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Help Troubleshooting Sub with No Sound
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<blockquote data-quote="easterbran" data-source="post: 8663605" data-attributes="member: 676138"><p>Update on the troubleshooting... I am still stumped:</p><p></p><ul> <li data-xf-list-type="ul">Sub is receiving 12.6V + to the Power terminal, and 12.3V + to Remote Turn-On terminal. The sub turns on and off with the car, as expected, and I hear a faint pop coming from the sub. Power LED lights up Red.<br /> <br /> </li> <li data-xf-list-type="ul">Playing music, I see 0-0.2V AC on both RCA cables coming from the LOC. Playing a 50 Hz test-tone, I see 0.3V AC on both RCA cables. So there is definitely some signal coming through them (as there should be, these are brand new cables).<br /> <br /> </li> <li data-xf-list-type="ul">I didn't like the way one of the Female RCA jacks looked (see pic) and it was difficult to get a good contact with the RCA male pin. The one on the right is the old one, and you can see how the conductive material is recessed waaaay deeper into the socket than the new socket on the left (you can see the gold conductive material right at the edge of the hole on the left one). I soldered in the new female RCA and verified that connections were good with the DMM.<br /> <br /> </li> <li data-xf-list-type="ul">I went through all wiring, capacitors, Gain potentiometer, FETs, etc. inside the subwoofer amp with the DMM and found nothing wrong. All solder joints looked good, no bulging capacitors, nothing.<br /> <br /> </li> <li data-xf-list-type="ul">I connected a 9V battery across the sub speaker and it moved noticeably, so the speaker is not blown.<br /> <br /> </li> <li data-xf-list-type="ul">I then sanded the unpainted area that I had previously used for Ground, as well as the washer I used between the sheet metal screw and ring terminal. The connection to Ground is rock-solid and clean.<br /> <br /> </li> <li data-xf-list-type="ul">I double-checked the sub's amp fuse, inline power fuse, all fuses in my car related to radio, and they were all fine.<span style="color: #c0392b"> I did notice that my rear right speaker is not working, but this shouldn't matter since the LOC is tapped into the front speakers.</span><br /> <br /> </li> <li data-xf-list-type="ul">The only settings on the factory headunit allow for Bass, Treble, Fade, and Balance. I tried every combination of these possible, as well as messed with my phone (audio source) equalizer settings with no luck.<br /> </li> </ul><p><span style="color: #27ae60">The last thing to try, suggested to me on Reddit, is to pick up a 3.5mm to RCA adapter and try playing my phone through the sub directly. If that works ok, then I need to check my RCA cables and LOC connections behind the headunit.</span></p><p></p><p>Please let me know if anyone has any other things to try.</p><p></p><p>[ATTACH]3085[/ATTACH]</p></blockquote><p></p>
[QUOTE="easterbran, post: 8663605, member: 676138"] Update on the troubleshooting... I am still stumped: [LIST][*]Sub is receiving 12.6V + to the Power terminal, and 12.3V + to Remote Turn-On terminal. The sub turns on and off with the car, as expected, and I hear a faint pop coming from the sub. Power LED lights up Red. [*]Playing music, I see 0-0.2V AC on both RCA cables coming from the LOC. Playing a 50 Hz test-tone, I see 0.3V AC on both RCA cables. So there is definitely some signal coming through them (as there should be, these are brand new cables). [*]I didn't like the way one of the Female RCA jacks looked (see pic) and it was difficult to get a good contact with the RCA male pin. The one on the right is the old one, and you can see how the conductive material is recessed waaaay deeper into the socket than the new socket on the left (you can see the gold conductive material right at the edge of the hole on the left one). I soldered in the new female RCA and verified that connections were good with the DMM. [*]I went through all wiring, capacitors, Gain potentiometer, FETs, etc. inside the subwoofer amp with the DMM and found nothing wrong. All solder joints looked good, no bulging capacitors, nothing. [*]I connected a 9V battery across the sub speaker and it moved noticeably, so the speaker is not blown. [*]I then sanded the unpainted area that I had previously used for Ground, as well as the washer I used between the sheet metal screw and ring terminal. The connection to Ground is rock-solid and clean. [*]I double-checked the sub's amp fuse, inline power fuse, all fuses in my car related to radio, and they were all fine.[COLOR=#c0392b] I did notice that my rear right speaker is not working, but this shouldn't matter since the LOC is tapped into the front speakers.[/COLOR] [*]The only settings on the factory headunit allow for Bass, Treble, Fade, and Balance. I tried every combination of these possible, as well as messed with my phone (audio source) equalizer settings with no luck. [/LIST] [COLOR=#27ae60]The last thing to try, suggested to me on Reddit, is to pick up a 3.5mm to RCA adapter and try playing my phone through the sub directly. If that works ok, then I need to check my RCA cables and LOC connections behind the headunit.[/COLOR] Please let me know if anyone has any other things to try. [ATTACH]3085._xfImport[/ATTACH] [/QUOTE]
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