ShockWave

(This concept has been evolving in my head for quite a long time...)
Ever since I found out about railguns, I've been pondering modifications.
[Madcat]s Laser Railgun (linky 1) is a neat idea.
So my crazy brain started smashing things together. If we want to fire a pulse (or stream) of plasma, we need to create conditions that plasma likes. I remembered (from my distant past) seeing a graph of the breakdown voltage (linky 2) & how it has a minimum at a low pressure.
So I thought, could a soundwave be used to prouce that lower pressure, but intermittently? But speakers lose pressure quickly with distance (1/r² I think).
Then I found out about directional speakers (linky 3).
So that gives me a highly directional stream of low-pressure air pockets, with the added convenience of high pressure pulses to push things along.
But plasma, being hot, wants to cool down & dissipate. So fire a high-powered laser into the plasma, to keep it happy.
So, we have a directional speaker, with a taser to create plasma discharge a small distance in front (to be in a more "stable" wave, rather than close to the speaker where the waves are interfering), & a laser aimed through the centre of the speaker to (hopefully) be asborbed by the plasma to keep it hot.
I have no idea about what frequency would work best (most LRADs use ultrasonic freq's), whether it would be badly affected by wind (probably...), what type & frequency of laser to use; but if it works... shocking!