Received a new Aspire after returning the old one. Works GREAT! Just a couple of things. 1. I have noted that when the lipo begins to lose mAh during flight the sound from the Aspire starts to cut in and out. Installing a fresh lipo solves the problem. Apparently, the Aspire requires a LOT OF JUICE to function properly. 2. I have purchased several tt25 transducers but they were expensive. After dong a lot of internet searching I found transducers, the same size, look, weight and feel of the ones that came with my Aspire. I purchased a couple and there is no difference in sound quality and the weight is the same. At less than half the price too!!!!! Dayton Audio DAEX25VT-4 Vented 25mm Exciter 20W 4 Ohm. Price is $8.50 The web site is http://www.parts-express.com/dayton-...4-ohm--295-222.