I have three sets of computer speakers that have no adapters. I'm trying to determine what kind of adapter I can use as I'm sure I have some old ones that would work. The problem is that I cannot determine the polarity of the little power jacks on the back of the speakers. There's no information on this anywhere.
I'm still confused about what adapter to use. Two speakers indicate that they're 9V, but that's all the information there is.
One speaker is 12V 0.5A and there's a symbol that indicates rectified AC (one long dash over three short dashes). However it also indicates to use an adapter that is 230V. So, if I use 120V adapters (for the U.S.) would that be ok?
When choosing an adapter, do watts matter? And what about mA and unregulated adapters?
Here are some of the adapters I have (I'm not going to include the polarity): Input:120v AC 60 Hz 10.1w Output: 9V DC 600 mA Input:120v AC 60 Hz 12w Output: 9.0V DC 500 mA Input:120v AC 60 Hz Output: 9.0V DC 1200 mA Input:120v AC 60 Hz 14w Output: 12V DC 500 mA Input:120v AC 60 Hz 9.5w Output: 12V DC 500 mA