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You can use these outputs to connect Alpine amplifiers or powered subwoofers to build a 4 channel + subwoofer system or an active 2 channel + subwoofer system. Parametric equalizers are multi-band variable equalisers which allow users to control the three primary parameters: amplitude, centre frequency and bandwidth. data-src="https://cdn.media.amplience.net/i/washford/Halfords Car Audio fitting & installation service" The included microphone allows clear phone conversations with the built-in Bluetooth hands-free function. You can even adjust the button and display illumination colour separately in the full RGB spectrum, to match your preference and dashboard.The BASS button next to the central control knob takes you directly to the advanced bass level adjustment function. As you choose one of the six levels, it automatically adjusts frequency cut-off, Q factor and subwoofer level for optimum sound quality and tonal balance. With Variable Illumination, you’re no longer limited to a choice of just a few colours. You can actually browse through a range of more than 150,000 colours to select exactly the tone to match or complement your dashboard illumination. Many preset colours are also available. A 4 x 50W power amplifier is integrated in the product, enabling superior sound and sufficient headroom for dynamic sound reproduction.