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Use a Pad!L-pad, or simply a "pad" for short, is a simple circuit to accomplish the necessary matching. The pad is typically based on a configuration of resistors to create the necessary amount of attenuation. Pads can be designed to match or ignore impedance.L-pad, or simply a "pad" for short, is a simple circuit to accomplish the necessary matching. The pad is typically based on a configuration of resistors to create the necessary amount of attenuation. Pads can be designed to match or ignore impedance. The L-Pad is a type of pad design. A balanced T-pad (known as an H pad) has resistors in series with both sides of the input, and both sides of the output, but with a common resistor (R2) bridging the midpoints Radioshack offers an inline pad for an unbalanced, -10dBV source to go into a microphone input. The Radioshack part number is 274-300, the 40dB, RCA-to-1/8" mini-phone, in-line pad. You can create your own pad using resistors. Here is one example: [[File:audiolevelmatchingpad.png]] A simple 2 resistor model can be used. Attenuation in dB = 20 * log10((R1 + R2) / R2) [[File:audiolevelmatchingpad2.png]]The L-pad is the classic voltage divider circuit using two resistors to reduce the input voltage by some amount.