How to arrange resistors for certain resistance
I'd use a transformer like this: -







simulate this circuit &ndash; Schematic created using CircuitLab

The transformer turns ratio would convert the 3 ohms of the inter-wired 6x 2 ohms speakers to 1.5 ohm seen on the primary. This, being in series with 2x parallel 1ohm speakers makes a total impedance of 2 ohms seen by the voltage source.

The turns ratio is 1:\$\sqrt2\$ by the way