KODA HARMONY K-2000B mk 1 similar price point when they were new as new mk2, they are 10 years old model. My friend has those, if anyones wondering about build
Edit: Polipropylen (mk2 has kevlar) cone on bass unit, foil mpt capacitors on crossovers so all are within 5% tolerance of capacitance and will not dry out over the years, so it will always be within specs. EDIT: correction Taga Harmony is Polish distributor. Guangzhou KODA Electronics Co.,Ltd is full name of the maker or those loudspeakers.
Apparently price to quality ratio is insane. Dunno if they are making any serious money on those units. It's fairly low priced tbh.
And this is the one I always heard. And its a nice unit.
Yamaha A-S501 is also a nice unit, 9-10 years old so fairly new. Comparable to my vintage Yamaha A-960II. All Yamaha amplifiers have adjustable loudness feature. From what I googled you can buy used one for like $380-385. Your friend could squeeze it into $500 budget, I think.