Search up Google and enter your amp (name and model #) , and it should show you a pdf manual of that amplifier and show you that , possibly a 3-channel set-up would fit your needs, 4 ohms is usually the lowest minimum for the middle mono channel. Then, you could run the other two L & R channels for your mids and tweets (in stereo) on the remaining two channels; thereby in keeping a single amp to run the entire system. Also, 2 ohms would usually be the normal minimum on same amp for stereo amp output abilities, so that could easily run 5 speakers off one amp. I did it for years on a RF-600a4 with one 12" sub, and two 6 1/2" midbass, and two tweets (usually Morels, or Image Dynamics). Hope that helps...
Answers & Comments
Search up Google and enter your amp (name and model #) , and it should show you a pdf manual of that amplifier and show you that , possibly a 3-channel set-up would fit your needs, 4 ohms is usually the lowest minimum for the middle mono channel. Then, you could run the other two L & R channels for your mids and tweets (in stereo) on the remaining two channels; thereby in keeping a single amp to run the entire system. Also, 2 ohms would usually be the normal minimum on same amp for stereo amp output abilities, so that could easily run 5 speakers off one amp. I did it for years on a RF-600a4 with one 12" sub, and two 6 1/2" midbass, and two tweets (usually Morels, or Image Dynamics). Hope that helps...