You're right. iFi audio devices share our own proprietary tech, REclock/REbalance/REgen for example. Hence say digital treatment tools (different iPurifiers, iUSB3.0) work best not with our own products, but goods made by other manufacturers. To make this more understandable, our iUSB3.0 is the best and the most complex USB treatment tool we currently have (iGalvanic3.0 aside, that's a different story) and this product's functionality we weren't able to fit in i.e. iDSD BL. But the latter shares some tech with the former and its USB input is already treated to some extent, hence quite good on its own. This is the reason why after adding iUSB3.0 before iDSD BL the outcome is usually slight improvement. But DACs made by many different manufacturers? Now that's a completely different story... We could strip i.e. our DACs from some tech and say that in order to get the very best out of them, several complimentary products made by us have to be bought, yet we don't. Our mindset is different. We always push ourselves to cover as many bases as possible. We always aim to give our customers the best we are able to squeeze in a given chassis as usually that's the limiting factor.