At the heart of the D-1 lies the chipset. These were the most rigorously tested and selected versions of the TDA1541A, prized for their exceptional linearity and low-level detail.

The structural foundation relies on a 3.2mm thick copper-plated steel bottom chassis , wrapped in ultra-thick brushed aluminum side, rear, and top panels. The entire unit rests on a highly rigid 3-point grounding system made of heavy sintered alloy feet to completely damp out mechanical vibrations.