Car speakers don't work

installed all new door panel speakers today. When I did one
I would reconnect the battery and turn on my music. All 3
of of 4 speakers were doing good. Once I installed the 4th
and last door panel speaker and tested none of them
worked. I even unconnected that 4th speaker and tested it
and they all still didn't work. I have a new touch screen head
unit. I checked the fuse on the unit. It's good. I checked the
ignition power fuse for the hesd init also. That's good. I test
tested the 4th speakers wires when the car was on with my
multimeter and I didn't get any voltage but got about
124ohms of resistance. What's the problem? Why is there
no more sound?