Discrete op-amp using cross-conductor current mode technology, upgrade preamp, DAC decoder, ear amplifier, phono amplifier, electronic crossover. Sound quality characteristics: sound field and its relaxed, transparent background. Play musical instruments texture round, very human. High-frequency delicate not hard, rich midrange. Low-frequency elasticity is powerful and enjoyable! The entire frequency band distribution is very even. The tone is biased toward the gallows, vinyl records, analog flavor full.