two speakers on one terminal

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wireguru said:
(unless this is 70v line) you could blow up their amplifier. Connect two speakers in parallel like this and you cut the impedance in half. Look at the back of the amplifier for minimum impedance, then check the impedance on the speakers. If the amp says 8ohm min, and you connect two 8ohm speakers to the amp, the amp will either shut down on overload or blow up with any significant volume level. If the amp says 4ohm minimum and you connect two 8ohm speakers in parallel you will be ok.
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Most of the constant voltage systems I see these days are 25 volt systems. Cheaper to install and safer for the end user to mess with. My experiences have been in school environments and you don't want 70 volt wires poking out of the wall boxes with the speaker missing.
 
ozark01 said:
Most of the constant voltage systems I see these days are 25 volt systems. Cheaper to install and safer for the end user to mess with. My experiences have been in school environments and you don't want 70 volt wires poking out of the wall boxes with the speaker missing.
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Talkback systems are 25 volt. Most distributed sound systems are 70 volt.
 
Most of the systems I dealt with were talk-back systems with the speakers being stolen for home and car use. I'm sure the thieves were disappointed once they heard the quality of the speaker.

The 70 volt system does allow for more speakers and longer runs to be used so it is a better solution for larger applications.
 
Well I will put my 2-cents in. Most of this has been said except for one thing.

An amplifier will be rated at a specified power into a specified impedance. For example let's say 100 watts into 2 ohms. Provided you do not go below 2 ohms impedance you are OK. What you sacrifice is by going above 2 ohms is power. For example if you install 4 ohm speakers the power drops to 50 watts, 25 watts @ 8 ohms, and 12.5 watts @ 16 ohms.

Get you an old Tube amp like a McIntosh and it does not matter as you have a matching transformer. :cool:
 
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