The cooling fan in the Barbetta Sona 32C is a 120-mm computer fan that is very quiet and suspended on bungee cord so there is no vibration to the case and other components. The earlier 32s didn't have a cooling fan and sometimes overheated and cut out at higher volumes. A couple vents and an inexpensive fan from Dollar Store solved the problem.

Gary
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PSR-S950, TC Helicon Harmony-M, Digitech VR, Samson Q7, Sennheiser E855, Custom Console, and lots of other silly stuff!

K+E=W (Knowledge Plus Experience = Wisdom.)