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[QUOTE="Boswell, post: 460633, member: 29034"]
While rummaging in my electronic archives for something else, I came across a photo of the innards of a small 12dB two-channel attenuator box I built in a hurry some years ago. This was for reducing the +32dBu output of my API3124+ pre-amps to +20dBu when I needed to feed the balanced ADC insert returns on my Audient ASP880 for recording purposes. The box also has switchable 0dB/12dB attenuation outputs for routing to a mixer for live use. 
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The inputs are on the left, the switchable outputs top and bottom, and the fixed -12dB outputs on the right. The switches are adjacent to their respective jacks. The series attenuation resistors are just visible  mounted on the switch contacts, and the shunt resistors are across the signal terminals of the output jacks.

I see I chose standard metal film 1/4W resistors for the attenuator components, but they were probably what I had to hand at the time. In operation, the box deals well with +32dBu inputs.
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