In SX Microcontrollers, SX/B Compiler and SX-Key Tool, dpaton wrote:

Andrew-

If I understand you correctly, the box you've got does NOT contain potentiometers, but instead uses L-pads. If you can provide more information (model #s, pictures, anything at all) about them I can be more sure, but I suspect you'll kill any digipot you wire into it. The boxen like the one you've described usually use transformers to match impedence on nlong speaker cables and isolated L-pads to control voltage without changing the load on the amplifier. In the course of doing all this however, the L-pads have to be able to dissipate a portion of the load current, and are generally rated at a minimum of 5W. Digipots are meant for the little line level signals, and usually have wiper resistences of 50 ohms or higher, and power ratings measured in microwatts.

-dave

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