<font color='#000000'>Again, I'm not a fan of connecting more speakers to an amplifier. You may just end up with more sound, not better sound.
IF you want to hook the speakers up in series (I am NOT endorsing or recommending this) you would connect the red (positive) of the left channel of the amp to the red (positive) connection on the first speaker. Then go from the black ("negative"
connector of that speaker to the RED (positive) connector of the next speaker. Finally, take the black ("negative"
connector of that speaker back to the black ("negative"
connector of the amplifier.
Repeat for right channel. So....
Amp Left Channel (+) to Speaker 1 (+), Speaker 1 (-) to Speaker 2 (+), Speaker 2 (-) to Amp Left Channel (-)
As you'll see, the speakers are run in "series" with the amp channel, one to the next in a chain.
Again, you may want to play with hooking up one set of speakers and giving them a listen at higher volume. Chances are you will have better results.</font>