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Bass units from the LCR60  [120mm diameter]  these have a magnetic shield plate on the back.

These may well be the same as the DM600 s3 bass unit [ PLEASE satisfy yourself of this before purchase]. Just check that the magnetic shield plate isn’t a problem on say a DM600 s3 and that there is enough space behind/inside.

The LCR60 came with the DM601 s3- but the 601 has a larger bass driver ~165mm so these will not fit

Addendum:  I have added another pic to show the size- just in case there was a similar model with a larger  woofer size or for compatibility.   The outer edge of the rubber surround is 120mm across as shown.