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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. 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.