The 33 was a smaller and possibly bass-friendlier version of the 44 (I never compared them side by side as the 44 had gone by then IIRC).

The 25 was spoiled bu the two HF1300's interfering with each other and was the odd one out IMO.

As for the 66's, the models that replaced them and the beovox 5702 (a smaller "version" pretty well - oh yeah man.. Wonderful things!!!!!!