Help with new mid/bass driver to B&W CDM1 SE

Hello friend ,
I need to replace the woofer on my B&W CDM1 SE speakers
i want to replace them with other new midbass driver
anyone know which drivers is best alternative for this speaker ?
this is the only CDM1 SE information i found :

Power Handling (RMS): 30W - 120W Watts RMS
Frequency Response: -6dB at 46Hz and 30KHz
Sensitivity (dB): 88 dB
Impedance (Ohms): 8 Ohms

165mm KevlarÃr bass/mid. 6-1/2"

thank you
 
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