@mata7 Welcome to Audioholics!
Before recommending anything, I've got a question:
Are you looking for a stereo amplifier that is:
- A stand-alone amp that requires a separate pre-amp?
- Or are you looking for an integrated amp which combines a pre-amp and amp into one box?
Answer 1 will cost you more than answer 2. A separate pre-amp and amp will almost always cost more, and be more complex to hook up. But, despite what you may have read online, separates do not guarantee better sound quality over integrated amps.
Your
Cornwall 4 speakers are very sensitive according to the manufacturer. Klipsch claims 2.83 Volts (1 watt of power at 8 ohms) produces 104 dB when measured 1 meter away. That's very loud. Even if Klipsch is exaggerating, lets assume these speakers might have a more realistic sensitivity of about 90 to 95 dB. That is still very sensitive. You don't need a very powerful amp to drive these speakers at very loud levels. Any decent quality amp that can deliver an honest 100 wpc should easily drive your speakers to very loud levels.
(There are no industry standards for measuring sensitivity. Klipsch and others have been known to claim unusually high sensitivity values as a marketing effort.)
I agree with
@PENG when he recommended Class D amplifiers above. For $529 (US) you can get a stand-alone stereo amp from
Buckeye Amps that is capable of 150 wpc at 8 ohms and 250 wpc at 4 ohms. This amp uses the Hypex NCore 252MP module. For $699 (US), you can get 350 wpc at 8 ohms and 500 wpc at 4 ohms, using the Hypex NCore 502MP module. Either of these might be overkill for your speakers. But they are good examples of how low the cost is for extremely low-noise amplifiers with state-of-the-art solid state design. Both of these are stand-alone amplifiers that require a separate stereo pre-amp.
For well under $1000 (US), you can get a very good integrated stereo amp, capable of about 100 wpc. One good example is the
Yamaha A-S801. There are others.