Well, I've been looking more closely into the specifics of the SuperDAC 2496, and have come across a few interesting things...\r\n\r\nThe first time I opened it up, I couldn't find a local oscillator. I assumed I wasn't looking hard enough. Today I opened it up again, and still can't. So, I did a little research...\r\n\r\nThe CS8414 digital interface decoder chip that is used in the superdac is the answer. This chip regenerates the clock from the incoming datastream. It has a PLL on board to lock to that. There is also a voltage controlled oscillator within the chip (presumably for when there is no input signal). The 8414 then gives this clock as an output for the DAC (the rather unassuming AKM AK4393).\r\n\r\nSo what? Why do we care? Simple... it means you can't reclock the superDAC. It relies on the accuracy of the clock in the transport. Thus you will see significant gains in the performance of the superdac if you reclock the transport to which it is connected. This would also explain why WM has had much success with it, with his highly modified, clocked transports. \r\n\r\nThis also suggests that the superDAC will be more responsive to transport differences than, say, the DAC64 is, with its FIFO input buffering and local reclocking. \r\n\r\nA further, slightly less technical musing is that I have found the superDAC to respond a lot to being attached to the trichord powerblock with a eupen. The on-board rectification of the 9V (external transformer) AC input is done by 1N4001 diodes (the cheapest of cheap diodes... the sort that you give to school kids). With the level of difference I found with the change in power source, this suggests that an improvement (for example to a 30p 1N5821 schottky) in the rectification could have some surprisingly large effects (especially for the meagre sum of £1.20). Of course, some improvements to the caps on board would also not go amiss, as the present electrolytics are VLSOM 20% (basic, cheapy ones). A few black gates, OSCONs or whatever fancy caps are your fancy could do quite a bit. \r\n\r\nOf course, WM already mentioned changing the op-amps from the sub 50p NE5534s. Again, this may come down to personal preference (AD825s, OPA604s, etc). Also, WM mentioned biasing the outputs to class A. \r\n\r\nWith all of these modifications, you will have changed a significant proportion of the components in the device. Beyond that, there is stuff like improving shielding (perhaps some ERS, or otherwise the traditional copper) and of course the improvement of the external psu (I started with this because my superdac came without the original psu, so I had to build or buy one anyway).\r\n\r\nAll in all, by putting a little money into modding and providing it with clean power, I think the superdac is a seriously capable bit of kit. It needs good ancillaries though!