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Are you looking for an integrated amp or separates? Your vintage Polk speakers seem to demand quite a bit of power in order to shine. I would get separates....and I would look into used gears if your budget is only around $500. Some people love Emotiva amps and some hate them. IMO Emotiva amps offer great value best bang for your buck kinda thing and they usually have plenty of power for very reasonable prices but IMO they don't sound very musical at all but they are good for home theater applications but not for music.
I would look into a used Rotel RB-1080 power amp and a used Rotel or NAD preamp. The Rotel RB-1080 power amp can he had pretty cheap nowadays less than $400 or even $250. It originally did retail for $1k when new and this model was first introduced in 2001 and discontinued in 2008. Highly recommended especially for the money that you can get these days. Very musical with plenty of power. It's rated at 200 wpc @ 8 ohms and close to 400 wpc @ 4 ohms and is stable down to 2 ohms.
Btw, I loved older vintage Polk speakers and don't care much of their newer current models.
Hope this helps and good luck.
I very much doubt that those speakers need that kind of power to drive them.
I had a pair of Polk RTA12 speakers, which a somewhat similar design, and they worked great with a 50 watt amplifier.
Check the sensitivity specification. If it is 88 db per watt or higher, almost any amp over 50 watts will work well.
The 500 watt rating is not really relevant as far as power required goes; the sensitivity is what you must look at.
Cylontymany is actually right on the money. I have a pair of Polk SDA 2Bs that I purchased new, and over the years I've been able to confirm that these speakers need a LOT of power. My old Onkyo 100w integrated died driving these, though that was a heavy unit. I am actually driving them through a Rotel 1080 that I picked up used and couldn't be happier about. It really does provide a lot of bang for the buck. It is paired with a nOrh ACA2b Preamplifier, which is a tube preamp, and the system sounds great. Main point - get a very powerful amp to drive these speakers correctly. They draw current at low ohms (2) which is very demanding. I would also suggest a used Adcom power amp, like the 555 II. In closing, you have a fine pair of speakers. I love mine. Make sure you have the interconnect cable between the two!