All legacy ClarityCap models remain in production, but our retailers take different stocking positions depending on their individual marketing strategies. As CMR and CSA are priced close to MR and ESA, there is not much point in stocking deep inventory of both old and new models. Feedback from my OEMs is that CMR and CSA are meaningful steps up from MR and ESA. DTAC is an older line that remains popular particularly in Japan. DTAC aims to employ the narrowest films available in order to reduce ESR to an absolute minimum, but we subsequently came to understand that other factors than absolutely minimal ESR are more significant in determining sound quality: resonance control, winding tension, temperature treatments, and now copper lattice in place of tin/zinc end spray. In addition, DTAC's large donut-shape form factor can be a tough fit in some applications.
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