Audio Video Receiver and Amplifiers
Power is Everything...
Selecting the right Audio Video Receiver or Amplifier is always a challenge. You have to make the right decision for your needs today, but at the same time consider your future power requirements. Obviously your budget is a key factor in the receiver selection process and in this world Power Output = Cost.
The Receiver, be it a Dolby Digital/dts 5.1-channel surround-sound A/V model or a simple 2-channel stereo unit serves as the control unit and the amplification center for your entire system (by the way, it’s a “receiver” because it contains a built-in AM/FM radio tuner). If a receiver lacks an AM/FM tuner, it would be an “Integrated amplifier,” or just plain “amp,” for short. This is the most important component in your home theater, next to your speakers and TV.
The Receiver (and its remote control if so equipped) let you select which source to listen to or watch (CD player, FM tuner, tape deck, VCR, or DVD player).
When you press “CD” on the control panel or remote, the Receiver internally switches its amplifiers to the incoming signal from your CD player, passes those signals through its control section (tone, balance and volume controls), then to its built-in amplifiers and sends the greatly strengthened audio signals to your speakers (and the accompanying video signal to your TV, if you selected “DVD” or “VCR”).
You must consider whether to get a simple stereo receiver that has two internal amplifiers to drive a pair of speakers, or instead, an A/V surround-sound unit that will have a minimum of five internal amplifiers to drive five speakers.
In a Home Theater system there are normally the left and right main speakers up front, a center-channel speaker atop your TV, and two surround speakers on the side walls. The sixth or “.1” channel, as in “5.1,” is just for deep bass and low-frequency soundtrack effects.
That Low-Frequency Effects (LFE) “.1” channel is sent to your subwoofer, which almost always has its own internal amplifier. Surround-sound A/V receivers also have internal digital decoders to sort out the DVD player’s Dolby Digital or dts digital 5.1-channel soundtrack.
By comparison, stereo receivers are blessedly simple - just two internal amplifiers, no surround sound circuitry, and two pairs of speaker output connectors for the left and right channels. This simple stereo receiver still appeals to lots of buyers, however, prices of surround-sound 5.1-channel A/V receivers have become so competitive that they cost little more than a basic 2-channel stereo model. So consider your choice carefully, because while you may not want a Home Theater right now, you might want one in the future – and why pay twice if you don’t have to.
Remember that I said, Power Output = Price, well, here’s the scoop --- The rated power output of the receiver’s internal amplifiers, stated in watts per channel into 8 ohms, will ultimately determine the unit’s selling price. The more power you buy, the more costly the receiver.
BUT “solid-state” (transistor) amplifiers are very economical. With units that are based on this technology you can find stereo receivers with 80 or 100 watts per channel for as little as $300. A/V surround receivers with similar power start at the $300 mark as well.
Whatever you do – DO NOT go cheap on the power - The greatest source of damage to speakers is using too small amplifiers to drive speakers at high volumes, especially when you might “crank it up” at a party. The amp runs out of watts, distorts, and the distorted signal burns out tweeters or woofers in seconds.
And one basic truth most consumers do not understand when they are shopping for amps and speakers: smaller speakers generally require more power—not less—to produce realistic volume levels than big speakers do because they use smaller woofers and are less efficient.
In all but very large living rooms or those with cathedral ceilings and volumes of 6,000 to 7,500 cubic feet, receivers with 80 to 100 watts output per channel to all five channels will be sufficient.
Those modest little 35-watt amplifiers may be okay for a den or a dorm but they just can’t cut it in an average living room unless you’re going to listen at background levels.
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