Bose Amplifier

[cvette98pacecar]

Before you start going crazy and buying equipment and parts plug your front speakers into your rear outlets and see if they work.

[mike100]

Originally Posted by cvette98pacecar

Before you start going crazy and buying equipment and parts plug your front speakers into your rear outlets and see if they work.

great idea-seriously.

I do not own a 90 corvette so I don't exactly know what the wiring harnesses look like, but I heard they are compatible if you solder the wires from the original amplifiers.

[DarkAngel]

Originally Posted by GOLDCYLON

DarkAngel as stated SCHRADE is right start with the basics make sure power is getting to the speakers/amps. As to your English it's better than my French lol and as SCHRADE stated we just want to make sure no details were lost in the translation.

If that checks out the radio brain behind the passenger seat on your 90 is the next logical suspect as stated by xlr8florida and Dr dons is the best choice for repair. GC

the front surely has power because when i start the radio, it makes "tac, ... tac, ... tac" from the front speakers

cvette98pacecar; great idea
i didn't thought of that
i will try to put the front speaker in the back and the back in the front next we to see what's going on

[scottfab]

Originally Posted by DarkAngel

the front surely has power because when i start the radio, it makes "tac, ... tac, ... tac" from the front speakers

cvette98pacecar; great idea
i didn't thought of that
i will try to put the front speaker in the back and the back in the front next we to see what's going on

You do have some sort of power to the front but it may not be going where it should, thus the tac tac tac sound.

If your going to swap speakers rather than measure a few voltages then I'd
swap a single know good rear one to the front not the suspect front one to the rear since that is the one you modified.
You could avoid damaging the rear pre-amp depending on what the wiring error is (if there is one) in the front one.

[DarkAngel]

Thanks everyone for your help
i unmount the amplifier again and use this schema to see what's going on



as you said, the wire are differently on late 90 amplifier and early 90
the audio out and +12V are inverted

i've changed the wire and now it works !

Thanks again

[scottfab]

Originally Posted by DarkAngel

T
...snip...

as you said, the wire are differently on late 90 amplifier and early 90
the audio out and +12V are inverted

i've changed the wire and now it works !

Thanks again =D>

I'm very glad all worked out for you.
Now you can test the volume control that is connected to
the fuel peddle. The louder you want the music the more you need
to accelerate

[Schrade]

What is this schematic?

There are no Right Channel grounds represented?

Is this the Bose Head Unit? There are 3 separate logic boards in the Bose Head Unit. Is this the Mainboard of the 3?

I have a partial Bose Head Unit Schematic here:
http://www.zr1.net/forum/showthread.php?t=19620

Originally Posted by DarkAngel

Thanks everyone for your help
i unmount the amplifier again and use this schema to see what's going on



as you said, the wire are differently on late 90 amplifier and early 90
the audio out and +12V are inverted

i've changed the wire and now it works !

Thanks again =D>

[mike100]

It is the speaker amp schematic.

[Schrade]

Originally Posted by mike100

It is the speaker amp schematic.

Are the voice coils represented in it there Mike? Are there cross-overs represented for band filtering? Which symbol is it IS there even band filtering?

[mike100]

The schematic isn't complete, but there is tuned L/C on the board- which is more or less tuned to the speaker size. You can't do anything with these except repair them. It's a lot more economical to go aftermarket if everything on the bose has gone bad (there's a tuner box separate or the head unit, then the 4 amps driving proprietary 1 ohm speakers).

As you have no doubt seen on other links to posts, the Nissan units are newer improved versions of the late c4 amps and are a dime-a-dozen and are a cheap way to keep the factory unit going if you like the oem look.