Audio Systems: 70 volt system, watt amp, power amplifier

Question
Hi, I have installed 70v ceiling speakers before but I have never installed this many (65)I know enough to add up the wattage tap of each speaker then add them up and make sure that the power amplifier has enough power to power the total wattage of all the speakers.30 speakers will be in the main halls 15' high the rest will be in the offices 8' high ceilings. Can I set the office speakers at a lower wattage tap then the halls? Or do they all have to be set the same. I would do this to achieve a slightly higher volume from the hall speakers since those ceilings are higher. I'm using a QSC CMX300V Amp in bridged mode I get 600 watts@70v. I will be using a simple mixer all that's going through the speakers is backround music. Is there any component I'm missing? Thanks for the help

Answer
The real question you need to address is the impedance in ohms. This will make a huge difference in whether or not you're going to hear anything or blow the amp up. This will be a variable number affected by how the speakers are wired - series, parallel, and/or a combination of the two.

Ass far as the wattage - you mainly don't want the speakers to be less than the amp puts out. A 4 watt amp @ 8 ohms will drive an 8 ohm 300 watt rated speaker just fine, but the reverse is not true. The mixer (if it's feeding the amplifier) doesn't matter as far as the amp to speaker relationship is concerned.

I would contact a professional in your area for further information about this