The centre speaker has a weak spot, the magnet falls off it and that kills it. There is a newer model which has bolt going through it to secure the magnet.
Door speakers can be as simple as a disconnected wire, if the door card has been taken off for window adjustment or such. Otherwise it may be a faulty wire, from door operation.
The SC901 can operate in three different ways, normal stereo with front and rear, 3ch stereo with front, rear and centre, and Pro Logic with all speakers active and focus on front + centre, with rears as echo speakers, the effect can be adjusted and faded as you wish.
This three effects can be used in cassette, CD and radio mode.
The SC900 was an older version with less functions.
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