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Most amps will specify the specific voltage output an amp should have given a certain load. A simple google search will provide this if it is not included in your instruction manual.
Now, dialing in your amp; 1. Download or purchase a CD with test tones recorded at reference level (0db) 2. Disconnect your sub from your amp. 3. Connect a multimeter/voltmeter to the speaker terminal outputs on your amplifier making sure your meter is set to measure DC voltage. Gain on your amp should be at a minimum. 4. Insert media (test tones), and disable any and all sound enhancements as well as equalizer. 5. Depending what your speaker frequency cut-off is, just disable your interior speakers so that only your subwoofer is playing. You could also try setting the cut-off at a higher frequency than the test tone you will playback for your subwoofer. 6. Play said-media at 3/4 max volume, or even a notch above that. 7. While media plays, take note of what your meter displays. Raise the gain until specific voltage is acquired. 8. Turn everything off, hook everything up and you're ready to go as far as your subwoofer goes! Here's a great source for test tones - Realm of Excursion Enjoy! -Freddy Last edited by CREWZIN; 21 Mar 2011 at 05:17 am. |
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I second this for a sticky to the power that be
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I feel that this info is not complete enough to deserve a sticky. He doesn't explain "specific" voltage or the fact that the voltage will be different with every system depending on the rms of the amp or the desired output to match the rms of the speaker being driven.
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Also, the preferred method of setting gains is with an oscilloscope. You can get the maximum output of the amplifier not the "posted" RMS.
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I overlooked that part at first and was in the process of correcting my mistake when you posted. I do agree that this is a way to "safely" adjust the settings for anyone that uderstands how to.
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You do however make a valid point about what the subwoofer will see, since a subwoofer isn't exactly matched to any given amp. Rule of thumb is, in a ported enclosure you can get away with slightly underpowering a subwoofer. Whereas in a sealed enclosure you can get away with slightly overpowering a subwoofer. A very important thing to add to that is, if you're running a ported enclosure make sure you enable the subsonic filter on your amplifier! |
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Kawizx9r; keep up the good work. PEACE! ![]() |
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