Mark, yes, that's why I suggested a stereo receiver(his father may have none now)such as the HK3380, which has separate output terminals(and on/off switches)to drive two sets of speakers in parallel. Since a total of four speakers was mentioned, I interpreted this to mean two on each floor.

Adrian, yes, if the 8ohm speakers are connected in parallel the resulting net nominal impedance is 4ohms. Many receivers, including the HKs, would have no problem with this.

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Enjoy the music, not the equipment.