The la-40 has the option to convert +4dbm to -20dbm or -10dbv, -20dbm to -10dbv or +4dbm, and -10dbv to -20dbm or +4dbm, using three potentional inputs/outputs (xlr,1/4in,rca). Newer models have switches on each in/out that can adjust from +4dbm to -20dbm, but there aren’t any switches on the...