Well generally for the channel music system speaker connection can be done in two methods .....
1. Impedance matching method.
2. Using LMT's (Line Matching Transformers)
The first method needs a lot of care in calculation and more complex. (No. of speakers + Nominal Impedance of the speakers + Output impedance range of the amplifier + Output wattage of the amplifier + Wiring pattern) Most of the times you have to use a Parallel+Serial combo connection method to get the correct impedance matching between the amplifier and the speakers. If this is not done properly there are possibilities of amplifier getting damaged.
The second method is more professional & safe for channel music application. In this method the speakers are driven using the LMT of 100 volts OR 70 volts depending on the amplifier you choose. And by this method you can connect ANY number of speakers depending on the driving amplifier's output wattage and the wiring of the speakers has to be in PARALLEL only.
Personally, for all my installations in Bangalore, I use AUSTRALIAN MONITOR amplifier and SONODYNE speakers fitted with LMT. The Australian Monitor is sold & serviced by Sonodyne. So you can get both under one roof.
For your setup of six speakers, you need the model AMC 60. It's a 60 watts mono amplifier with a 100 Volts line output. It is not recommended to utilize the maximum wattage of any amplifier. So with AMC 60 you should plan upto 50 or 55 watts max. With a 5 watts tapping in the LMT, you can connect upto 10 or 11 speakers max and believe me the sound produced by 5 watts tapping is more than enough to fill a large area.
Also there are volume control unit available separately to use with these speakers to control independent volume level of each speaker. Pricing is very decent when compared to other products and also the sound quality as well.
Check out with a Sonodyne dealer in your city for more details. They also do a free installation for you without any extra charges and their service backup is really good. All the best .....
Cheers,
Ramesh @ Bangalore