I have the same problem. It's a great product (very nice holder for the phone, very clean, etc.--a vast improvement over the "official" car kit from THB).


However there seems to be a design problem. Seidio informs me:

"For G2500, the external microphone goes into the jack above the volume control. the ear piece goes into the jack at the top marked SPK"

However, the only way to hear the speaker is by turning up the volume, which creates feedback from the microphone (the echo). So you have to turn down the speaker completely to eliminate it. Catch-22. Also, there does not seem to be a way to switch between speakerphone mode and headset mode. There should be an external speaker jack as on other car kits, so you can place the speaker in a remote location (under the dash). That would eliminate the feedback. There should also be a jack for an external microphone, and a separate one for the headset, and the switch should select between headset mode and speakerphone mode.

I hope Seidio is reading this...