I recently bought a pair of B&W DM601 S3 speakers on eBay. Even though they are in excellent shape and sound great, I thought I would take a look at the crossovers to see if any of the components might need upgrading. When I opened them up, I was delighted that there were no electrolytic capacitors or iron-core inductors to be found inside. The capacitors are nice looking metal film units and the inductors are nicely made air-core pieces. I don't know how good the resistors are but, like the capacitors, they have the B&W brand on them, so they might be good. In addition, all the components were securely glued to the circuit board. I measured each component and the worst case variation from one speaker to the other was 1.2% and the inductors matched within 0.4%. So, after I had measured everything I put the speakers back together and enjoyed listening to all my favorite CD's. Thank you Bowers and Wilkins!