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740 Estate (1986) Rear speaker mystery..

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Old Jun 28th, 2020, 15:42   #1
mfarmitage
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Default 740 Estate (1986) Rear speaker mystery..

Happy Sunday all, so i have installed a new stereo and was pleased to see there was wiring for rear speakers at the head unit. However, no sound was coming from the rear so upon investigation i see there are no speakers in the rear doors.

I thought oh well if i cut out the vinyl the wire must have been waiting behind for 34 years to be plugged in, however, after i cut into the vinyl i can't find the wire?

I notice there is a red knockout (quite robust) panel there though, has anyone found wires behind this knockout panel?

Thanks

Michael

Pic of panel below20200628_143115.jpg
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Old Jun 28th, 2020, 17:38   #2
Laird Scooby
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You have a few choices now.

First, build some custom enclosures in the back (above the cubby holes behind the rear arches is where i'd suggest ) and fit a pair of 6x9s or similar larger speakers. Run dedicated speaker wire to these.

Second is find a pair of extra slim 5.25"/13cm door speakers and fit them in your rear doors, again running dedicated speaker wires for them.

Third is a normal pair of 5.25"/13cm speakers, drill out the spot welds on the blanking panels in the rear doors and remove the blanking panels. If the wiring is hidden back there (usually it's folded back and taped to the rest of the loom so might need some hunting) connect it and see what you've got. You may still need to run separate wires though.

I've not had a 7xx without the rear door speakers so no idea if they fitted the wiring on models that didn't have rear speakers. However, how often do you have rear seat passengers? If the answer isn't often, i'd go for the custom enclosures at the back of the car. Simple reason being, the rear speakers in the door don't contribute greatly to what you actually hear - there are two big seats directly in front of them to instantly muffle their output!

I have a pair of 6x9s that i keep meaning to fit and wire up at the back, perhaps through an amp (nothing lairy like a mega-watt amp, just enough to give a bit more oomph from the back) to give a better all-round music image.

Good luck, whichever way you do it!
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Old Jun 28th, 2020, 21:37   #3
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When you say rear speakers do you mean in the D pillar?

If so then my newest breaker has D pillar speakers so I can supply everything.
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Old Jun 28th, 2020, 21:55   #4
Laird Scooby
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Not on a 1986 745 Luke, they were lucky to get 4 speakers!

They were all in the doors (although somehow some got dashboard mounted speakers - tweeters i think, as well) but your idea might be a nice upgrade.
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