I posted this yesterday but it seems not to have worked so, once more........... I own a pair of very old AR-4x speakers which seem to differ from the norm in that they have a passive device in the top corner, diagonally above the tweeter; none of the images I can find on the webbie show this thing in place, they all have just the woofer and a tweeter. They have been here about 15 years awaiting re-rubbering of the surrounds and a crossover check/overhaul and still have the original AR-4x paper