Hi guys,
I've got a Fender Passport which has got one woofer distorting. I have ruled out all the possibilities (check by connecting to the two outputs of the amp, connected the driver to another amplifier directly and the driver still distorts).
I have looked for the common causes like tears, coil rubbing, foam rot etc.
I couldn't find any tears or any place which has 'unglued'. I moved the driver gently and can't hear any coil rubbing tapped on the driver and it sounds normal (like a drum).
When I play a sine wave through at very low volume it sounds ok, but as soon as I increase the volume even slightly it distorts and the sine wave sounds like a square wave. I tried gently pressing around the surround while playing the sine wave can't find a 'spot' which makes the distortion go.
I understand the driver is pretty much busted and the only option would be replacement or re-coning, but I would like to know what exactly is wrong any other things I should look for and check?
When it comes to replacement - its a China made Celestion t5919a, I couldn't find any place to source it have send couple of emails yet to hear back. I was only able to find used drivers on ebay.
Also for future reference - would an issue with the crossover network cause this kind of buzz/distortion in the woofer?
Thanks in advance for the help.
P.S I have attached a photo of the place where the cone is glued to the spider - there seems to be less glue at one point, I doubt that this is the problem but that's only what I could find.
I've got a Fender Passport which has got one woofer distorting. I have ruled out all the possibilities (check by connecting to the two outputs of the amp, connected the driver to another amplifier directly and the driver still distorts).
I have looked for the common causes like tears, coil rubbing, foam rot etc.
I couldn't find any tears or any place which has 'unglued'. I moved the driver gently and can't hear any coil rubbing tapped on the driver and it sounds normal (like a drum).
When I play a sine wave through at very low volume it sounds ok, but as soon as I increase the volume even slightly it distorts and the sine wave sounds like a square wave. I tried gently pressing around the surround while playing the sine wave can't find a 'spot' which makes the distortion go.
I understand the driver is pretty much busted and the only option would be replacement or re-coning, but I would like to know what exactly is wrong any other things I should look for and check?
When it comes to replacement - its a China made Celestion t5919a, I couldn't find any place to source it have send couple of emails yet to hear back. I was only able to find used drivers on ebay.
Also for future reference - would an issue with the crossover network cause this kind of buzz/distortion in the woofer?
Thanks in advance for the help.
P.S I have attached a photo of the place where the cone is glued to the spider - there seems to be less glue at one point, I doubt that this is the problem but that's only what I could find.
Attachments
Maybe the voice coil itself has become unglued from the former. This would not be visible without removing the whole cone-spider-coil assembly from the frame.
Ah I see, would that cause the coil to rub? Could it go undetected when I move the cone?
I did and its around 3.8 to 3.9 on both the woofers.
Thanks