Both the Marantz NR1510 that Amir reviewed and the NR1710 that I measured both suffer from 100 Hz jitter noise in the digital section that previous models lacked. These models have also added a RIAA input and a chassie GND for grounding.
The signal ground appears to the connected to chassis at the CBL/SAT analogue input. The RIAA chassis GND is connected to signal ground via two capacitors. Chassie GND is also connected to the ground of the digital PSU. Is the RIAA GND connection a source of ground loop that pollutes the digital signal with 100 Hz noise?
I can post the schematics a bit later.
Here it is attached.
The signal ground appears to the connected to chassis at the CBL/SAT analogue input. The RIAA chassis GND is connected to signal ground via two capacitors. Chassie GND is also connected to the ground of the digital PSU. Is the RIAA GND connection a source of ground loop that pollutes the digital signal with 100 Hz noise?
I can post the schematics a bit later.
Here it is attached.
Attachments
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