By Mike Software 20/04/2010 Windows & Mac Set-up Guide Wavelength Audio, makers of high end DAC units have a fairly good step-by-step guide for setting up your PC or Mac for optimum audio quality. Ever wonder if you’re doing things the right way? Read it directly at their website: Macintosh Set Up Windows Set Up Mike Facebook Previous articleHQPlayer Audio Player for Windows Next articleNuforce uDAC (and comparisons) You may also like May 22, 2012 OS X Audio Players: Amarra, Audirvana, Pure Music, Fidelia, Decibel, and BitPerfect. November 10, 2011 Tim Murison’s BitPerfect for OSX cansman Hello, Benchmark Media provides a comprehensive explanation and instructions regarding bit-perfect and high quality upsampling music reply via iTunes for Windows and Mac OS X. Most of the information is still valid even though it was written for the earlier operating systems and iTunes software. Of significance is the fact that iTunes incorporates a very high quality 24-bit dithered software volume control which can be used freely without fear of introducing audible distortion caused by digital truncation (assuming that the hardware connected is also 24-bit capable). Please see the link for those interested. There are also some more well-informed articles within the site: http://www.benchmarkmedia.com/discuss/feedback/newsletter/2007/12/2/technology-update-itunes-7-windows-xp-and-mac-os-x Cheers! cansman http://www.headfonia.com Mike Thanks for the link cansman! http://www.headfonia.com Mike I have read the excellent article on the benchmark website, and basically it's talking about the excellent SRC (sample rate conversion) found in iTunes 7 (I assumes later versions as well). iTunes has made great improvements with version 7 under both Mac and Windows platforms. The sample-rate conversion, word-length handling, and volume control are all greatly improved. If the correct settings are applied, iTunes 7 can achieve very high quality playback for resolutions up to 24-bit, 96 kHz. In order to take advantage of the iTunes SRC converter performance, it's necessary to set the operating system's audio settings correctly. In Windows, for iTunes, it is done by setting up the sample rate through Quicktime, and in Mac, it's done by the AudioMidi set up. The easy, "Set in and forget it set up" for either Windows and Mac is to set the sample rate on Quicktime (Windows), or AudioMidi Set up (Mac), to 96kHz bit and leave it at that. This will cause lessser sample rate files to be resampled to 96kHz, in which Itunes' excellent SRC should do it with minimal impact to sonic quality. Also, by having iTunes locked at 96 kHz, all audio with sample rates below 96 kHz will be up-sampled to 96 kHz. This will cause virtually no loss in sonic quality, as the quality of iTunes’ SRC is very good – virtually inaudible. Also, by avoiding down-sampling by iTunes, this setting will never result in a loss of bandwidth (except with sample rates greater then 96 kHz). Last but not least, is that the volume control on Itunes 7 is a very high performance one. The Volume Control in iTunes v7 is very-high quality under both operating system. It is very well designed and operates at 24-bits for audio devices that support 24-bit operation. The end user should not hesitate to use the volume control in iTunes 7.x under either operating system. I think this last part about the volume control makes it very useful for people thinking about getting a volume control-less DAC unit such as the Dr. DAC Nano. http://www.facebook.com/destroysall Chris Allen I totally agree. iTunes seems to have improved tremendously with music playback on Windows 7. I did experience something odd. With WASAPI enabled on iTunes (through Quicktime settings), I found the sound to be much more “smooth”. I don’t want to call it recessed, but transparent in a way. So when I switch to the ‘Direct Sound’ option, I get a more solid sound and details pop out more. Your thoughts on this, Mike? http://www.headfonia.com Mike Well I am primarily a Mac guy, and I only use Windows rarely, when I need to test something that can only run on windows (or playing music from a friend’s computer during meets), so I can’t say, sorry.