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![]() To purchase 700M spares or accessories, please contact the company via their website or visit an authorised retailer. For one amplifier to produce sound twice as loud as another in decibels, you need 10 times more wattage output. Robert Silva has written about audio, video, and home theater topics since 1998. Kenwood Home Stereo Power Amplifier Series Home TheaterRobert has written for Dishinfo.com, and made appearances on the YouTube series Home Theater Geeks. What always stands out in online and newspaper Ads for amplifiers, stereo, and home theater receivers, is the watts-per-channel (WPC) rating. One receiver has 50 Watts-Per-Channel (WPC), another has 75, and yet another has 100. An amplifier with 100 WPC is twice as loud as 50 WPC, right Not exactly. When it comes to real amplifier power output, especially with surround sound receivers, you cant take a manufacturers amplifier power rating statements at face value. You need to look closer at what they are basing their statements on. For example, for home theater receivers that have a 5.1 or 7.1 channel configuration, is the stated wattage output specification determined when the amplifier is driving just one or two channels at a time or is the specification determined when all channels are driven simultaneously. In addition, was the measurement made using a 1 kHz test tone, or with 20Hz to 20KHz test tones. When you see an amplifier wattage rating of 100 watts-per-channel at 1 kHz (which is considered the standard mid-frequency reference) with one channel driven, the real-world wattage output when all 5 or 7 channels are operating at the same time across all frequencies will be lower, possibly as much as 30 or 40 lower. Its better to base the measurement with two channels driven, and, instead of using a 1kHz tone, use 20Hz to 20kHz tones, which represents the widest frequency range that a human may hear. However, that still doesnt take into account the amplifiers power output capability when all channels are driven. In a home theater receiver, not all channels require the same power at the same time. For example, a movie soundtrack will have sections where only the front channels may be required to output significant power, while the surround channels may output less power for ambient sounds. Based on those conditions, a power specification rating phrased in context is more practical to real-world conditions. One example would be 80 watts-per-channel, measured from 20Hz to 20kHz, 2-channels driven, 8 ohms,.09 THD. What all the above techie terms mean is that the amplifier, stereo, or home theater receiver has the ability to output 80-WPC using test tones over the entire range of human hearing, when two channels are operating with standard 8-ohm speakers. Also included in our example is the notation that the resulting distortion (referred to a THD or total harmonic distortion) is only.09. This represents a very clean sound output (more on THD later in this article). Kenwood Home Stereo Power Amplifier Full Power ContinuouslyAnother factor to consider is whether a receiver or amplifier can output its full power continuously. Just because a receiveramplifier may be listed as being able to output 100 WPC, doesnt mean it can do so for any significant length of time. When checking amplifier specifications, see if the WPC output is measured in RMS or FTC terms, and not terms such as Peak or Maximum Power. Our ears detect differences in volume level in a non-linear fashion. A difference of approximately 1 dB is the minimum perceptible change in volume, 3 dB is a moderate change in volume, and about 10 dB is an approximate perceived doubling of volume.
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