I have a set of Wharfedale SP-89 Sapphire towers and have 3 of the 4 woofers making coil noise. I have tried to contact wharf in England to replace and no luck(I'm not the first one to experience their lack of customer service). So I'm looking to buy 3 or 4 drivers..... I think they are marked 1550w it's the lower 2 woofers in the tower. What would be a possible replacement driver for this? Any ideas. All I know is the speaker rating is 200w RMS @ 8 ohms and the cabs are big 4ft tall 20 in deep 10 in wide. Ported. Thanks