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trying to setup my line driver


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joemon 
Member - Posts: 6
Member spacespace
Joined: June 01, 2010
Location: California, United States
Posted: February 23, 2012 at 3:52 PM / IP Logged  
I have a Kenwood deck with 2v outputs
And I bought a hifonics hfeq (4 band eq/line driver) with 9v output.
Amps are mb quart onx4.125 for the highs and hifonics bxi2608 amp for bass.
My question is how do I properly set the gain for the hfeq input and set the output gain to match?
i am an idiot 
Platinum - Posts: 13,667
Platinum spaceThis member consistently provides reliable informationspace
Joined: September 21, 2006
Location: Louisiana, United States
Posted: February 23, 2012 at 9:26 PM / IP Logged  
There has never been an automotive audio amplifier built that would not max out with 2 volts of input.  Who said you needed a line driver?
joemon 
Member - Posts: 6
Member spacespace
Joined: June 01, 2010
Location: California, United States
Posted: February 23, 2012 at 11:22 PM / IP Logged  
Well its a 4band eq with a built in line driver
But it also keeps my gains down on the amplifier and not use as much voltage.
But I'm just wanting to setup the hfeq input levels the proper way so there's no distortion
DYohn 
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Moderator spaceThis member has made a donation to the12volt.com. Click here for more info.spaceThis member has been recognized as an authority in Electrical Theory. Click here for more info.spaceThis member has been recognized as an authority in Mobile Audio and Video. Click here for more info.spacespace
Joined: April 22, 2003
Location: Arizona, United States
Posted: February 24, 2012 at 9:49 AM / IP Logged  

1. Turn gains on amps and EQ all the way down.

2.  Wear hearing protection
3.  Start car and turn on system.  Turn all tone controls and EQ controls to flat, turn off any loudness or other DSp control
4.  Play a 1500Hz test tone in your CD player
5.  Turn up volume on head unit to about 80% of full or until you hear the beginning of clipping (the tone changes.)  Set the volume to just before the sound of clipping begins or 80% if no clipping.
6.  Turn the output on the EQ to max.  Turn up the input gain slowly until you hear the onset of clipping again.  Back it off until the clipping sound clears.
7.  Adjust the gain on your amplifier the same way: turn it up until you hear the onset of clipping, then back it off until it clears.
8.  Turn the head unit volume down to zero.  Insert a music CD that you like listening to.  Turn up head unit volume to your normal listening levels.  If you detect any clipping or distortion, turn the EQ input gain DOWN until it sounds better.  Leave it there.

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joemon 
Member - Posts: 6
Member spacespace
Joined: June 01, 2010
Location: California, United States
Posted: February 25, 2012 at 1:10 PM / IP Logged  
Got it thanx!!
I heard there's a way to do this with a dmm for more accuracy.. do I just take the voltages of rca and match with eq outputs?
DYohn 
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Moderator spaceThis member has made a donation to the12volt.com. Click here for more info.spaceThis member has been recognized as an authority in Electrical Theory. Click here for more info.spaceThis member has been recognized as an authority in Mobile Audio and Video. Click here for more info.spacespace
Joined: April 22, 2003
Location: Arizona, United States
Posted: February 25, 2012 at 1:24 PM / IP Logged  
There is no way to detect line level clipping with a DMM.
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