Professional house audio systems are usually connected one of two ways.
1. A distribution amplifier provides a seperate amp channel for each speaker. A volume control in each room adjusts the level of 1 pair of speakers.
2. 2 amp channels with sufficient power are connected to impedence matching volume controls in each room. This insures that the receiver/amp sees an 8 ohm load with multiple (2, 4, or 8) pairs of speakers connected. The power is "divided" among the rooms so a 100 Watt/channel stereo amp could deliver 25 watts to 4 pairs of speakers.
3. This non-standard option might work if you are only using 2 or 3 pairs of speakers (4 or 6 total). Get a multichannel HT receiver. Set it in 7 channel stereo mode. Connect 1 speaker to each amp channel. Add volume standard volume controls if necessary.
