After Perth 350.5, what are the first steps of gradual change?

Pass Labs is the top X-0.5 pre-stage. Pass lab has produced new works for more than ten years. Even the X- 1000 post-stage with an output power of up to 1 kW can have the secret of exquisite sound quality. The key lies in Nelson Pass's patent "supersymmetry", which can achieve extremely low distortion with very little negative feedback and distinguish two single-ended pure Class A lines.