I generally consider low-fi under 1K, mid-fi 1 to 5K and hi-fi over 5K in speakers, perhaps half of that in component prices.
Of course you can get hifi sound from speakers for 3K and midfi sound from speakers for 7K. It depends on about 25 things.
Primarily your ears :)
Overall, low-fi is still a "fi" better than cheap computer speakers, JBL bluetooth stuff, or other sound producing monsters.