The installation manual is available on the Web (google for IMA3303ins.pdf
- the name of file most use). I think you should download one, it may be
useful in many ways, not only for the issue at hand. It basically says all
three should be connected to the same screw terminal marked "DOOR SPKR". I
would think polarity does not matter since the speakers are supposed to be
on the different ends of the house - front, back and side:
Connecting the Door
1. The door speaker connects to the Master
terminal board with two conductor (IW-2)
22 gauge twisted pair wire.
2. Refer to Figure 4. Connect the two wires
from the door speaker(s) to the two terminal
screws marked DOOR SPKR on the Master
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