I use 4 of the SPF 12 speakers in parallel. This will give you an 8 ohm load. You can connect up to 8 in parallel and stay below 4 ohms total. However, understand that these are small speakers and are not very loud-- but big enough to announce in moderate sized room. If you have a large room, or want to put your speakers in a hall for multiple rooms, the Elk 8 ohm speaker is much louder.