I compared my S60 crossover to the schematic in a service manual and find a difference. In the manual it shows an additional RC across the woofer of 37uf and 3.3 ohm and a 47 ohm resistor across the inductor in series with the woofer. This must have been a production change after mine was made. My serial number is: 745070. Does anyone know the net effect of or reason for this change?

Yes, the woofer type was changed in production.
You have the late version.

Martin

Thanks. Was the original woofer an SEAS also? Curious as to what parameters were different for such modest crossover changes.

The earlier woofer was a VIFA M25WN-40
Later a SEAS 25 F-EW was mounted, requiring changes to 4 components in the filter;
One capacitor (C2) and two resistors (R2 and R3) was removed and the ferrite core
of the coil L1 was changed to give the coil more inductance.

Martin