Features: traditional power upgrade, nothing more than add filters or isolation transformers, although you can increase the signal to noise ratio, against surges, but get little dynamic and adversely affect the sound field is not a good way. F1000 customize special components, passive filtration system, focusing on a targeted treatment on quality, image influential UHF portion of the negative factors affecting the sound quality to minimize low frequency does not compress the high-frequency not...

Features: QA690 is a Hi-End Full Digital Stereo Amplifier, It is based on the QA100 with improvementon the circuit, We spent over 3 years on developing and continuing optimizationthrough testing more than 10 major hardware version. This is a true competitor to most of the Stereo Amplifier, complicated power supply systems and clock circuits. Our target: “Perfectly and accurately recovery for the music recordings, and deep dark background”. QA690 is able to drive 4Ω@160W-8Ω@100W2 way...