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Audio ConnectionsView larger How An Equalizer Is Used The Planet Audio PEQ10 parametric equalizer is a high-fidelity signal processor/preamplifier that allows you to control the relative levels within the audible frequency spectrum of a stereophonic system. It is intended for use in a car audio system which includes amplifiers in a signal path after the equalizer, and provides front, rear, and subwoofer low level outputs via RCA connectors. Specifications EQ center frequencies: 75Hz – 200Hz – 2kHz – 20kHzEqualization range: +/- 18 dB (boost/cut)Frequency response: 20Hz – 20kHzSubwoofer crossover frequency: Variable 45 – 180HzSignal to noise ratio: 105 dBTHD: 0.05%Subwoofer channel THD: 0.05%Channel separation: 60 dBLow Level Input Voltage: 0.5 VDefeat/Equalizer: 0 dB/ +/-1 dBPower supply: 10-16V negative groundOutput voltage: 7V RMS Front Panel Controls And Key FeaturesView larger Front Panel Controls And Key Features Master Volume Control: Use this to adjust the overall output volume level. Fader: Use this control to balance the sound level between front and rear speakers as desired. Auxiliary Input Selector: This button permits you to select the equalizer input source. The unit features separate rear RCA inputs for CD/DVD players and your choice of an AUX input. Subwoofer Frequency: Use this knob to set the crossover frequency for the subwoofer output channel (i.e. it is a low pass filter) Subwoofer Gain: This control permits you to increase or decrease the output level of the subwoofer channels. Boost/Cut Controls: Each of these controls represent a range of frequencies surrounding a center frequency to cover the audio spectrum from subwoofer frequencies to treble frequencies. Adjust these controls to suit your taste and listening environment. Each center frequency can be adjusted +/- 12 dB.