I've owned Obelisk for more than twenty years. Without question the best amp for them is Bedini, at least 100 watts. The 25 watt amp will drive them and be very musical but will at some point run out of gas.I've used a Spatial Coherence pre amp with them and have turned plenty of high end heads with that combination. I don't know where you might find a Special but they are worth looking for.
Good luck in your search
Potsey
Good luck in your search
Potsey