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850 / S70 & V70 '96-'99 / C70 '97-'05 General Forum for the 850 and P80-platform 70-series models |
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left-side car audio weakViews : 1329 Replies : 13Users Viewing This Thread : |
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Mar 3rd, 2023, 08:56 | #11 | |
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Last Online: Yesterday 23:45
Join Date: Jun 2011
Location: Milton Keynes
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A capacitor is two conductors separated by an insulator, DC will not pass through it due to the insulator, but when we apply a voltage to one terminal the charge appearing on one side will induce a charge on the other (in the way of static electricity), in DC that is insignificant but with AC the charge changing on one side will cause the charge to change on the other and the AC voltage shows up on the other terminal, the higher the frequency the more effective this becomes so sound becomes more tinny and less sonorous. If you've got a wire with a poor conductor the AC voltage can thereby jump the gap (with very little current flow), but a proper capacitor uses a relatively large area of two pieces of foil separated by a special insulator rather than the tiny area of the end of a wire with an air gap. I'm scratching about now and this may need to go to a better qualified person but- You could try each signal wire for DC resistance (and compare to the same wire from the right side) although as it appears to be on all left side speakers they may use a common earth return which may be the problem.
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David V70 2.5 10v Torslanda Manual 98 Sreg |
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Mar 3rd, 2023, 11:35 | #12 | |
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Location: Suffolk
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After this I fear your best bet is to check/clean the multipin connectors between door and HU for corrosion from weather ingress. Good luck!
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'98 C70 T5 GT Auto |
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Mar 4th, 2023, 03:30 | #13 | ||
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Last Online: Nov 22nd, 2023 00:04
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Location: McGraw
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Quote:
I thought I had correctly surmised, from the pin diagram, that pin 1 was the ground for all the left-hand speaker pins. But there is 0.00 resistance in the (constantly powered) circuit at pins 1 and 3 (same for the one at pins 7 and 9). Also 0.00 resistance in the (switched) circuit between pins 1 and 8 (same for the one at 7 and 8). Full 12V DC between all these pairs as well. So the ground wires at both pins 1 and 7 seem healthy. If there is any other sort of reading I need to be taking somewhere here, I will jump on it! Quote:
I truly appreciate everyone's willingness to chime in here... Last edited by markthomas; Mar 4th, 2023 at 03:35. |
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Mar 4th, 2023, 08:09 | #14 |
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Last Online: Yesterday 23:45
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Location: Milton Keynes
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I'm afraid I've reached the limits of my fumbling ability on this one so can't suggest any more
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David V70 2.5 10v Torslanda Manual 98 Sreg |
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