QQQ: thanks. I really am glad you included that :)

The standard approach in the A/V (that means audio/VISUAL) world is to take a power amp output and put 330 ohms in series with each channel of each headphone. I did this for a customer with a powerful Lexicon power amp, and it works like a charm. Take the signal from the TV's speaker output if it has one, or use a small power amp as suggested above.

The resistor limits the current to the headphone, keeping it from blowing; the headphones will still deliver good volume unless they are actually 8 ohms or so 9most are higher in impedance). Also, you can use different models of headphones with this approach because the resistors tend to equalize how the power is split up. You really only need to worry about how the power is sucked if it is NOT in the air.