Included with the car equalizer are installation brackets and hardware. We do not accept P.O. Boxes. Item model number CT-7EQ. Frequency Response : 25Hz-50KHz; Output Level: +16dB; Separation: >60dB; Bass Adjust: ±10dB; Mid Adjust : ±10dB; Treble Adjust: ±10dB; Sub Bass : 43Hz & 60Hz.
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