Hi,

Try some trouble-shooting methods like change speaker wires between the two speakers to see if the problem remains with the speaker you say has the bad sound or if it moves to the other speaker. If it moves to the other speaker then you can eliminate the speakers as being the problem.

If it remains with the speaker then perhaps something shook loose during transporting them. 

If you gently press the woofers in and then release does it feel smooth or is there some friction (light scraping)?  The woofers do move, right (they are not frozen)?

-sonavor

Thanks for your reply!

I tried changing the cables, i tried using the speakers as speakers 1 as well as speakers 2 on my Beocenter 7002, and I even tried turning the faulty speaker upside down (I read that somewhere). Nothing has helped so far.

The woofer moves, and nothing seems to scrape when I gently press it in.

Oh, and by the way: The sound is equally unclear no matter how I use the bass/treble settings on the Beocenter.

That is strange but if it is always that one Beovox speaker then it has to be internal.
The next step may have to be to open it up and examine the wiring of the signal inside the cabinet.
First looking for a bad connection and second to check for a loose component on the crossover board. 

Do the speaker connections on the cabinet feel solid?
Follow the wire from the cabinet connector to where it goes to the crossover board. 
Check that all of those board components are secure to the board and the wiring is good.
Then check the wiring from the board to the actual speaker drivers.

I can only go by your report that it sounded perfect when you purchased it and that leads me to suspect that transporting it caused something to become loose. If that is all that it is then you should be able to find it and the fix should be pretty easy. A much worse thing would have been if the woofer magnet had come loose. In that case your woofer would most likely be frozen so I think you are good there. Still...when you do open the cabinet take a look at the woofer magnets to check that they are solidly in place. 

-sonavor

I have it open right now. The wirings seem very solid in connections with the board, with the cabinet connector and with the speaker drivers as well. I even loosened the board to check if the wiring looked as solid as it felt. It did.

The magnets seem to be firm in place.

Anything else I should be looking for while it is open?

(btw - your help is really great. As mentioned, I know absolutely nothing about loudspeakers and English isn't my first language, but everything you wrote made sense when I opened the cabinet!)

Can you post individual photos of back of each driver?  Try to capture the label information.  That is so we can verify the drivers are original and correct.
also post photos of the crossover board for each speaker.

Thanks

-sonavor

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I hope this is what you're asking for. Otherwise let me know. Your help is greatly appreciated!

Hi,

Can you measure the tweeter coil?

Your description points at a defective treble unit really. 

As John suggests, try to swap the tweeters from one speaker to the other.

Another thing I will probably suggest is that you replace the axial electrolytic capacitors in the crossover board. Actually both boards but change them out one at a time so you can test the difference. Doing the problem speaker first of course.

Martin (link here on the forum) has Beovox capacitor replacements on the Beoparts store