speakers
I am fairly new to and interested in electronic engineering. I want to control a speaker I found in an Xbox 360 headset with my Arduino, but I dont know how. Other small speakers I own all have 2 pins, + and -. But this speaker has 4 pins which are all interconnected. Image of the speaker:
Can someone tell me how this speaker works, or put me on the right track?
As it says in the PDf as well:
With power tabs for 3W and 6W.
And:
"Black:Com Red:1.7KΩ White:3.3KΩ"
Or drawn, its equivalent resistances are:
simulate this circuit – Schematic created using CircuitLab
You connect Black & Red for 6W at 100V, Black & White for 3W at 100V. Do NOT use the other wire in either case.
Yes, it is allowed to have that variable a load on your amplifiers, given certain precautions. Most amplifiers can tolerate open circuit on their outputs, and, subject to limiting the output so they don't get too hot, somewhat lower than their 'rated' load.
A common method for supplying multiple speakers from a central location is the '100v line' method. Each speaker has a transformer before it to raise its impedance. This can get expensive in transformers, that have to be rated for the audio range.
You should be able to buy high impedance speakers, 32 ohm is not uncommon. Ten of those in parallel would present around 3ohms to your amplifier, which most audio amps should be able to drive at less than max output with little distress. How much fi and power do you want, I suspect these higher impedance speakers will be lo-fi and low power.
You could precede each speaker by its own local amplifier, which would raise the per room loading to a level where it ceases to be an issue. If powering the amplifiers via the CAT5, you would want a beefy electrolytic across the supply at the amplifier.
Best Answer
It looks like the left hand pair are connected together and ditto the right hand pair: -
I've shown red lines where I believe copper exists joining pairs of connections. You should use a meter to confirm this or, with an amplifier output fed via 100 ohms to protect it from shorting, experiment with which connection produces sound from the speaker.