The amplifier and all electronics of BL3000/4500 are quite the same. The 4500 is just bigger… and more loudspeakers.
I think you mean the BL5000 as being the bigger speakers. BL4500 appear to be just like BL3000 but with green displays, like the last build of Pentas. I wonder if they sound any different to the BL3000s?
Without a specialist checking these old hardware it’s very frustrating… 90% are simply dead ore unusable. But if its done and they are working: NICE!
Thank you for your comments – I remain ever hopeful of finding a good pair of these BL3000 wall-hangers. They’re so cool!
Julian