Re: 10 ohm Speakers plus 2 ohm Speakers?
First, the original amp won't work well with a 2 ohm speaker, especially if it is in parallel with a 10 ohm speaker. The circuit resistance will be 1.67 ohms, and the 2 ohm speaker will sound much louder than the 10 ohm speaker. Old amps won't drive that kind of load.
If you run them in series the 10 ohm speakers will be much louder than the 2 ohm speakers.
"For those that will fight for it...FREEDOM ...has a flavor the protected shall never know."
Semper Fi! L/Cpl Edwin L. "Tim" Craft, B Co 3rd AT's, Khe Sanh Combat Base, February, 1968