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Status LEds (on top of amplifier): Power and Protection—Power will illuminate to indicate the amplifier is on and operating normally; protection will illuminate if the amplifier shuts down due to short circuit, DC offset, or overheating detected by onboard protection circuitry 2. HPF, FuLL, BPF Switch—Selects full range, high pass filter, or band-pass filter The HPF setting attenuates low frequencies and is used with mid-range speakers and tweeters The FULL setting does not attenuate any frequen