Definitely add ventilation. Even though they're 90% efficient, they still generate heat even when idle. Under load, even more heat, and without openings, it will only build up inside, especially with a wooden enclosure.
You could simply drill a set of holes in a nice pattern in the lid over each amplifier, with some complimentary holes underneath to create a natural convective flow.
You could simply drill a set of holes in a nice pattern in the lid over each amplifier, with some complimentary holes underneath to create a natural convective flow.
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