It is too bad about the poor S/N they should address that. I have long thought that passive speakers basically need to be phased out. With all the channels now, a receiver and passive crossovers are just not fit for purpose anymore.
One thing that might be an issue with the poor S/N, is that the woofers may have, and likely do have, a peak above crossover. Since there is a direct connection between the speaker and amp, a speaker peak above crossover will allow hiss to be heard.
This is a real problem. My SEAS 10" drivers have a huge peak out of band. Even with my Quad 909s with their 105 db unweighted S/N you can hear hiss from those drivers easily at the seated position. So I had to design and build notch filters for the speaker leads, to notch out the peak. Then the hiss was totally eliminated.
I have mentioned this before, but people fail to understand why I would put a passive notch filter in the connection to a speaker in an active system. To me the reason is obvious, but apparently not to others.