E-TDA2030AV Ver la hoja de datos (PDF) - STMicroelectronics
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E-TDA2030AV Datasheet PDF : 23 Pages
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Multiway speaker systems and active boxes
TDA2030A
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 or three bands.
To maintain a flat frequency response over the hi-fi audio range, the bands covered by each
loudspeaker must overlap slightly. 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 to determine the cutoff
frequencies of the crossover filters (see Figure 21). 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.
ct(s Figure 21. Power distribution vs. frequency
solete Product(s) - Obsolete Produ Both active and passive filters can be used for crossovers, but today active filters cost
b significantly less than a good passive filter using air cored inductors and non-electrolytic
O capacitors. In addition, active filters do not suffer from the typical defects of passive filters:
● power less
● 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.
10/23
Doc ID 1459 Rev 2
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