You can do it either way but here is my suggestion and the reasoning behind it.
Use one amp on each speaker. One channel drives the highs(and/or mids) and the other drives the lower end. The reason I feel that doing this is better has to do with the power supply only having to supply higher current to one channel of each amp. It allows the amp to work easier. One channel isn't drawing much from the supply(highs) so the other side can use the extra draw. It allows the amp to drive the lower side a little better(generally cleaner).
The one caveat is both channels need to be reasonably close in input sensitivity to allow your speakers to remain balanced in the frequecy spectrum.
You can use "Y" connectors at each amp or simply solder a wire across the hot leads on the inputs of the amp from left channel to right channel.
Y connectors will degrade your incoming signal a touch.
Use one amp on each speaker. One channel drives the highs(and/or mids) and the other drives the lower end. The reason I feel that doing this is better has to do with the power supply only having to supply higher current to one channel of each amp. It allows the amp to work easier. One channel isn't drawing much from the supply(highs) so the other side can use the extra draw. It allows the amp to drive the lower side a little better(generally cleaner).
The one caveat is both channels need to be reasonably close in input sensitivity to allow your speakers to remain balanced in the frequecy spectrum.
You can use "Y" connectors at each amp or simply solder a wire across the hot leads on the inputs of the amp from left channel to right channel.
Y connectors will degrade your incoming signal a touch.