MBL 311C4 woofer replacement - Help to identify which woofer to use

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Hi,

I want to replace woofer driver on my MBL 311C4 speaker, but could not identify what the driver it is.

It is a 5 inch mid bass driver, dual voice coil, probably made by Dynaudio, Mid driver is Dynaudio D52AF and tweeter is Dynaudio D21/2, so I think that.

Thanks a lot.
 

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Update status a bit. After could not find original Focal, I could managed to repair the woofer, luckily just a minor issue with coil alignment.
However, I finally decided to adding more woofer to my bookshelf to extend its LF. Really love the sound now.
 

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