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One thing about the Physics....

You show the smaller cap values physically FURTHER away from the leads that connect to the cables and speaker terminals, inside the box. This plus the length of the leads that connect the box to the cables/speaker terminals, means that the smaller caps are not really able to do much to help control RFI. The sheer length of the leads will create more than enough inductance to effectively 'disconnect' the smaller caps from the circuit.

Due to the total length of the wire leads, and how far the hot and ground are separated, it is likley that even the middle value cap is effectively out of the circuit as far as the speaker cable and speaker terminals are concerned.

Two things folks would want to do to make the most of this kind of circuit:
1. Minimize the overall lead length, and try to keep the hot and ground leads as close together as possible.
2. Place the smaller cap values closest to the speaker cable/speaker terminals, with the larger values physically further away.

These two things will help minimize the overall inductance of the staggered pole RC networks, and maximize the effectiveness of the networks.
Jon Risch

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