Gain with DMM
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Silver Member Username: Audiobahn_manFreakmont, MI Post Number: 286 Registered: Aug-04 | How would I go about checking to see if my gain is set right with a DMM? Do I look for voltage drop? Bit confused. Rockford Fosgate T112d2 Precision Power 1000/1 4 gage power/ground Kenwood Deck http://www.kenwoodusa.com/Car_Entertainment/In-Dash_CD_n_DVD_Receivers/1-DIN_CD_ Receiver/KDC-X693 it says it has 3 4v preouts, anyone know what that means? Any help would be amazing! |
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Silver Member Username: Audiobahn_manFreakmont, MI Post Number: 287 Registered: Aug-04 | http://i76.photobucket.com/albums/j23/steveo200077/RMSchart.jpg Is this accurate? |
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Platinum Member Username: Nd4spd18Philadelphia, PA Post Number: 10384 Registered: Jul-06 | http://web.archive.org/web/20080104010047/http://www.subwoofertools.com/forum/se tgain.asp The disconnect speakers part is very important, You get download a 50 hz test tone to use from realmofexcursion.com |
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Silver Member Username: Audiobahn_manFremont, MI Post Number: 290 Registered: Aug-04 | Thanks man that was the link I was looking for! |
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Silver Member Username: Audiobahn_manFremont, MI Post Number: 294 Registered: Aug-04 | Went to the local electronic store and bought one for $10. Set the gain on a 45Hz tone to 24.5v (Gain is at about 2/3), it sounds awesome, nice and loud with no distortion what so ever. Only question I had was how the hell do I know for other songs how loud I can turn it up before the amp clips?? Also, is there a volt meter that I can run up to the dash of my car? |
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Platinum Member Username: Nd4spd18Philadelphia, PA Post Number: 10391 Registered: Jul-06 | It will never clip if you set it with the DMM. That test tone puts more "stress" on it than any song can to put it simply. |
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Gold Member Username: Tatonka-[Team Audible Insanity]- Post Number: 2931 Registered: Mar-07 |
You will clip at some of the lower frequencies than you set your gain at. When you set your gains with a DMM, there is no stress on the amp at all since there is no load on it. If you have ever clamped an amp while setting gains with a multimeter, you will see that there is basically no current draw. The lower the frequencies you play, the closer you get to your nominal load. This is explained in this video: http://www.youtube.com/watch?v=SmkWY1e68P8 Sure, the DMM is a good way for a newbie to set his/her gains. But in the end, you will end up using your ears. |
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Silver Member Username: Audiobahn_manFremont, MI Post Number: 300 Registered: Aug-04 | When I set the gain by ear it was about 2-3v high of what the DMM said. One other thing I did notice is that my power/ground voltage going into the amp was 30v. Is that normal? Also when I crank that test tone to when I set the gain I get about a 2v drop off while the tone is playing. Everything still safe? |
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Gold Member Username: Tatonka-[Team Audible Insanity]- Post Number: 2932 Registered: Mar-07 |
It can vary depending on how good you are.
Whattt? It should be 12-14 DC volts. Make sure you have the DMM set on DC. |
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Silver Member Username: Audiobahn_manFremont, MI Post Number: 301 Registered: Aug-04 | Ahh that would be the problem lol..whoops |
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Gold Member Username: Tatonka-[Team Audible Insanity]- Post Number: 2933 Registered: Mar-07 |  |
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Gold Member Username: Big_edge_headMilwaukee, WI Post Number: 3824 Registered: Mar-07 | lol sounds like something snow would do. |
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Gold Member Username: Snowball123West Allis, WI Post Number: 2693 Registered: Oct-07 | you're right steve. haha. |
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