Homemade overweight bass active speaker ----- Active Speaker

Keywords: homemade overweight bass active speaker Homemade super bass active speaker Zhu Guangyi "Electronic News" 1999 3 Ultra-low as the foundation of music signals, greatly affects the sense of listening, and the sense of death. Lack of ultra-low sound signals will make the music fabric is light and not true. However, the low frequency lower limit of the 6.5-inch or 8-inch low tone unit speaker currently used by the enthusiast can only reach 45-60 Hz (-3dB). Some friends are self-sensitive, but the vast majority is only low, and ultra-low extension is actually very poor. If an overweight bass active speaker is added to its speaker system, it may neither change the original system, and it can also greatly improve the ultra-low sound dive, and the low frequency lower limit can extend to 25-30 hours ~ (-3dB) to make the playback The music information is rich and complete, so that the ears and the skin enjoy greater shock. Figure 1 is a full circuit diagram, Figure 2 is a self-made speaker size configuration diagram, Figure 3 is an overweight bass active speaker circuit assembly. The overweight bass active speaker lower limit frequency is 25 Hz, and the upper frequency adjustment range is 80-200 Hz, which can make it to best in the best state with the main speaker of different frequency respiration. The inverted switching effect is to match the ultra-low tone unit paper pot with the main speaker bass unit paper pot movement. The most distinctive circuit is the Linkewitz compensator, which extends the natural frequency of the cabinet to approximately one times, and can control the total quality factor of the system. Power amplification with European ST company DMOS high power set successfully TDA7294, maximum output power up to 100W. The amplifying circuit should not use a normal voltage negative feedback circuit because the speaker can reach 20-30 Ω on a very low resonant frequency, which will reduce the output power in the vicinity of the frequency string. The current negative feedback can maintain the output power from being constant by the change of the speaker impedance. Using precision op amp 249 to do DC servo, its bass effect is greatly improved than ordinary amplifier circuits. Yang acounter uses Yinti YD310-43 or Nan Whale YD315-8XA, the closed box box can be used with a thickness of 18 mm, the internal net capacity is 50 liters, filling 300 grams of formation cotton, after compensation, the total buccal limit is 25 Hz ( -3dB), QT is 0.7. The overweight bass active speaker assembly is directly fixed to the lower part of the speaker, which is beautiful and easy to operate. figure 2 image 3

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