Example Specification: 4 channel amp
4 x 60W / 2 x 60W + 1 x 160W at 4 ohms
Power Levels [2 Ohms]
1 x 80w

Power Levels [4 Ohms]
1 x 60w

Bridge
2 x 150W

Does this mean?:
Use 4 channel: each channel 60W output at 4 ohm each
Use 2 channel: 1 60W (4ohm) and 1 160W (4ohm)

what the meaning of power level for 2 ohm = 1x60w? and bridge?

Any input highly appreciate

2ohm means you run with 2ohm speakers then you get 80W to use from the amp
4ohm means if you run with 4ohm speakers then you get 60W to use from the amp.

Bridge means combine 2 chnls together to increase available power. For your case, if you combine chnl 3&4 together you get 160W for 1 chnl.

thanks for the explanation.

Btw usually how the setup for bridged? need to use what cable? or issit just simply channel 3 connect to channel 4 input (RCA) and the output become bridged?

Use normal speaker cable only. Nothing to do with the RCA.

Assuming you are using a 4 chnl amp.

There should be 4 input RCA.

Normally only subwoofers use bridged connections. If you use component speakers with bridging, it wont sound good.

Bridging is by wiring the +- from 1 speaker to 2 different chnls . Example like: from speaker , the + wire go to chnl 3 +, the negative wire goes to chnl 4 - .