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(See the Amplifier Recommendations section.) Power-Handling Capabilities The Xi-2181 systems are rated as per the “ANSI/EIA RS-426-A Loudspeaker Power- Rating, Full-Range Test,” which uses a shaped-random-noise signal to simulate typical music to test the mechanical and thermal capabilities of the loudspeakers. A digital crossover was used to provide the appropriate filtering and equalization. The test parameters are as follows: Low-Frequency Section (Pins 1 and 2 par alleled): PE(MAX): 1,200 wa