Summitav - I think you may have explained how to do it, but I'm a novice and don't quite understand. Currently the Tandberg amp running 2 Dq10s is more than sufficient, as is the Tandberg amp running the 2 subwoofers. Do I need a 3rd amp to run the second set of DQ10's? Thanks for all help from everyone.
It would probably work "best" if you used an amp channel for each DQ-10 and sub.
DQ10s are probably less than 90db efficient so they like LOADS of power. As well of you ran them on one amp in parallel then that would be a large 4 ohm load.
To use another amp for the second pair simply use a Y-connector (or sometimes called a Y-splitter or cable) to split the output to run to each amp.