joined: April 17, 2005
Location: United States
Posted: October 31, 2006 at 12:26 PM / IP Logged  
Oh, clueless. Could have sworn I saw that somewhere.
DYohn 
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Joined: April 22, 2003
Location: Arizona, United States
Posted: October 31, 2006 at 1:09 PM / IP Logged  
Write a good tutorial and post it for review.  If it is appropriate it'll get stickied.  :)
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boulderguy 
Silver - Posts: 510
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Joined: April 17, 2005
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Posted: October 31, 2006 at 1:45 PM / IP Logged  
Not sure I'm qualified, certainly not as qualified as some others around here. I may work something up & submit it.
killer sonata 
Silver - Posts: 718
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Joined: May 17, 2006
Posted: October 31, 2006 at 8:28 PM / IP Logged  
yes no need you are correct to an extent, unless ofcourse you are using an o-scope!
boulderguy 
Silver - Posts: 510
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Joined: April 17, 2005
Location: United States
Posted: October 31, 2006 at 8:41 PM / IP Logged  
It doesn't matter what the pre-out V from the HU is, it doesn't change the process. You're still going to need to find the amp's clip point. If you don't get it at the .6-2v setting, as it sounds like you haven't, then go to the next most sensitive setting & try again.
The 3-position sensitivity switch chooses what range your gains will be in but is only an approximation, which is why the 2v out doesn't really matter.
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