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Is this the right way to set amp gain?


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mrdragon 
Copper - Posts: 121
Copper spacespace
Joined: October 08, 2003
Location: Australia
Posted: January 08, 2005 at 9:04 PM / IP Logged  
Hi guys,
Can i ask is this the right way to set my car amp???
My sub rated @ 400RMS into 4 Ohms
So 400 X 4 = 1600
And.....Sqt of 1600 = 40
So i can use the Mutilmeter and set my amp gain upto 40 and i will be safe from damaging my sub right???
Cheers :)
phuzun 
Member - Posts: 26
Member spacespace
Joined: July 06, 2004
Location: United States
Posted: January 08, 2005 at 10:03 PM / IP Logged  
I think the best way is to use an oscilliscope and just put it at the max without clipping.  You could just use your ears if you cant afford or dont have access to one. 
bullman96 
Silver - Posts: 294
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Joined: October 03, 2004
Location: United States
Posted: January 10, 2005 at 1:02 AM / IP Logged  
the multimeter method is fine as long as you listen well and make sure there is no mechanical strain on the sub. 400rms is what the voice coil can take, the box will determine how much the rest of the sub can take. use the multimeter to set the max the amp can supposedly put out before it clips if the rms is the same as the sub, and then turn down from there by ear. an oscilliscope is best though
DYohn 
Moderator - Posts: 10,741
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: January 10, 2005 at 1:23 PM / IP Logged  
Actually you should not use the speaker RMS power rating, but the amplifier's.  What's the RMS output of your amp?
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mrdragon 
Copper - Posts: 121
Copper spacespace
Joined: October 08, 2003
Location: Australia
Posted: January 10, 2005 at 9:16 PM / IP Logged  
My sub RMS is: 400
and my amp can produce 150RMS BRIDGED!
Thanks :)
DYohn 
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Joined: April 22, 2003
Location: Arizona, United States
Posted: January 10, 2005 at 10:07 PM / IP Logged  
Then the max output from your AMP should be set for 150 watts.  At 4 ohms, that would be approx. 24.5 volts AC (using a 0db test tone at, say, 60Hz and max non-clipping output volume from your head unit.)  If you were to try to get 40 volts from that amp, you'll be clipping like crazy.
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mrdragon 
Copper - Posts: 121
Copper spacespace
Joined: October 08, 2003
Location: Australia
Posted: January 11, 2005 at 12:58 AM / IP Logged  
Ok thanks DYohn :)
i also wanted to know does it worth the upgrage to buy a 500RMS amp for my Pioneer TSW305C, this sub can handle 400RMS.
Currently i use 150RMS to run it, but don'w know how much diff will there be after the upgrade, just don't want to spend on the money if it's not worse it!
Cheers :)

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