Standalone DACs with no volume knobs usually have a fixed output when you set their volumes to max in Windows. Which is usually around 2Vrms ? For example, To use Atom DAC+ and SMSL SU-1 DACs you have to set their volumes to max in Windows and then they both output around ~2Vrms ?
(By DAC/AMPs I mean combo units like: (Topping DX5 , Creative G6/X7 , FX-Audio DAC-X6 MKII)
With Some DAC/AMPs, The volume knob affects the RCA-outs and with some, it doesn’t. some even have a switch to change between fixed and variable output.
Is my understanding correct ? please confirm.
I have some questions:
Why do some DAC/AMPs have variable output through their RCA-outs that is controlled by the volume knob ? When using them as DACs only, why don’t they just output a fixed signal (~ 2Vrms) like a standalone DAC ? Does turning the volume all the way to zero makes the DAC/AMP to output a fixed signal ?
Doesn’t the signal get degraded when the output is variable ?
When used as DACs only(USB-Optical to RCA-outs), Do the following units output a fixed or variable signal:?
FX-Audio DAC-X6 MKII