Bitperfect vs amarra
So a great test is to get some ac3 encoded wav file’s, dial in stuff to what you think are zero gain, 100% bitperfect and then conect the digital out to a home theatre processor or reciever and listen you get 5.1 sound or noise. The thing is this must be bitperfect or the encoding gets lost and you get gibberish. There are signals that’s usually are packed/disguised in regular pcm namely hdcd & DTS or ac3 ( Dolby digital ) that’s how for example a DVD player sends ac3 over spdiff or toslink to a ht-reciver.
But here it goes.īack when I thought this was very important I’ve used some test to indirectly verify that the transfer really was bitperfect. You can dig out some old treads about this too. Off the top of my head, I have only seen one DAC that had volume control that didn't affect the bit stream because it was actually a DAC/Pre-amp so the volume control on the remote controlled the analog pre-amp's various inputs as the output of the device went directly to the amplifier. Almost all DACs and Digital Output devices that can control Volume do so in the digital domain all at the cost of Bit Perfect. If it happens in the analog section, then the data has been decoded, the DAC has done its job, and the analog level is being adjusted which doesn't affect the Bit Stream because all that was already completed. If it is being done in the Digital Domain, the stream is no longer Bit Perfect.
Bitperfect vs amarra software#
Is there any way with pCP to do that? I mean disble the software volume control and enable the hardware one?ĭoesn't matter what one calls it, the only point that matters is "Where" the volume control is actually happening:
Bitperfect vs amarra install#
My DAC come with a driver for Windows that install a little app in the Windows bar and so, for example with JRiver, I disable the software volume control and control the volume with this little app that communicate to the DAC itself. Looking aroud, seems that letting the player modify the volume it is called "software volume control", while controlling the volume by tellig to do it to the DAC is called "hardware volume control".
Since my DAC is capable to control the volume and the documentation says that in case the player is capable of controlling the volume by delegate the DAC.
It's done in 24 bits, so any rounding errors are several orders of magnitude below the noise floor introduced in even the best amplifier chains. Set the volume to 100, that's all you need.īut, remember, software volume control is good as long as your gain chain is ok.