10A power suply, high frequency
For the frequency and power you are looking for, a off the shelf audio power amplifier should do it nicely.  It would be best if you can use parallel/serial combinations of this wire to get around 8 &Omega; impedance, since that is what the audio amp will be able to drive well.  Too low a impedance, and the amp will not work well, be inefficient, and possibly even shut down.  To high impedance won't hurt anything, but it will be hard to push significant power into it.