If you want the best possible audio quality, try and get hold of one of the fifth generation iPods – model number A1136. (There is an excellent forum here on how to do the mod yourself!) According to the output audio quality rivals that of $1500 CD-players, with improved bass response and clear high end. Red Wine Audio offer mods of the 4th gen and 5th gen iPods where they will replace the output section of the iPod with high quality Black Gate NX-Hi-Q capacitors. My Shuffle first gen and also the second gen model A1204 (non-wolfson) sounds great, as does the iPhone 4S. The sound quality of course depends on more than just the chip that is used, so it’s not just about which chip is in the iPod. (That is an archived version, the updated website is here but it has less information.) 2. Other components. Check out these comments by Vinne from Red Wine Audio. Of all the iPods that use the Wolfson chips, the 5th generation iPods appear to be the best, followed by the 4th Generation iPods. It turns out that my two favourite iPods that i owned at the time of first discovering this – the Nano and my 4th Gen iPod – both had a Wolfson chip in them. When I detected this difference I didn’t know what a Wolfson chip was, but I could definitely hear a difference and so I did some research. The iPods I like the best seem to be those that use the Audio chips from the Scottish company Wolfson. The other is the combination of components along the audio path from the audio chip to the headphone jack – a mixture of op-amps, capacitors, resistors and inductors. It is called a Digital to Analog converter or DAC. This is the chip that converts the digital data into the actual sound. There are two main things that contribute to the sound quality of an iPod. The Audio Chip that is used – Cirrus iPod vs Wolfson Why is there a difference in iPod audio Quality? 1.
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