I put an 8 ohm speaker in the top rear panel just outside of the shoulder harness gap.
About a 2 1/2 inch hole with a painted screen door patch as the screen.
My hangar mate (avionics wiz) wired a three position switch (headset, off, speaker) with switchable power from the battery for the number 2 radio (Icom A200). Speaker is not wired through the intercom and has no external amp. Works great for ATIS.
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