Guest speedracer Posted August 18, 2007 Report Share Posted August 18, 2007 If 12:00 is "norm' should there be equal "travel" on the "pot" between the decrease side and increase side ?? Link to comment Share on other sites More sharing options...
johnieo Posted August 18, 2007 Report Share Posted August 18, 2007 Hi Speedracer:The white dot setting is not the pot midpoint. If you examine the backside of the crossover board, you may find an indentation in the Masonite for the pot "tab" that remained after the locking nut was tightened. When replacing, put the tab back in that indentation. If the original position was lost, one can look in the Archives under early AR, then under AR-3a for an annotated crossover circuit. There are two or three crossover drawings; one of them states the correct resistance value between terminals 1 and B for the mid, and for the tweet. The mid and tweet settings do not have the same resistance.Cheers, Link to comment Share on other sites More sharing options...
RoyC Posted August 18, 2007 Report Share Posted August 18, 2007 >If 12:00 is "norm' should there be equal>"travel" on the "pot" between the decrease>side and increase side ?Attached are 2 photos of the AR-3a pot settings...The first shows the positions at full "increase", and the second at full "decrease".Note that it is different for the mid and tweeter, and that neither have equal travel between the "optimal dot" and full on or off.If l-pads are used to replace the potentiometers, the optimal positions will change as well.Royhttp://www.classicspeakerpages.net/dc/user_files/2610.jpghttp://www.classicspeakerpages.net/dc/user_files/2611.jpg Link to comment Share on other sites More sharing options...
Guest speedracer Posted August 18, 2007 Report Share Posted August 18, 2007 Thanks for the help, I have #a's also and the person I bought them from said he had "fixed" the pots so I was wondering why there was so much "play" in them. Thanks again. Link to comment Share on other sites More sharing options...
dynaco_dan Posted August 19, 2007 Report Share Posted August 19, 2007 Hi there;You may find that the pot nuts may need to tightened just a smidgen more only. Link to comment Share on other sites More sharing options...
Guest speedracer Posted August 19, 2007 Report Share Posted August 19, 2007 they seem "tight" but might be "off" / "norm" centered ?? Link to comment Share on other sites More sharing options...
dynaco_dan Posted August 19, 2007 Report Share Posted August 19, 2007 Hi again;I only mentioned that tip because of your, "lots of play comment".If the nuts are, what you consider adequately tight, then leave them alone and accept that is normal tolerance play.The pots are not easily turned in the panel if the nuts are loose, as there is wires soldered inside the enclosure that should prevent that happening. Link to comment Share on other sites More sharing options...
Guest speedracer Posted August 19, 2007 Report Share Posted August 19, 2007 Sorry, I guess what I meant was the pots seemed to "spin" more to one side than another ??? So I thought I figured they were "off" centered. Link to comment Share on other sites More sharing options...
RoyC Posted August 19, 2007 Report Share Posted August 19, 2007 >Hi Speedracer:>>The white dot setting is not the pot midpoint. If you examine>the backside of the crossover board, you may find an>indentation in the Masonite for the pot "tab" Here is a photo of the indentation and pot tab, mentioned by John.Royhttp://www.classicspeakerpages.net/dc/user_files/2614.jpg Link to comment Share on other sites More sharing options...
Guest speedracer Posted August 19, 2007 Report Share Posted August 19, 2007 Got it, thanks. I've never opened one these, woofer comes out and some / all of the "stuffing" and there it shall be ? Link to comment Share on other sites More sharing options...
RoyC Posted August 19, 2007 Report Share Posted August 19, 2007 >Got it, thanks. I've never opened one these, woofer comes out>and some / all of the "stuffing" and there it shall>be ?Yes, but getting into these beasts can be a pain in the buns.If you have an earlier version, it may require some patience and prying to free the woofer of the putty gasket. Once inside, you may find chunks of nasty rockwool. It should be saved in separate bags to insure that the appropriate amount gets returned into each cabinet (assuming the proper amount was returned to the cabinets the last time they were opened). Later versions use more friendly foam gaskets and yellow fiberglass. It is best to handle the stuffing outdoors.The pots are held in place by the nuts on the outside of the cabinet.The crossover wires have very little play, making it difficult to remove and manipulate the pots. If necessary, removing the cabinet terminal screws will make it easier.Roy Link to comment Share on other sites More sharing options...
Recommended Posts
Archived
This topic is now archived and is closed to further replies.