Can I conect it to a car amplifier and to my house out put?

Just curious, but how do you plan to get a 120 Vac 60Hz power source in your car? Are you planning on using a power inverter? Can that inverter supply the Input amperage required?

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Betting he want to use the amp in the House on 120 volts.
If so, you can as long as it doesn't draw more than the 2.9 Amps. May want to use a Larger Power Supply.
What are the specs on the stereo amd amp?

http://www.circuitspecialists.com/12-volt-power-supply