Another CP200 ?

[Mikael Christensen]

Yes I know, it is me again !
When I use 70mm input, there is no signal on Le and Re.
Don't know if my cat.153 card is "programmed" correctly, I can't make heads or tail, to how those 153 cards function !!!!

cat 153dd.jpg

[Steve Guttag]

This would be a long discussion. Where don't you have signal on Le/Re? Do you have it at the meters? Are you judging by test film or a print. Most movies since the mid 70s, and definitely almost all post 1977 Star Wars, didn't record on those channels except for bass. So, you might get rumbing out of them. Those CP200s that were configured for subwoofers would have removed the links on the CAT 142 Cards and configured the CAT160 so that only from 100-250 would make it to Le/Re (for Dolby Stereo films). There were the rare exceptions that used all 5 speakers, post 1977 but it definitely wasn't the norm. Even those in the later '60s and early '70s often did "spread" mixes where Le/Re were just a sum of L and C or R and C (starting out as 4-track)...spread mixes muddied up the localization rather than helping, in my opinion.

Understanding the CAT153 is best done by studying the CAT153 page out of the manual (see in the warehouse) and the signal flow diagram, paying attention to the control lines going to each card.