Noon questions

[Elfriede]

Hi guys

I am new to speaker DIY
I got two old Fostex 103 (not Sigma) labeled with Dynaco free. The guy said the mighty need some refurbishment.

It seems the speakers are broken or do I do something completely wrong?

What did I try?
I took a small amplifier and a Pc with spotify. I hooked up the amp with the speakers . The amp is switched off. Switch on the amp. Press play. The speaker's membrane are not moving

Plugged off again everything
I checked the membrane, softly trying to press a bit downwards but the membrane doesn't move at all

Is the speaker completely broken or do i do something wrong

Thanks for help

 

[Netlist]

There's a good chance the voice coil is burned.
A few nice examples near the bottom of the page here:
https://sound-au.com/articles/speaker-failure.html

Hugo

 

[Elfriede]

Seems like that’s the issue

 

[adason]

Ask mods to change your thread title 🙂

 

[Elfriede]

There's a good chance the voice coil is burned.
A few nice examples near the bottom of the page here:
https://sound-au.com/articles/speaker-failure.html

Hugo

Thank you

 

[Dieter Geissel]

Did you check the resistance of the coil?
Should be about 7,1 Ohm.

 

[Elfriede]

Hi Dieter @Dieter Geissel

Thank you, it is as @Netlist already gave a hint, the voice coil is burnt. The membrane cannot be moved anymore
I cannot even measure the resistanc (or impedance) of the voice coil anymore.

Christian