B&W DM602 series differences

[Slowtwitch]

I'm trying to find reviews on the Bower & Wilkens DM602's.

Can anyone shed some light please on the differences between the DM602, DM602 S1, S2 , S3's

Is there a real world difference in sound/ quality and maybe a timeline of when the different models came on the market

 

[Slowtwitch]

 

[gbyleveldt]

 

[user 997]

 

[croak]

 

[Raffs]

 

[ghostinthemachine]