Pardales, what DACs have you compared the Altmann Attraction directly against? The page you kindly pointed us to is certainly interesting, yet statements like the following concern me:
"Like the BYOB amplifier, the complete electronic assembly of the Attraction DAC is vibrationally optimized, as the pcb is flat-press-mounted on a specially
treated spruce-board. This construction is time-consuming during manufacture, but improves sound quality, as all components are mechanically coupled to
a musical sound board."
Sound boards are part of the mechanical sound amplifier -- also called resonator -- found in most acoustic string instruments. They operate on mechanical vibrations ranging roughly from 20Hz to 20Khz, depending on size etc. . . I am not aware the operation of precision electronic is improved by having the chips tossed about on a surface tuned to vibrate at audible frequencies. If the Altmann design truly works, it may be one of those cases where a device excels in spite of its engineering principles, rather than because of them.
"Like the BYOB amplifier, the complete electronic assembly of the Attraction DAC is vibrationally optimized, as the pcb is flat-press-mounted on a specially
treated spruce-board. This construction is time-consuming during manufacture, but improves sound quality, as all components are mechanically coupled to
a musical sound board."
Sound boards are part of the mechanical sound amplifier -- also called resonator -- found in most acoustic string instruments. They operate on mechanical vibrations ranging roughly from 20Hz to 20Khz, depending on size etc. . . I am not aware the operation of precision electronic is improved by having the chips tossed about on a surface tuned to vibrate at audible frequencies. If the Altmann design truly works, it may be one of those cases where a device excels in spite of its engineering principles, rather than because of them.