FA Series is comprised of 3 professional car audio amplifier models; FA2, FA4, and FA8. Amplifiers offer either 4 or 2 channels of high power high end audio amplification with bridging options to 2 or 1 channels if required. Independent built in super current power transformers combined with high power MOS-FET parallel output stages ensure a clean and pure power. High quality Japanese ruby filter capacitors give ample power reserves and allow for an impressive transient burst potential. The low loss Japanese ELNA acoustic grade coupling capacitors and JRC5532 op-amp section offer minimal signal distortion. High density double sided epoxy circuit boards feature gold plated fiber glass interface and power seats to ensure lossless signal transmission. Each amplifier has built in high pass, low pass, and bypass modes. When powering a subwoofer the low pass filter can be engaged. When powering the mid-bass and treble sections the high pass can be engaged. High pass and low pass filters have dials to adjust the filter frequency so that the optimum frequency range for each system can be dialed in. There is also an independent gain control to adjust for variations in input sensitivity and a 0-6-12dB bass attenuation switch. Each amplifier is wrapped in an elegantly designed cast aluminum shell with high thermal transference giving a refined look. High performance components and advanced electrical engineering are combined in the FA series, the end result is an amplifier that offers clean power and superior sound quality.