Yes, it's not a scratching noise, sounds pretty much metallic. I didn't try to open the box yet, not even sure it's possible without having to break it apart. From the front, only the normal movement of the membrane is visible.
Just making sure, as long as the speakers are in passive mode, the capacitors etc are "safe" to touch, right?
I'd want to dismount the tweeter and try to pop the membrane back into spherical form. Would that be a bad idea?
Tricky - I would try to do it from the front, using a small needle to grab the dome.
Hmm, without piercing it, though? I'm not sure how this one works but I can't imagine it would like a hole pierced into it to grab the dome.
I thought it would be possible to push the dome from the inside, but the thing looks solid...
I have an old system of stereo speakers of mostly a nostalgic value (my dad had them when I was a kid) that started showing the following behavior: on heavy bass, one of the speakers produces clanging noises as if the speaker is hitting something from the vibration.It only really affects one of the speakers and only on really heavy bass. I don't know anything about speaker's internal workings but could it be that some kind of mount loosened over time and is not holding the speaker in place? Or is it just "normal" wear and tear and there is nothing to be done?
edit: ok, so I took the backplate from the working speaker, and put it into the defective one - the same thing happens. Now it's not a metallic sound anymore though, it sounds like two pieces of rubber or plastic rubbing on each other. As if putting the backplate on causes the bass to become too strong and it's pushing the membrane in recoil... or something
If you move the woofer in & out (carefully) by hand, do you hear/feel any rubbing? Sometimes a woofer can sag out of alignment and you can get rubbing of the voice coil (or voice coil form) in the magnet gap.
I don't really get why the noise only comes back with the speaker box completely assembled...
...I doubt it's worth replacing it though, I know too little about driver characteristics in general and finding out the exact specs is a bit hard.
Yes, I did both, no change. So it's probably a defective driver.