Sorry, can you explain that last part Mike?
Asitappens...I am casting about for a single 100mm (4") bass/mid drive unit to make a decent centre speaker for a 5.1 system I have acquired. The "thing" that cam with it sounds horrendous! Two 75mm speakers in 1/2 a "shoebox" made of plastic (rated at 250W! Yeah, in a pig's...!)
Now, in my investigations I have come across units by Audax, SEAS, Peerless and others and many of these speakers are used in commercial speaker systems so there is a good chance the D5s use something fairly readily available. The other factor (and more likely to fail but not much) is the amplifier/PSU and that likely uses pretty common power ICs.
Dave.