I thought that I'd start a thread on this as the standard audio system in the Model S is rather 'meh'. It lacks both dynamics and resolution and although the 3 band equaliser allows the frequency response to be tailored to sound more 'exciting', that isn't exactly the same as having good sound and does nothing for the resolution. I know that there is a whole sub forum full of posts on audio upgrades but not all these products are readily available here. I think that the main issues in an upgrade path for both the standard and the upgraded OEM system are the original system's use of 2 ohm drivers. i know that rated impedance is nominal and actually varies across the frequency range, and that other specs like driver efficiency are also important but there seem to be few quality options that I can find for the simplest of upgrades - a 'like for like' exchange. The other option is more complex, taking the outputs from the 'virtual head unit' and using an external power amp that opens the choice to include most quality 4 ohm drivers. Has anyone looked into the options?