The physical fit is simple. They are designed to stack. How you drive them though is a different matter. Depending on the vintage these are either an 8 Ohm load or a 4 Ohm load to the amp. Each pair needs to be connected to the appropriate driver/controller box for it's impedance. IOW, you need to run two sets of power amps, two controllers, and then two pairs of speakers.

Here is a transfer function view of the same measurement. Example 2: Celestion G12M Greeback. This is what the user manual states for the input specs.

BTW, just adding more speakers to a stereo power amp (or two monos) won't make the system appreciably louder. All you are doing is diluting the power output of the amps between four speakers rather than two.

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More speakers, sure. But each one now receives half the power compared to running 1 pair. Posted on Sep 10, 2014.