skip wrote: Hadn't planned to, didn't know they would degrade over time. Think I should while I'm in there? What would be a good brand to use? How about the induction coils? Those might be rather hard to find I imagine.
You should absolutely upgrade the resistors. It is not a matter of degradation, it's a matter of the crappy stock high watt inductive resistors. Upgrading them will result in a very noticeable improvement.
The schematic I have for the standard Plat's shows the following, per speaker:
(4) 18 ohm 25 watt
(1) 7 ohm 7 watt
(2) 36 ohm 10 watt
As I'm sure you know, there are many revisions, so check your crossovers before ordering anything.
Anyway, for the 18 ohm, 25 watt resistors you will need to replace them with Mills non-inductive 18 ohm, 50 watt resistors available here, http://www.partsconnexion.com/resistors_mills_mrc.html
For the 7 watt and 10 watt resistors, replace them with Mills non-inductive 12 watt resistors available here, http://www.partsconnexion.com/resistors ... mra12.html
For the 7 ohm, use the 6.8 ohm, 12 watt as it's close enough.
For the 36 ohm, use two 18 ohm, 12 watt in series.
The inductors you would most likely have to have custom made. Northcreek would be able to handle that. I don't remember if the stock coils are metal (iron, steel laminate, ferrite) core or air core. There are advantages and disavantages to both types. One advantage with air cores is they don't saturate, one disadvanatge is they have a higher impedance. One advantage with metal cores is a lower resistance resulting in improved bass response, but they will saturate easier and will lower the over all impedance of the speaker, which very well could be a problem for your amp(s).
I'm going to suggest that you leave the inductors alone, at least for now.