“Would this amp be good for my infinity beta 50 speakers?”
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If the am reading the specs on your Infinity Beta50 speakers correctly, they appear to be rated up to 250W. This amp does not produce nearly that much power per channel to exceed the published rating of the speakers. It is rated at 140 per channel. The Denon Amps have a feature to "Auto Setup" your speakers. Using the feature, it goes through a sequence of test using a provided microphone receiver, to automatically adjust the sound settings for your environment and speakers and appears to also measure and take into consideration, the wattage of the attached speakers, including any center channel speaker and attached sub-woofer. If the Amp has more power per channel than the speaker is rated for, it appears to "limit" the maximum volume control setting on the amp, to keep you from blowing your speakers if they can't handle the amps power per channel. You can of course override this, but why risk blowing your speakers if they can't handle the rated wattage per channel of the amp. I have smaller speakers in my 5.2 configuration, that can't handle the full power of my Denon AVR-S650H amp (150W per channel) so the auto setup feature set a 75% volume limit during that speaker configuration setup. I have a neighbor that just purchased this particular AVR-S540BT amp you are inquiring about. While the rated power per channel of this amp is 140W per channel, my neighbor has very high quality speakers in his setup, and can handle the maximum power from the amp. The auto speaker configuration setup did not limit his maximum volume and allow him to crank it to 100%. Hope this helps!
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