Speaker Installation question

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After trying various positions for the speaker, I decided the best place for it is up under the Dynamic brake fans. Will glue a couple of matchstick spacers across the shell to mount it to and tacky glue the speaker to them. The Tsunami decoder has a couple of chips (The little black rectangles in the middle, I think that's what they are on the underside). Do these get hot at all? 'Cause that's what the decoder will be resting on.

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