Sadly, no. I think I have some cables that came with them, but as you know the LK280s need modifying to disengage the internal transformer/power supply. I think you also need a 5 pin din type connector fitted to the back of the LK280 and a hole blanked off. I reckon I could 'cook something up' to get the Sparks connected but it wouldn't be very elegant... I do however favour the 'belt and braces' approach.
The reason I've never earnestly tried to use them is because I figured that each channel of my LK280 only drives a single speaker driver with no crossover in the way either... So this being a very easy load the internal power supply of the LK280 should easily be 'man enough' to supply the current required (I've over-specced the caps too)...hence no need for a beefier power supply...but I could be wrong, I usually am.
Mind you the pair : an LK280 sitting on top of a Spark looks really cool...rather ominous, a military look, something the marines from Aliens might use...