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TDA2040 датащи(PDF) 11 Page - STMicroelectronics |
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TDA2040 датащи(HTML) 11 Page - STMicroelectronics |
11 / 16 page TDA2040 Applications Doc ID 1460 Rev 6 11/16 3.2 Multiway speaker systems and active boxes Multiway loudspeaker systems provide the best possible acoustic performance since each loudspeaker is specially designed and optimized to handle a limited range of frequencies. Commonly, these loudspeaker systems divide the audio spectrum into two, three or four bands. To maintain a flat frequency response over the hi-fi audio range the bands covered by each loudspeaker must overlap slightly. Any imbalance between the loudspeakers produces unacceptable results, therefore, it is important to ensure that each unit generates the correct amount of acoustic energy for its segment of the audio spectrum. In this respect it is also important to know the energy distribution of the music spectrum (see Figure 22) in order to determine the cutoff frequencies of the crossover filters. As an example, a 100-W three-way system with crossover frequencies of 400 Hz and 3 kHz would require 50 W for the woofer, 35 W for the midrange unit and 15 W for the tweeter. Both active and passive filters can be used for crossovers but today active filters cost significantly less than a good passive filter using air-cored inductors and non-electrolytic capacitors. In addition, active filters do not suffer from the typical defects of passive filters: ● power loss ● increased impedance seen by the loudspeaker (lower damping) ● difficulty of precise design due to variable loudspeaker impedance Obviously, active crossovers can only be used if a power amplifier is provided for each drive unit. This makes it particularly interesting and economically sound to use monolithic power amplifiers. In some applications, complex filters are not really necessary and simple RC low-pass and high-pass networks (6 dB/octave) can be recommended. The results obtained are excellent because this is the best type of audio filter and the only one free from phase and transient distortion. The rather poor out-of-band attenuation of single RC filters means that the loudspeaker must operate linearly well beyond the crossover frequency to avoid distortion. Figure 21. Frequency response Figure 22. Power distribution vs. frequency Obsolete Product(s) - Obsolete Product(s) |
Аналогичный номер детали - TDA2040 |
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Аналогичное описание - TDA2040 |
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