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The FLAT setting is used for full-range or mixed stereo/mono applications. FIGURE 2—AMPLIFIER CONTROLS 4. BASS EQ -(model 500 only) these switches activate an 8 dB bass boost circuit. Use as necessary for low frequency enhancement. 5. CROSSOVER FREQUENCY - controls the frequency range of the amplifier. Each half of the amplifier can be set independently for optimum performance. 6. LED INDICATOR - the green Power LED lights to indicate normal operation. The green LED will shut off to indicate amp