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setting gains with a DMM help
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<blockquote data-quote="rodneypierce" data-source="post: 7642163" data-attributes="member: 639381"><p>Slap me silly and call me sally. Im such a newb //content.invisioncic.com/y282845/emoticons/furious.gif.fc81ca146dbff91fede3ed290dbc4f4c.gif:furious:! Tonight, I tore the back seat out, to gain access to the speaker terminals. I used a different test tone then the last one, and directly from the USB instead of burned to a CD. Started out measuring everything again, sub was actually very close to where it was supposed to be. The rear's were low, so I brought them up to where they were supposed to be. Ended up about 3/4 of the way up and the fronts were only putting out 1.5 volts..... I checked and checked, and could only get a max of 2.2 out of channels 1 and 2. I looked at the crossover and I had it flipped to high pass, instead of full. Flipped it over to full and bam. 14.8 volts. (again, stupid newb mistake).</p><p></p><p>Plugged the speaker wires all back in, and turned it up to about 80% of max volume (where I set the voltages at, 65 on the volume control) and could audibly hear some distortion, so backed the gains on channels 1-4 back down about .5 volts under the calculated, and they sound clean as can be! Sub is kicking good as well! Went back through all of the crossovers and reset everything. Spent some time on it tonight.</p><p></p><p>I have the fronts set at 125hz with a 18db slope, the rears set at 100hz with a 12db slope, and the sub set at 80hz passive. Sounds really good!</p><p></p><p>Only thing I have to do now is figure out this noise issue. I have a hissing white noise all the time when there is no music. Like in between songs, or at the start of a CD or the USB search. Then I have a horrid alternator whine as well. I regrounded the HU tonight, with a wire from the case, directly to the chassis, and still have both noises. Only thing I can think of it that the RCA's are causing it.</p><p></p><p>The amp has a dedicated ground on the chassis, by the rear strut tower. I sanded and cleaned the surface prior to installing it, so it should be good to go. Only other thing is the RCA's. They are cheap ones anyhow, so might be time to upgrade them here in the near future, and move them all over to the drivers side, farthest away from the power wire as I can get.</p></blockquote><p></p>
[QUOTE="rodneypierce, post: 7642163, member: 639381"] Slap me silly and call me sally. Im such a newb [IMG]//content.invisioncic.com/y282845/emoticons/furious.gif.fc81ca146dbff91fede3ed290dbc4f4c.gif[/IMG]:furious:! Tonight, I tore the back seat out, to gain access to the speaker terminals. I used a different test tone then the last one, and directly from the USB instead of burned to a CD. Started out measuring everything again, sub was actually very close to where it was supposed to be. The rear's were low, so I brought them up to where they were supposed to be. Ended up about 3/4 of the way up and the fronts were only putting out 1.5 volts..... I checked and checked, and could only get a max of 2.2 out of channels 1 and 2. I looked at the crossover and I had it flipped to high pass, instead of full. Flipped it over to full and bam. 14.8 volts. (again, stupid newb mistake). Plugged the speaker wires all back in, and turned it up to about 80% of max volume (where I set the voltages at, 65 on the volume control) and could audibly hear some distortion, so backed the gains on channels 1-4 back down about .5 volts under the calculated, and they sound clean as can be! Sub is kicking good as well! Went back through all of the crossovers and reset everything. Spent some time on it tonight. I have the fronts set at 125hz with a 18db slope, the rears set at 100hz with a 12db slope, and the sub set at 80hz passive. Sounds really good! Only thing I have to do now is figure out this noise issue. I have a hissing white noise all the time when there is no music. Like in between songs, or at the start of a CD or the USB search. Then I have a horrid alternator whine as well. I regrounded the HU tonight, with a wire from the case, directly to the chassis, and still have both noises. Only thing I can think of it that the RCA's are causing it. The amp has a dedicated ground on the chassis, by the rear strut tower. I sanded and cleaned the surface prior to installing it, so it should be good to go. Only other thing is the RCA's. They are cheap ones anyhow, so might be time to upgrade them here in the near future, and move them all over to the drivers side, farthest away from the power wire as I can get. [/QUOTE]
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