Quote:
Originally Posted by
I_quadius 
Just an observation, you appear to be advertising 2 separate dacs? The "micro" is the cheaper $299. version, & the "ultra" is a $1200. high-end desk-top model.
hmm, don't understand what exactly you meant. I am selling a "Headroom Ultra Micro DAC" as mentioned in the title and the description. I believe these units have "max" modules inside them.
Ultra Micro DAC
The Ultra Micro DAC is able to buffer USB from your computer for low-jitter smoothness; able to strip S/PDIF digital data from optical or coax inputs in a single flick of a switch; as well as source a sweet analog signal for your favorite headphone or speaker based back-end.
Discontinued 2010.
Ultra Micro DAC Manual (pdf)
Ultra Micro Amp
The Ultra Micro Amp uses TI 627 op-amps, outstanding quality metal film resistors and poly-film caps to completely fill the space right between your ears with glorious music while only taking up very little space on your desktop.
Discontinued 2009
Ultra Micro Amp Manual (pdf)
After a slew of requests from our more peripatetic audiophile customers, HeadRoom now offers an excellent Astrodyne 'auto-switching' power supply that provides clean, robust current for the HeadRoom Desktop Amp, Ultra Desktop Amp, Balanced Ultra Desktop Amp [The BUDA], Ultra Desktop DAC [The UDAC], and our AC-power (non-portable) HeadRoom Micro products -- without having to necessarily shell out for our top-shelf HeadRoom Desktop Power Supply [DPS]. The Astrodyne will work anywhere on the planet you can find an outlet so no need to have several power supplies in different voltages for each country of destination. However, please keep in mind the high-current, high-performance HeadRoom DPS remains highly recommended for maximum audio performance with any of our superb top-level HeadRoom "Ultra" headphone amps and DACs.
The Astrodyne shows nice performance gains over the linear regulated AC 'brick' always included with HeadRoom Micro & HeadRoom Desktop models. The Astrodyne measures exceedingly low current ripple in our lab bench tests and has a very precise quick-response voltage regulator tracking circuit that is significantly superior to the one in the brick power supply. The Astrodyne input voltage is 'auto-selecting' and will operate with any worldwide voltage by simply using a standard IEC power cable suitable for that country's plug type
. 
NOTE: if you have any questions, please carry on via PMs.
Edited by Ooztuncer - 7/8/11 at 2:21am