First and foremost is the stunning stainless steel chassis, which is polished like a mirror.
Stainless steel is an alloy of iron, chromium, and nickel, and the higher the ratio of chromium and nickel, the higher quality and higher grade the stainless steel. The stainless steel used by Astro Electronics is an 18-18 ratio. Since the stainless steel used for general tableware is 18-8, 18-10, which is said to be quite high quality cutlery, it means that Astrodenshi's stainless steel chassis is a very high quality product. You can tell by touching it, it is pleasantly slippery.
The stainless steel is quite thick, 2 mm and 3 mm (VIP, SP, MK series).
The extremely hard stainless steel is bent using a special technique to create a robust chassis with no seams, which is a characteristic of Astrodenshi.
This robust and beautiful chassis, coupled with its weight (very heavy), increases the vibration control and isolation effect.
The cost of the chassis alone for a full-size amplifier can be as much as 200,000 yen! The cost of the chassis alone for a full-size amplifier can be as much as 200,000 yen!
Furthermore, Astro Denshi uses oxygen-free copper plates or 18-18 stainless steel inside the stainless steel chassis in a two-tiered structure for reinforcement or mounting parts. Of course, it has a mirror finish.