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[jeffhtg (Jeff Kenney)]

Interesting readings in Waynes Pi speaker debut... I'm wondering what the community has to say about thermal failures.. And what good is Wayne's cooling modification going to do to a lab that is stacked up side by side with a bunch more - effectively blocking any airflow between boxes?

oops (puts on dunce cap) didnt see the existing thread.

[Wayne Parham]

Keep a gap between horns.  If stacking them, use a pair of 2x4's as risers between them.

• Heat Reduction
• 12Pi basshorn - just about ready for prime time

Naturally, all speakers have a thermal limit.  By removing the heat, you can raise the limit.

Excursion limits are reached first at very low frequencies, but thermal limits are reached at higher frequencies.  Above 50Hz, the LAB12 speaker reaches the point of thermal failure before it reaches mechanical limits.  At 40Hz, the thermal and mechanical limits are reached at about the same time.  This is true even in free air, where the mechanical suspension is the only thing limiting cone motion.

A loudspeaker system that reduces excursion will obviously help it with mechanical limits, particularly if excursion is reduced at low frequencies.  But regardless of this fact, above 40Hz, excursion isn't an issue as much as heat is.  So if the sound crew is careful to limit LF energies with a high-pass subsonic filter, the thermal limit is probably the one to be concerned with.