so there will be some more... but i quiz'd julian alittle and got some words from him... i should have more later... but for now...
"We have known some of the Purifi developers for 15 years, since they previously worked at Texas Instruments and actually developed the amplifier IC that we still use in the P SIX DSP ultimate today. Since we are development partners of Texas Instruments and occasionally test new amplifier ICs that are still in the development stage in real applications, we have known the guys for a very long time.
A few years ago, these engineers quit TI and, together with a few other cool guys, founded Purifi to be able to realise even cooler concepts. Since we still maintain good contact with the engineers, we then came up with the idea of making their technology suitable for automotive use at some point in our discussions with them....
However, since the Purifi modules were not developed for use in the automotive environment, we then implemented this together with them. The whole thing took almost 3 years in total for development, because the automotive requirements and conditions are much more difficult than in the home audio sector. This applies to temperature resistance (0° - 70° for the home audio module), short-circuit resistance (not implemented in the home audio module as we do), controlled, noiseless switching on and off, as well as numerous other adjustments and the exclusive use of automotive components to meet our standards for emf and noise.
The whole thing was also a new development project for Purifi, in which numerous adjustments to the proprietary clock technology were necessary to make it automotive-compatible. Our circuitry thus has its own software, its own design and also its own feedback loops for the Class D concept, for example to also take our output relay into account in the feedback in front of the loudspeaker outputs. To achieve the absurdly good measurement values, we also had to develop a completely new power supply unit that works in all modern vehicles (6V - 18V operating voltage) and is fully regulated to include vehicles with intelligent alternator control and to equalise voltage dips.
At the same time, the power supply had to work even cleaner and more precisely than that of an MX4 PRO in order to achieve these absurdly good measurements, since any contamination of the supply voltage for the amplifiers naturally affects the performance of the Purifi circuit. Nothing better can come out than what goes in... The whole thing is also described quite well in the current Car & Hifi International"
i hope that this goes a little way to help understand what goes into a flagship product like this that is a step away from the norm and make a break through in performance levels