What is Impedence?
1.
A measurement (in Ohms) of how much an electrical circuit pushes back when it's pushed.
The
phone /phono jack input to anamp is usually a high-impedencecircuit . It will not allow a high amount of current to flow into the amp.Woofers on the other hand are low-impedencedevices which allow a large current flow from the amp to provide a massive amount of power to the people...unless you push too much andsmoke em.
See