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You really should get the NTRAK steam annual The key to decent sound is not where you place the speaker (firing up or down), but putting the speaker in its own sealed enclosure. If you want the best sound, DO NOT RELY ON THE TENDER SHELL AS A SPEAKER BAFFLE. Period. And if you buy the 2016 NTRAK Steam annual, I'll tell you how to do all this, including building a speaker enclosure, in detail with pictures!John C.PS - here's a teaser photo of a speaker mounted in a Bachmann 2-8-0 tender shell:
...... While it is true that a speaker in its own airtight enclosure will be audible without any holes drilled in the shell, to me it is not all about the sound volume. My opinion is that the sound quality (not just volume) is better, especially the higher frequencies when the speaker is directly exposed to the ambient air (holes in the enclosure). But this is my subjective opinion. ......