SPEAKER drivers health identification

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hallo friends
i am srinivas from india
i purchase a desecent set of B&W DM320 as a second hand set from a local guy.
the sound i am getting is ok but not what i expect from a B&W .
IAM using HK AVR65 as an amp
any body tell me how to identify whether the drivers are healthy or faulty even though it is sounding good?
i have a doubt that the polarity of the speakers are not correct,how to confirm it?drivers having markings but the cables coming from crossover are not colour coded (onepair blue+brown and second pair yellow +white) tweeter connections are ok ie red(+) and black(-) and connected to tweeter properly,my doubt is only with two woofers,because the pair is already opened before my purchase.
the speakers are three way 1"dome tweeter+two 8"drivers.
any suggetions
thanks
srinivas
 
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