Have a look at the manual available from that link...its near the end...sorry middle page 13...
Rear panel outputs 1⁄4-inch output – Mono analog output that accepts either 1⁄4 inch TRS balanced or TS unbalanced cables. Can be used to link multiple L1® Compact systems together by connecting the 1⁄4-inch output from one L1® Compact system to the 1⁄4-inch input (Channel 2) on a second L1® Compact system. This will provide additional coverage in larger spaces. You can also use the 1⁄4-inch output to connect to a house PA system and use the L1® Compact system as your personal monitor.
Just to save time, this is the par I am referring to. Its not perfect but it could allow via a x-over an additional amp.
[This message has been edited by miden (edited 05-23-2009).]