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700/900 Series General Forum for the Volvo 740, 760, 780, 940, 960 & S/V90 cars |
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Radio wiringViews : 2521 Replies : 43Users Viewing This Thread : |
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Dec 10th, 2019, 12:25 | #11 |
bob12
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I don't have any experience of a CR(cassette radio) 906 but I do in respect of the 702 and 708. At the least the oem of the 7's was Alpine, Japan.
The 7's did not have a powerful inbuilt amp unlike modern head units and that was the primary reason for the front and back door speakers being fed via din plugs from the head unit to the separate under dash amp (from where the door speakers are fed directly via loom wiring). The 7's also had a separate speaker output that was fed via the wiring loom to small speakers on the top of either side of the dash which were only fitted to 'select' models in the range. There are no other outputs on the back of the 7's other than these two. Bob |
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Dec 10th, 2019, 14:51 | #12 | |
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Dec 10th, 2019, 15:04 | #13 | |
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If you have an output to the dash mounted tweeters, theory says if you run a bit of speaker wire from each of those to the door speakers, you'll hear something. Usually tweeters are supplementary to the door speakers and have a passive crossover (usually just a capacitor in series with the tweeter) but it could be Volvo have done things differently. It might even be they're not even tweeters as most people understand them but simply fill-in speakers. Usually the door speakers are full range units in the doors.
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Dec 10th, 2019, 17:42 | #14 | |
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Dec 10th, 2019, 21:37 | #15 | |
bob12
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For instance, currently my door speakers all round on my all singing and dancing modern head unit in my '90 745 (using the original wiring) are playing up and randomly cutting out at times. To remedy I just have to just tap the top of the electric door mirror switches/movers and bingo sound is restored!! Bizarre!! The final fix will be revealed, I am sure, when the door cards are removed but, not until next Summer! Bob |
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Dec 10th, 2019, 21:41 | #16 | |
bob12
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Dec 10th, 2019, 21:49 | #17 | |
bob12
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Dec 10th, 2019, 21:58 | #18 |
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Speakers on my last 740 had no cones left Bob, just rotted away. Two of the speakers on this 760 were the same. All cones were split/damaged/missing on both cars though.
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Dec 10th, 2019, 22:46 | #19 |
bob12
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As I was trying to say ... you gotta start getting a bit brutal to find out where the usually simple solution to a problem like resides. Bob
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Dec 13th, 2019, 13:33 | #20 |
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So I think I found the reason the front door speakers not working... they simply aren't there!
Taking the door card off completely showed the wires glued on the door behind! Only issue is these have no power to them, tried a 6x9 speaker which is big but I had one to hand and nothing from it. I checked continuity from the amp and there is continuity. What could be the cause for no power, amp not putting anything out? What is the output of the amp too, I plan on getting some speakers but not sure what output the amp gives. Last edited by ANDTWENTY; Dec 13th, 2019 at 13:46. |
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