The RX-4105 uses totally discrete amplifiers for all channels (TDAS) to maintain its high power and low distortion. Use the receiver's A and B clip-type speaker outputs to power 2 different rooms, or to biwire a pair of speakers for more efficient amplification (with A outputs driving the woofers, for instance, and the B outputs driving the tweeters--make sure your speakers are compatible if this is a key feature for you).
The receiver also offers a handy 25-key remote control and switching for 2 pair of loudspeakers. Audio inputs switch between and amplify up to 4 additional components, including 2 requiring both inputs and outputs (such as a cassette deck and a VCR). The built-in AM/FM tuner features 30 station presets and auto station setup.
Other features include bass and treble tone controls, a dimmable fluorescent display, and a .25-inch headphone jack for private listening.