As you've seen, many/most here will advise you to be open to the benefits of a subwoofer.
That makes sense, but personally I too have been reluctant to add subs to my setup.
Putting aside price, at least for the moment, I got Genelec 8351b's a few months ago and their bass performance knocks my socks off. Again, it is not hard to find members here who say the 51's need a sub, and I am not trying to argue with them or say they're wrong - but for me personally, I feel no such need.
The point of all this is that here's the 8351b's Klippel response, from Amir's review here on ASR:
View attachment 354205
The F3 - the point at which the bass response is down no more than 3dB from the average response in the rest of the spectrum - looks to be about 33 or 34Hz from Amir's results, which agrees very well with Genelec's official spec of 32Hz.
Prior to the Genelecs I had a pair of B&W 705s. Totally different class of speaker of course, but their F3, I believe, is around 45Hz.
The difference in my experience is massive - as in, I had the subwoofer-type experience one member described above: some music has bass lines that I never really heard before with the 705s. And the approx. 50Hz kick-drum impact is also night and day with the Genelecs compared to the B&Ws.
So I would say a rough guide is that if you want active, stand-mount speakers without a subwoofer and you want to feel "good bass," look for speakers with an F3 no higher than 40Hz, and ideally a little below that.
That does rule out a lot of speakers, especially at lower price points. There's a reason a lot of stand mount speakers roll off precipitously below 50Hz - it's harder and more expensive to design in and implement clean bass below that. I'm not a "bass head" and personally I couldn't care less about the 20Hz to 30Hz range. But I have found that the 15-20 cycles between 30-35Hz and 50Hz make a huge difference.
YMMV of course.