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A simple and effective passive Switching-Box is assembled quickly with the high quality Elma type 04 switches that are popular in the professional studio and high-end area since many years. I recommend the following configuration and would like to briefly explain the details . This is a passive switcher / splitter for unbalanced signals such as from RCA / phono plugs. For unbalanced signals, it is optimal to connect the plug sockets (and negative signal) directly to the mass. For ground/mass you should use thicker cables than for the signal lines. Blank copper or silver coated wire has proven itself for the mass/ground connection. On the skizzy the mass (referred as Grnd) "Ground / black" connects the complete row of the left plug ground connectors. Another copper wire connects the complete mass row of the right channels. For signal cables I recommend a cable with shielding, eg Copper - silver cable for high-end applications with shielding screen. The shield is connected to the ground only at the input joint / but not with the switch. Cut the shield-wire approximately 1 cm before the switch to avoid a ground loop. The connection diagram with the 04-1264 Elma switches is shown on the drawing with only 4 inputs but up to 6 inputs are possible with this switch. In a symmetrical structure, you can either use a 4 pole Elma switch with 3 positions or if more positions (switching inputs) are required you may obtain an Elma switch with multiple levels from us. If you have any questions, contact us.

Author: Don