If no one is able to answer your question here, you might try audiokarma.org. I know that there are some serious modders there that have played with the crossover components (where the APOC diodes reside) on the 801's of various series.
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Brad - in addition to what Elee said - you can download the service/parts manual at
Select the matrix 800 series and download the service manual for the 801s2. the last few pages discuss connections and values. It may helpful to you.