I've got a pair of Castle Severn 2 speakers and I suspect the woofer on one of the units could be on the way out. I considered looking out for a cheap scruffy offering on eBay from which I could cannibalise parts but there's no guarantee of of what I'll end up getting. I love these speakers, the finish is immaculate and they are capable of big deep sound with the right source but the 5 1/4 cone has a lot of work to do and does not take kindly to being driven aggressively. Looking to replace these with similar carbon fibre offering from Monacor (SPH-135c). I've heard this is a direct fit and with a 35mm coil compared to the original 25mm I suspect it could be a more robust unit...But will it sound good? Has anyone done this swap?