Has anyone compared the two or had them? I found only slight improvements when MA went from the RS6 to the RX6. However some reviews say that the Silver 6 has some noticeable improvements over the RX6s, especially tighter bass. The RX6s can be had for around R7-8000 second hand and the Silver 6s for about R12-13000. Will the improvement of the silver 6s over the RX6s justify the extra R4-5000 do you think?