George,
According to the v6 datasheet the 'processing/DSP and Comms cards are unchanged from the previous version of 861' but they do go on to say that is can handle 'between 2 (default) and 10 processor cards'.
They even have the same part numbers CO00, CD20 & EF20.
Which leads on to the question of why a v4 couldn't be upgraded to a v6. It looks like only the I/O cards where changed.
Duncs Dollars and cents....
Audio: Triad Monitor Golds, Surround Golds, Silver Subwoofers; Procella P-18 Subwoofer; QSC DCA 16622s, 1644, 3422, BASIS 922uz; ADA MACH IV B
Other: APC S-15s; Crestron
Sources and Video: Ran out of characters .....................
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