Hey, I have a pair of these speakers. My dad bought them new along with an HK 960 or 980. I eventually got rid of the 980. The treble sounded scratchy and the sound was generally flat. It may be been in need of restoration.
Well as fate would have it, I reclaimed a pair of these speakers from a friend who has had them in his garage for the last 10 years or so. I just hooked them up. First to a 1990's HK 7900, 170 watts, beyond clean power and huge requency range.
Compared to my other speakers, custom built from a Toronto store with really sweet and clear components, the 44's sounded flat and lifeless. The room, I would say is medium sized bedroom with typical stuff in it. When you look at the components of the 44, the drivers are all pre kevlar, carbon fibre, etc.
When speakers or an amplifier seem to have lots of "bass" is it because the lower frequencies are really present or are they clumped together and therefore sound more present? The bass drivers of the 44's are certainly not going to be up to modern comparisons. They are big and limp.
But the story doesn't end there. I hooked them up to a vintage HK 760, which many consider to be better than the 900 series. The old 760 had been professionally cleaned. The 760 is noisy compared to a modern amp and far less damping, BUT it has goobs of life because of those huge power sources. So it really grooves. Perfect for these old speakers.
If you want to try to remain vintage, look for such an amp that will kiss ass with these speakers and place them in a bright sounding room. Otherwise, put them in your garage and begin the quest to update. There is NO point in trying to replace drivers, that would be good money wasted.
There is without question a lot of hype in speakers, all all hi fi equipment. The only way to judge is to listen at home. Don't be afraid to look for used gear either. You can also search for a business that builds speakers and sample different drivers. A good speaker builder can customize a sound for you very effectively for less than the designer speakers.