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The rep coils (between the XLR panel mounts and the phonos) are from RS - part number 210-6419 and are mounted on double-sided pads. The coil has a high i/p impedance (typ. 10k) and so doesn't load the balanced signal but it ensures that the Avid (or whatever) is also available as an unbalanced feed - very neat when fitted in a Kelsey wallbox.