You certainly aren't getting any speaker going correctly to 17 Hz even for ten times this price.
Stereo speakers are not made to go very low, that's what a subwoofer is for. Not all subwoofers even go that low!
Above $2500 for a good stereo system will get you a better sound, but as always, the more you pay, the less you'll be able to hear the difference. Also, the better the sound is, the more you'll have to be careful about amp pairing and room acoustic.
Right. I was including subwoofers in the cost of those systems approaching $2500. It's a broad topic, of course, and I'd already typed a zillion words. It's always a challenge what to type and what to leave out, huh?
A stereo system with subwoofers is still a stereo to me. My main system is 2.2 and I call it a stereo. But I see the confusion. Some people don't call it a "stereo" unless it's strictly 2.0!
Define "correctly". Frequency correct or audible correct? While 17hz is the floor for audible frequencies, even if you can hear it, you won't be able to perceive that much detail. In fact, I'd argue that a $2500 system with a subwoofer will sound the same as a $250 subwoofer, assuming the same sensitivity. Thing is, human ears are crap (imagine low-res gif pictures and thinking of it as 8k frames), and very very bad below 100Hz. What better/more expensive systems have (besides better quality components) is often better sensitivity, so a passing its not audible on your $100 system becames audible - not because frequency - but because sensititity (the cone is actually able to reproduce the faint sound)
Stereo speakers are not made to go very low, that's what a subwoofer is for. Not all subwoofers even go that low!
Above $2500 for a good stereo system will get you a better sound, but as always, the more you pay, the less you'll be able to hear the difference. Also, the better the sound is, the more you'll have to be careful about amp pairing and room acoustic.