What sometimes comes up is the way the volume control is made - digital vs analog.
Digital audio need not to convert to integer formats before it reaches DAC or SPDIF.
THE CHANNEL BALANCE PROBLEM: Devices with conventional volume controls may have audible channel imbalance at very low volumes [i.e., one side is much louder than the other --JDS]. It’s extremely difficult to manufacture volume control potentiometers that maintain tight channel balance below about -40 dB (referenced to full volume). - NwAvGuy
It’s 2013, and it’s finally time to say goodbye to the analog potentiometer. C5 features 64 steps of audibly perfect digital attenuation […] C5 presents only +/-0.1dB of deviation all the way down to -50dB, and only +/-0.55dB at -60dB! [Yes, you can only see 28 steps here, as I'm manually racing the dScope test duration by making larger volume transitions.]In other words, C5′s digital attenuation achieves perfect audible balance at volumes -20dB lower than the analog Alps RK097.
We seem to be comparing apples and oranges.We all agree on how old-fachioned analog potentiometers work, and their limitations. When we discuss digital volume control, however, we are talking about two different things: there is the all-digital multiplication of the values by a scale factor before sending them to a DAC; then there is the device that digitally selects one of several analog dividers after the DAC.So, what exactly are we discussing here?
Quote from: bennetng on 20 February, 2013, 10:41:39 AMDigital audio need not to convert to integer formats before it reaches DAC or SPDIF.I am not sure I understand this correctly, but how do you transfer floating point over spdif or which DAC (chip) takes floating point as input?
What I mean is we can change volume in floating point before it reaches DAC and SPDIF. For example, typical DAWs and even freeware like Audacity can change volume and save in floating point. Only in the final stage we need to convert to integer.
If you have a CD, a CD-player, some dac/pre-amp, an amplifier and a set of loudspeakers, doing floating-point digitalvolume is just another way to implement digital volume. You would still have the fundamental challenge of multiplication by a gain <1, (hopefully) dithering, requantizing to 16 or even 24 bits.-k
This is BTW the means by which contemporary AVRs implement their volume controls, even when there is a DSP in the signal flow.
Should I avoid AVRs and look for something more "sophisticated"?Can one buy a stereo amp for the same money (about 1000 Euros max.) that has a better volume control and do you know any that do?Or is this a trivial problem, i.e. lets forget about it and buy whatever has best feature/price relationship?
Analog has other problems as already mentioned in #8 http://www.hydrogenaudio.org/forums/index....st&p=824917
Wow, that is some interesting stuff to read here. QuoteThis is BTW the means by which contemporary AVRs implement their volume controls, even when there is a DSP in the signal flow.Do I understand that correctly that your typical AVR volume control is rather bad? Audibly bad?
Quote from: .halverhahn on 21 February, 2013, 06:11:44 PMAnalog has other problems as already mentioned in #8 http://www.hydrogenaudio.org/forums/index....st&p=824917Reading further down suggests that the issues raised are no longer relevant.There is no way I would ever spend a grand on an AVR.