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Thread: Setting gain with DMM... |
    
Silver Member Username: Killer44
Ontario
Canada
Post Number: 755
Registered: Dec-04
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| Posted on Thursday, December 14, 2006 - 11:15 pm: |
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so ive always done it by trying to get the dial to what i though was the right spot but i have 2 dmm's so i figured why not learn the right way to set the amps gain, so if neone could explain me how to do it or nething like that i would greatly appreciate, alos if i dont know the range for the gain on an amp how would i found it out...the site doesnt have it listed and i dont have a manual, its a PA 0V2-300, gunna use it temporarily for my g/fs system so i jsut want to know how to set the gain correctly for ne system i do...thanks alot
http://www.poweracoustik.com/pa2006/product_AUDIO_amp_gothic.htm |
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Silver Member Username: Killer44
Ontario
Canada
Post Number: 757
Registered: Dec-04
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| Posted on Thursday, December 14, 2006 - 11:44 pm: |
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http://www.caraudio.com/forum/showthread.php?t=63933
i found this tutorial alittle further down, it helped out alot, i understand how to do it now, but what do they mean by turn all procesors off on ur h/u, does this mean turn off lpf ?...however i would still like to know about how to find out the gain range on the PA OV2-300..thanks in advance |
Gold Member Username: N2audio
Lawrence,
Ks
USA
Post Number: 1052
Registered: Mar-04
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| Posted on Friday, December 15, 2006 - 12:01 am: |
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if you're powering something other thans subs download the 0dB 1000hz test tone from realmofexcursion.com If you're powering a sub download the 50hz 0dB tone. Burn them to cd.
As long as your x/o's are set appropriately for the type of speaker (and tone) you don't have to disable them.
Turn off your bass boost (hu and amp) set the bass and treble to zero on the HU.
Disconnect your speaker wires from the amp. Put the cd in and play the appropriate tone on repeat.
Measure the voltage at the amp.
If you're running it in stereo --
It's rated 70x2, to be safe, assume it's slightly over-rated, let's call it 60x2.
Using the formula sqrt(PxR) you get sqrt(60x4)= sqrt(240)= 15.5v
Adjust the gain until you get 15.5v. It will be hard to get EXACTLY 15.5. Anything between 15-16v should be fine.
If you're running the amp bridged it's rated at 170w. Call it 150w to be safe.
In that case it's sqrt(150x4)=Sqrt(600)=24.5v
That's all there is to it. |
Silver Member Username: Killer44
Ontario
Canada
Post Number: 759
Registered: Dec-04
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| Posted on Friday, December 15, 2006 - 12:11 am: |
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thanx alot opti thats helps out alot, so one last question i wanna set my a8002t and i got it running at 400@2ohms per channel, so i would set them seperately, using sqrt(400x2)=28.28...v....is that the correct way to do it for a 2 channel amp when using both channels seperately...? |
Silver Member Username: Killer44
Ontario
Canada
Post Number: 760
Registered: Dec-04
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| Posted on Friday, December 15, 2006 - 12:12 am: |
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didnt bump... |
Silver Member Username: Killer44
Ontario
Canada
Post Number: 761
Registered: Dec-04
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| Posted on Friday, December 15, 2006 - 12:19 am: |
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wait the two channels share the same gain i think...so how i would i do it?...i got them hooked up to seperate channels, but would i jsut do sqrt(800x4)=...b/c its rated that a 4ohms bridged?... |
Gold Member Username: N2audio
Lawrence,
Ks
USA
Post Number: 1054
Registered: Mar-04
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| Posted on Friday, December 15, 2006 - 12:55 am: |
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if you have it at 2 ohms stereo.
sqrt(400x2)= sqrt(800)= 28.3
probe either channel using the appropriate tone, adjust the gain until you get ~28v. |
Gold Member Username: Safe_cracker
Chicago,
IL
US
Post Number: 2183
Registered: Jan-06
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| Posted on Friday, December 15, 2006 - 01:14 am: |
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http://www.subwoofertools.com/forum/setgain.asp |
Silver Member Username: Killer44
Ontario
Canada
Post Number: 762
Registered: Dec-04
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| Posted on Friday, December 15, 2006 - 11:58 am: |
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thanx alot opti and polo that helps out alot... |
