Check your Threshold setting when the CTX speaker is in use. The CTX remembers settings for each method of audio: CTX speaker, CTX/headphones, wireless speaker, & wireless/headphones.
(These settings are in the Universal settings if you check it in XChange2.) If you haven't, you can also set them directly in the CTX. Of course you need to make the setting for each of the four audio methods one at a time, and set all four methods for your liking. For instance: Set the Threshold Level with only the CTX speaker audio. Then plug in the headphones to the CTX and set the Threshold Level that suits you for that audio method. Then do the same with the wireless and then wireless/headphones. Hope that may help..........HH