Car Speakers how to find where fault is -

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Morgenmuffel

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#171649 26-Apr-2015 18:02

Ok doke

Went to install Headunit in SWMBOs car, noticed that the the left font speakers weren't working (before I started the install) there is a left front door speaker and one that is in the pillar thing above the glove box, neither were working, I checked the wiring (behind the headunit) visually when i put the new headunit (in just used an ISO adapter), but it all seemed hunky dory, so put the new head unit in and evrything except those front left speakers worked, so before I pull the door panel off, is there an easy way to find where the fault is

The car is a Nissan Avenir

Cheers

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Stu

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#1291814 26-Apr-2015 18:20

If I read what you've said correctly, it sounds like the setup is mid in the door with a tweeter on the pillar?

If so, have a hunt between the head unit and the door (follow the loom) and hopefully you'll find the crossover box. Should be just behind the kick panel in the foot well, or just above the glove box. Picking there's an issue at the crossover.

It may also be in the door itself!

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Keep calm, and carry on posting.

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Jase2985

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#1291817 26-Apr-2015 18:26

i would suspect that the fault would either be behind the speaker or where it goes from the car to into the door, the bit that moves when the door opens/closes.

Morgenmuffel

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#1291827 26-Apr-2015 18:48

Whoops

I knew i forgot something, this is wired into the aerial, is it

a) some sort of aerial amp
b) A band expander thingie

And what will be the effect of leaving it, now that i have put in an NZ headunit

'We love to buy books because we believe we’re buying the time to read them.' WARREN ZEVON

Jase2985

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#1291829 26-Apr-2015 18:50

band expander, no need for it if you have a NZ head unit

Morgenmuffel

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#1292289 27-Apr-2015 15:39

Will it cause any issues if I dont take it out?

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Jase2985

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#1292385 27-Apr-2015 18:36

just bypass it

it may add 14mhz to the nz frequencies

lxsw20

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#1292467 27-Apr-2015 19:43

I'd have a look around the door hinge for issues. It's possible the speaker cable goes into the door, the has a basic x-over then back to the tweeter.

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RUKI

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#1292723 28-Apr-2015 08:59

The simple, easy and efficient way to check where the fault is, without powering anything. Also use this to phase (check polarity) bass spekers (otherwise if not phased - you'll experience loss in the output at the lower range):

- Use 1.5 V battery (AAA, AA will do).
- Disconnect wires from the amplifier/sound sustem which are going to the speakers.
- Connect/Disconnect temporarily quickly 1.5V to one pair, e.g. right speaker - you'll hear "click"/"unclick" sounds and observe bass speaker diafragm moving in certain direction - out or in (that is how you define polarity of speakers,.. mark the (+))
- Do that with left - if speaker is OK - your device has fault on the left channel. If not clicking - try to cut into wires somewhere closer to the door, where you think the wires may have been damaged or interconnected (no continuity).

trig42

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#1292730 28-Apr-2015 09:12

If neither speaker (tweeter in the pillar or speaker in the door) are going, then the issue lies between the headunit and the crossover. The crossover is probably sitting in the door (Assuming, that like my Nissan Skyline, the tweeter is also in the door) and it is quite possible the wiring has disconnected from the crossover.

Just a question on the Nissan, what brand of stereo did you remove? Was it a Bose? If the car has Bose speakers, you may want to look at replacing them. they are only 1 ohm speakers, which mean they go loud, but if your amplifier isn't expecting a low resistance, they can cook it. Most after-market stereos want speakers in the 2-8 ohm range. Also, if it was a Bose, the speakers are probably wired to a Bose Amp in the boot (Mine was), it may be easier to track down your door speaker issue by running a new speaker cable.

Morgenmuffel

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#1292927 28-Apr-2015 13:01

Cheers Guys,

the old head unit was a Nissan PY560 like the below

http://yahoo.aleado.com/lot?auctionID=w110504537

As for the speakers i think they were replaced a couple of years ago after they developed a good awful hum (its SWMBOs car) so i am not 100% sure on that.

I'll get on to the rest of the testing later in the week.

Cheers

'We love to buy books because we believe we’re buying the time to read them.' WARREN ZEVON

richms

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#1292952 28-Apr-2015 13:48

Morgenmuffel: Will it cause any issues if I dont take it out?

Yes, you will get all its intermodulation mess that it creates in the process of downshifting stationsby 14 MHz, making things a lot worse than they would be without it.

Of cource, if you never use the radio then it will not matter.

Richard rich.ms