Hi @Deeg,
NSC 222 Volume control
The left and right volume controls are completely independent. This allows the left/right balance to be set for all inputs at zero loss of sound quality (unlike a separate balance potentiometer or DSP)
The volume control is ‘fly-by-wire’. An ARM chip sends signals to reed-relays, the relays select tappings from a fixed resistor chain. The higher up the chain the louder the signal and the lower down the chain the quieter the signal.
(Reed relays are electrically controlled switches. The switch contacts are hermetically sealed in a glass tube. The control side is galvanically isolated from the signal side)
Being fly by wire also allows inputs to have their respective sensitivities set. e.g. boost MM by 3dB. When an input is selected an ‘off-set’ is added to the master volume level, as is the balance off-set. Balance and input sensitivities settings therefore have zero effect on sound quality.
The ARM also keeps a second master volume setting for headphones. This way there’s no surprises when pulling out the headphones after a loud session.
…yes, this volume control architecture is also used on Statement (pure analogue pre-amp) and will be used on future products.
Cheers
Steve