With PFFB design The AIYIMA A70 is the first stereo home audio Class D amplifier on the market based on the TI TPA3255 chip with a post-filter feedback loop (PFFB),The A70 Class D amplifier with PFFB implementation,it have no load dependency together with lower distortionWith 12V Trigger Input & RCA audio input The trigger input to allow one button power up of the audio chain from the source,Simple and convenient; There is a switch to add 3 dB of gain to RCA input. This gain switch can be used to boost the signal input at RCA inputsWith balanced input the AIYIMA A70 Stereo Amplifier with XLR audio signal input ,This design minimizes interference and reduces noise floorWith RCA & Sub output Add the sub output with variable filter output,The sub output is controlled by the volume setting,and Added adjustable cutoff frequency (20-150hz/20-600hz) for low-pass filter output,Easily build 2.1-channel Audio systems to match any of your desktop speakersProfessional Audio Components Simple appearance with professional audio components provides excellent performance,With a measured SINAD of up to 96dB and a SNR of 116dB, it delivers exceptional audio quality.Excellent in Class D amplifiers; And upgraded high-quality terminals help to install more robust speaker terminalsWith 48V 5A GaN Power Adapter The use of GaN transistors allows for high efficiency, low heat, safety, reliability and stability,to delivers strong amplification for your amplifier speakersReplaceable op-amp chips Explore subtle changes in sound quality by swapping out op-amp chips to add to your customization fun,such as Sparkos SS3602, MUSES02, OPA2604, OPA2134PA, OP249, AD827, RM4558, LM4562, LME49720HA, etc