T+A call this circuit concept ICA (Isolated Current Amplifier), and developed it years ago for the R-series components.
The individual stages are of extremely linear, broadband design, with the result that the AMP 8 requires very low levels of “overall” negative feedback; the bandwidth is more than 200 kHz! T+A engineers have invested tremendous effort in creating a circuit track layout with absolutely minimal inductivity, thereby helping to achieve a superb transient and dynamic response.
At the critical points in the circuit which are crucial to sound quality T+A employs carefully selected audiophile components such as magnetic Vishay resistors and special WIMA and ELNA audio capacitors! The mains power supply is designed to cope with extremely severe and difficult loads. Its toroidal transformer generates up to 400 Watts whilst maintaining low leakage fields, and is capable of driving even very demanding loudspeakers effortlessly.
The power supplies for the amplifier stages are completely separate for each channel, and feature their own reservoir capacity and buffering. In consequence, there is no trace of the interaction of any kind between the channels.