I've had no issues what-so-ever using a 2.5mm (male) to 3.5mm (female) adaptor on my GH2. It should not be necessary though as the whole idea of going for a 2.5mm is based on getting us to buy into the Panasonic external mike over other better designs. But I use an external recorder (SD702) for proper sound anyway as the Audio part of GH2 is not comparable to the video quality it produces.