Aug 11, 2014 12:42PM PDT
Thank you for your post. We have had a few customers ask this same question and it has sparked us to looking into the idea on future G-Project speakers. Unfortunately the current Bluetooth technology of our speakers only allows one speaker to receive streaming at a time, sorry.
One option you could try would be to use a headphone splitter and use a line in cable to the G-BOOM and the G-GRIP... which isn't as convenient as wireless, but it would 'double' your sound