Also take into account that the Pentas are getting old.
I have the MK3 Pentas in storage, and I haven't used them for years, however, the last time I used them they were getting less precise sound wise IMHO compared to when they were new. They are about 12 years old. Very little used, but i think the drivers degrade with time, and might be a factor?
They are good, if you like the kind of sound that Alex described. He hit it right on the nail with his explanation.
Was the Pentas you heard active or passive version? There are 4 types, Passive, active in mk1, mk2 and mk3. If Active, they will be fed only the signal with only pre-amp from your current system. So make sure there's a pre-amp out on your amp/receiver.
-Andreas
BLab5, BLab5000, BLab8000, BV10, BS9000, BS3, Beo5, Beo4, BLink1000, BLink5000, BLink7000, A2, A8, Form2