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Message: <blockquote data-quote="MisterN" data-source="post: 937893" data-attributes="member: 25715">There are many factors that can affect the signal bring sent through from your PC to your amp.The goal for most is to get the FLAC file data sent to the amp untouched. This is commonly called bitperfect playback. If you can't hear the difference between your CD player and your PC then your all set. Don't worry about messing around.One of the key concerns is resampling. Most DVDs and movies use a 48k sampling rate. However CDs use a 44k sampling rate. Most on-board and cheaper sound cards are limited to sending a 48k signal through their SPDIF and optical ports. As 44k and 48k are not easily divisible between each other, the PC needs to mathematically resample all 44k signals to 48k. This is what gets sent to your amp. This mathematical algorithm is not of an extremely high quality in Windows. It is more geared to keeping CPU load low. Thus the quality suffers. To me it is most notable in the high frequencies such as symbols. Mixing issuesEven if your hardware supports sending 44k signal from your music player to your amp, if you play it through mediaportal or Windows media player it will get resampled to 48k. Why? Well Windows needs to support the playback of multiple sources at once. For example background music and a menu selection tick noise. This default mode in Windows is called shared mode. Windows will mathematically mix the sounds into one signal before sending it to your amp. Clearly if the sample rates of the sound sources are different it will need to first convert them to a standard rate. It actually always converts to a default rate of 48k. This is actually overridable deep within Windows settings. However changing this will affect the sound quality of movies since they are recorded at 48k. Windows also supports exclusive mode playback. It gives exclusive access to the sound card to the playback program. It will not be able to playback multiple sound sources at once. However it won't resample the signal due to the need for mixing.Music playerThe music player must use one of the various ways Windows supports provides to gets activate exclusive mode. For example ASIO or WASAPI. It must also set the output sample rate such that it matches the source files sample rate. Of course the number of channels and bitdepth also need to be matched. Unfortunately the options presently available in mediaportal don't do this. Refer to my previous post on how I currently work around this. I have quite a collection of 96k and 88k FLAC recordings ripped from DVD audio. It is especially noticeable on those sources when they are resampled to 48k.Windows and player volume controls and equalisersIf the Windows or player volume controls are not set to 100% then the signal will require remixing. Use your amp volume control instead. The same applies for equalisers. Most software equalisers built into music players are implemented quite badly.I've really only scratched the surface. As you can see there are many things that can get in the way of making PC's great music playback devices.</blockquote>

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