[Scott Dorsey]

nickbatz wrote:
If the slope of the rolloff is very sharp (sharper than 6dB/octave), they
likely were designed to have been used with a subwoofer. They are from that
era where the sat/sub thing was becoming very popular.

Could be, and the rolloff is pretty steep. There actually is some useful response at 40, but between 60 and 30 there's more than a 6dB cut.

But these are tower speakers, and the RSL brochure I found online with similar-looking speakers (except passive radiators, hence my original assumption) didn't have a sub in it.

I'd expect there to be a crossover to the sub built in, even though these are passive xovers. Still, whether or not that was the design, Ima try hooking up my Blue Sky sub just for fun.

The crossover might be built in, it's mechanical. No, we wouldn't do that
today, and yeah, it's a bad idea, but check out the Triad System Model One for
instance.

By the way, Manny LaCarubba (Sausalito Audioworks), who's as good a speaker designer as there is, uses subs in his systems. The twist is that he uses multiple ones, not just a single one. So it's not just that era!

At what point does it cease becoming a subwoofer and become a woofer?
--scott
--
"C'est un Nagra. C'est suisse, et tres, tres precis."