Thanks for the responses, friends. Here is a bit of additional background information...
The Deluxe upgrade program started with the DNA-1, and consisted of replacing a selected set of parts with higher-performance, more expensive parts for improved performance. In the case of the DNA-1, the RCA jacks and speaker terminals were upgraded to Cardas, and several critical resistors were upgraded to Vishay and Caddock. The regulated power supply rectifier diodes were replaced with soft-recovery units from Harris, and the output wiring was upgraded to Van den Hul. These changes resulted in a nice performance enhancement at a very reasonable cost. The Deluxe program proved to be so popular that we extended it to include most of the products produced at McCormack Audio.
Some people have wondered why I didnt simply make one model with the improved specs. The original reason is simple I wanted to bring the DNA-1 to market at under $2000. This was very difficult to do while achieving my performance goals, and would have been impossible with the added Deluxe parts cost. Setting-up the Deluxe program separately allowed me to offer improved performance while still giving the customer the choice of a lower-cost model. This option was carried-over to many of our other products, and proved to be popular there, as well.
Further information about upgrade options is available on my website - www.SMcAudio.com