Hello
@LETRA . Your order has actually been shipped. I hope that you did receive our emails informing about the additional delays and didn't worry too much whether you would receive your amp or not.
The product description has not changed (apart some typo) since we started selling the Arthur 4216/E2. The composite topology consist in splitting the tasks between opamps, one supplying the current, the other controlling the noise and distortion.
The input stage was completely redesigned. 4 layers PCB and ultra low noise regulators are the main changes - in addition to the composite opamp - compared to the previous generation.