It's funny- the person I bought the 909 from also suggested the Rega Vulcan Sub. However, I acutally use a Velodyne servo sub and just use the pre-out line level to the sub and likewise run the speakers full range (there's a balanced quadlink cable connecting the amp and preamp).
In any case, the voice coils are only $6 each so you may want to order a spare while they still exist.
In any case, the voice coils are only $6 each so you may want to order a spare while they still exist.