i was using Sennheiser Digital 1000 wireless units(until they got stolen) I'm now using a Sennheiser Freeport. Both are fantastic for bass. Even though the specs on the Freeport would suggest that it would not work well with a 5 string bass, it does work well with a 5 string. So people that would dismiss it just by reading the specs need to listen with their ears instead of their eyes 
