The JL Audio JD400/4 JD Series 4 Channel Amp is a high-performance amplifier designed for car audio systems. With a power output of 400w RMS, this class D amplifier delivers clear and powerful sound for your audio needs. The adjustable low and high pass filters, along with the built-in equaliser, allow for customisation and fine-tuning of your sound system. With its sleek silver design and JL Audio brand reputation for quality, this amplifier is a popular choice for car audio enthusiasts looking for a reliable and powerful 4-channel amplifier.