Like the finest Marantz "Reference" gear, the interior is heavily copper-plated. This provides an exceptional shield against Radio Frequency Interference (RFI) and Electromagnetic Interference (EMI).
If you'd like to explore more about this era of audio, I can help you with: Comparing the vs TDA1547 chipsets marantz project d-1
The Marantz Project D-1 represents a singular moment in high-end audio history where cost was no object and engineering was driven by pure sonic ambition. Released in the mid-1990s during the twilight of the first great digital era, this Digital-to-Analog Converter (DAC) remains a "holy grail" for audiophiles seeking the pinnacle of the Bitstream conversion method. The Genesis of a Masterpiece Like the finest Marantz "Reference" gear, the interior
At the heart of the Project D-1 lies the legendary Philips TDA1547 chipset, commonly known as the DAC7. While many manufacturers used this chip, Marantz’s implementation was peerless. Released in the mid-1990s during the twilight of
Unlike the "Multi-bit" ladder DACs of the era, the Project D-1 focused on perfecting the 1-bit Bitstream technology, aiming for superior linearity and a more "analog" fluid sound.
It paired these chips with the SM5842 digital filter, a high-performance 20-bit 8x oversampling filter that ensured a clean, phase-accurate signal before it even hit the analog stage. Over-Engineered Build Quality
It features a massive toroidal transformer with separate windings for the digital and analog sections to prevent cross-contamination of the delicate audio signal.