Can't say I found anything even remotely similar with mine as far as sounding different or wrong or anything.
Along the lines of what "Firemoon" is saying, I found their greatest strengths to be amazing dynamics, slam, speed etc when driven by a big amp (I mainly used a Musical Fidelity A370 with mine). Excellent power handling and ability to go loud cleanly for a speaker of its type and size. That they combine this with good transparency and pretty low colouration generally made them the dog's bollocks for me for many years.... lots of other speakers came in and were quickly humiliated by the 770's! Rogers LS7's were good but had nothing like the same ability to go loud and offer big dynamics.
Ultimately for me their big flaw that led to Spendors gradually taking over as my daily speakers was that although low colouration in general there is (with mine anyway) a hardness/harshness in a specific frequency range around or just above the crossover frequency that can make them really unforgiving of, as a good example, 80's digital recordings. Deliberately bright and sibilant stuff like George Michael recordings (the worst offender I can think of!) could take the enamel of your teeth from 30 paces!