A “zone” is typically defined by 2 speakers (or a single dual voice coil speaker which acts as 2 speakers). Each AB-134 keypad can handle one pair of speakers (or one dual voice coil speaker). If necessary you can attach 2 pairs of speakers, the volume may suffer a little bit however since you are splitting the amplification between 4 speakers instead of 2. If you are planning on having 9 zones, each with a single speaker, you would want to use a dual voice coil speaker in each zone to add stereo sound, a regular speaker can only play left, or right, a dual voice coil can do both. If this is the case you would want to take a look at our ID653 6.5” 2 way single point in ceiling loudspeaker. On that 8th zone you could then use 2 standard speakers such as the IC615 ARIA In-Ceiling speaker. All Channel Vision audio systems, the AB-902 included are intended for use with 8 Ohm speakers. The AB-134 is a unique type of amplifier, unlike a traditional amp it does not have a “wattage” rating, since it is powering each of the speakers IN the zone instead of all zones wiring back to a centralized amp. Because of this it creates louder more clear audio while using less power. With the AB-902 you can add another AB-404 and “link” them together. Then purchase additional AB-134 Amplified keypads to add additional zones at your discretion. If you wanted to do 8 zones with 9 speakers I would recommend the AB-902 Audio Kit, an additional AB-404, four additional AB-134W amplified keypads, 7 ID653 6.5” dual voice coil speakers, and one pair of IC615 Aria in-celing speakers for the 8th zone. If you have any further questions please contact Channel Vision Sales or Technical support directly.