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In the Forum: Horn-Loaded Speakers
In the Thread: Macondo’s Midbass Project – the grown up time.

Post Subject: Condensation is the problemPosted by miab on: 9/21/2010

Actually the thermal efficiency or inefficiency is not the problem. It is the condensation that occurs when a cold plane meets a warm one. Warm air vapour WILL condense on the colder plane of the attic. what is in between is your wooden horn structure and drivers. You've insulated the back chambers very well but forward of the driver mounting it will be cold on the outside of horn. The paper cone and coil is what I would worry about. The horn should survive because of the plywood and drying factor. Expect weeping horns though. Your cathedral ceilling makes the problem worse because because of the warm air rising. Get on a ladder now that your hole is plugged and stick your head up there and you will feel the warmer temperature.

The best and proper solution is to do what I proposed before. Contain the horns within their own room within the attic and heat and cool the that room as you would any other room in the house. With a return air also. The cheap easy semi-solution is to stuff as much insulation around the horns as possible and paint the inside of the horns and triangle wall of the horns with a shellac based paint to act as a vapour barrier. After going through all this trouble/expense and the project looking to be a beautiful and permanent fixture in your life it would be a shame to dismiss this as a "I think I will live my first winder with this house to see what need to be done and how the horn will impact anything thermal."

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