Quote:
Originally Posted by Townyj 
You took the DF1704 over the PMD100.... I ordered mine "Mode A" reading from a few places that the PMD100 is alot better overall sounding. Ahh well suppose everyone is different 
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For an additional $30, you can order the extra filter module and have both Mode A and B (although not at the same time). That way, you would have the ability to hear them both and form your own opinion.
The filter modules are not designed to be changed back and forth on a regular basis (they are mounted on small circuit boards screwed down). If you look at the picture below, the filter module is the small board on the right with the HDCD chip.

I ordered both filter modules for my unit. My plan is to use the PMD100 until enough of my music is at least 96KHz, at which point I'll switch over to the DF1704. At the rate I'm going (only about 20 of the 8,000 songs I have today are 96KHz) it will be years before I make that change, but it's nice to know the DAC will be somewhat future-proof in the event that high sample rate music takes off.