A:Answer Thank you for your enquiry.
The Xtreme 2 has JBL Connect PLUS Technology, an IPX7 rating (waterproof), and is slightly bigger and heavier - while the Xtreme has JBL Connect, IPX 5 rating (splashproof), but is slightly lighter. Both have the same output (2x20W), but the Xtreme 2 has a bigger frequency response.
If you need further assistance, please submit a case request at https://www.harmanaudio.com/support-contact.html and the Customer Service Team will be more than happy to assist you.