Having recently acquired an Acute 600B pack (which is awesome!), I decided to acquire an Acute Twin head to experiment a bit (lower flash durations, and higher power potential if I acquire more packs in the future). In testing the Twin head on the 600B pack I noticed a few things.
As expected, both tubes on the Twin head pop when connected to the 600B pack, and the modelling light doesn't work (I don't have the adaptor). This is all as expected, however I haven't heard the fan come on yet, but haven't really done much more than fire it at full power a few times in succession. At this point I'm unsure of whether the fan isn't on because it doesn't need to be, it won't ever be on the 600B pack, or, worse, it is broken and I need to return it to the seller. My questions are:
1) Can the 600B pack supply the power to the fan on non-B Acute/D4 (Twin) heads if required?
2) Does the fan on Acute/D4 heads only turn on when it heats up, or should I hear it as soon as I fire the pack up?
3) If I won't be using the primary source of heat on the head (the modelling light), do I even *need* the fan to run at any time?
I'm going to ask my dealer if I can come by and test the head with an Acute/D4 head so I can at least make sure everything works properly. I doubt I would cause any heat issues at my shooting pace if the fan was indeed broken (also, the Acute B head seems to do ok popping at up to 600ws without a fan), but I would prefer it to kick in if it was needed instead of melting something... especially if I acquired another 600B pack and fired it at 1200ws.