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gain setting


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circle of ash 
Member - Posts: 15
Member spacespace
Joined: October 16, 2007
Location: New Jersey, United States
Posted: December 14, 2008 at 11:42 PM / IP Logged  
I have an Audiobahn A2300HCT amp and the gain setting on it is a dial. The beginning is 8v and the end clockwise is 0.2v. It doesn't seem to make sense to me. That seems backwards unless you guys know something I don't. And I didn't misread it.
stevdart 
Platinum - Posts: 5,816
Platinum spaceThis member has made a donation to the12volt.com. Click here for more info.spaceThis member has been recognized as an authority in Mobile Audio and Video. Click here for more info.spaceThis member consistently provides reliable informationspace
Joined: January 24, 2004
Location: Pennsylvania, United States
Posted: December 15, 2008 at 6:34 AM / IP Logged  
Yes, I suppose we do.  We know that the gain is not a volume control and so won't be marked like one.  Read through www.bcae1.com for an illustrated explanation.
Build the box so that it performs well in the worst case scenario and, in return, it will reward you at all times.
i am an idiot 
Platinum - Posts: 13,693
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Joined: September 21, 2006
Location: Louisiana, United States
Posted: December 15, 2008 at 8:34 AM / IP Logged  

If you do not want to read through the FEW pages there, here is a link to the particular page Steve was reccomending you look at.

http://www.bcae1.com/gaincon2.htm

DYohn 
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Joined: April 22, 2003
Location: Arizona, United States
Posted: December 15, 2008 at 6:29 PM / IP Logged  
The numbers on the dial are an attempt to correspond to input voltage, but they really mean nothing.  Read and follow the "How to set your gains" sticky post.
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circle of ash 
Member - Posts: 15
Member spacespace
Joined: October 16, 2007
Location: New Jersey, United States
Posted: December 16, 2008 at 12:04 AM / IP Logged  
Well I think I understand, pretty much. I used the gain calculator thing and if my impedance is 2 ohms and my head unit's pre outs are 4v then my gain should be set at 4v which is about halfway. Which I was doing. So I don't understand what I did wrong with my initial set up. If I had my subs that were 4 ohm dvc's with a max rms of 700 watts and my amp was pushing 600 watts per channel at 2 ohms I can't figure out what went wrong. The insulation on the wires were melted and the wires broke away from the cone. Their not cheap subs either. They're polk audio sr124dvc's. Any advice?
reax222 
Copper - Posts: 220
Copper spacespace
Joined: March 11, 2006
Location: United States
Posted: December 16, 2008 at 4:13 AM / IP Logged  
Either a bad batch of wires or too much current/resistance. Even the space shuttle gets a bad wire every once in a while they pay top dollar for everything.
While I understand using the voltage should work, I find a 1kHz tone and 1watt speaker gets me and a then a little work by ear gets me dialed in much closer.
i am an idiot 
Platinum - Posts: 13,693
Platinum spaceThis member consistently provides reliable informationspace
Joined: September 21, 2006
Location: Louisiana, United States
Posted: December 16, 2008 at 6:07 AM / IP Logged  
As stated above the only things that could cause the wires to melt are, too much resistance or too much current.  What usually happens is the tinsel lead begins to break under the insulation, once it starts to break, the resistance increases and then it begins to heat up.  From the heat the glue/insulation begins to melt.  When it melts, there is more stress on the area where the wire meets the cone.  Then a little more of it breaks.  More resistance and heat, once this starts happening, there is really nothing you can do about it.  Most all manufacturers have experienced this problem at one time or another.  Years ago when Matthew Polk owned the company, their speakers were somewhat desirable, since DEI bought the line several years ago, they have become a DEI company.

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