This is right from the owners manual for San Devices.
Pluggable Resistor Networks:
There are 8 pluggable resistor networks on the E682 located just above the upper row of pixel string connectors. Each
resistor network affects the 2 string connectors immediately beneath it. These resistor networks may be changed to a
different value in certain situations, depending on pixel type, and/or type and length of pixel wiring. These networks may
also need to be changed for outputs that are driving DMX devices. The resistor networks must be in place for the E682 to
operate. The standard “as-shipped” value for these resistors is 270 ohms (part number containing “271”. Smaller resistor
values may be needed in cases where the distance between the E682 and the start of the pixel strings is unusually long.
These are the exact ones Iam using and they do work. Sorry goofed again should be 33ohm the part number 0n the resister network said 330.