Blackness is a very good description. Just like on your TV. If you can output true black or improve black level then some low level subtleties will be visible.
It isnt the same as hiss. Hiss can be ok - provided it is just random noise.
I think of blackness as tonal. There are no spurious tones. No IMD. No added timbre from the equipment. We hear spurious tones and they are a distraction that make subtle details harder to hear.
Common forms are jitter, IMD, DAC non-linearities, speaker resonances,speaker driver resonances, power supply hum, and of course stuff in your room that vibrates at characteristic tones - gyprock, furniture, floors,furnace/AC.
It isnt the same as hiss. Hiss can be ok - provided it is just random noise.
I think of blackness as tonal. There are no spurious tones. No IMD. No added timbre from the equipment. We hear spurious tones and they are a distraction that make subtle details harder to hear.
Common forms are jitter, IMD, DAC non-linearities, speaker resonances,speaker driver resonances, power supply hum, and of course stuff in your room that vibrates at characteristic tones - gyprock, furniture, floors,furnace/AC.