Velodyne had an amp, (was it the 1250?) that had speaker level XLR outputs. I've only heard about it from another forum member, Penngray.
If it is a speaker level output, you can get male/female XLR connectors at Radio shack or a million different places online. They're just a couple bucks. Instead of using shielded coax cable like you'd normally use with them when making custom length cables, solder on some 12ga speaker wire and you're done.
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