DESIGN AND CONSTRUCTION OF A SUB FREQUENCY AMPLIFICATION LOUDSPEAKER SYSTEM CAPABLE OF AMPLIFYING FREQUENCIES BETWEEN 45HZ THROUGH 125HZ AND A COUPLED CLASS AB 2KW POWER AMPLIFICATION SYSTEM
Faculty
Year of Publication
upload
Publication Type
Abstract
The primary pursuit of this project was to determine the response of a manufactured sub frequency amplification loudspeaker system capable of amplifying frequencies between 45 Hz through 125 Hz. Secondly, a 2000 W class AB power amplifier was also designed and manufactured to specifically power this loudspeaker design. Finally, using transfer function measurements, the critical identification and analysis of the character of the output wave forms in diverse listening spaces was done. This project was carried out using a low frequency transducer/driver of size 18 inches, made of Neodymium permanent magnet, a copper voice coil of 4-inches, and a diaphragm made of sturdy paper film. This driver/transducer is tightly suspended within a casket which comprises of a robust acoustic (wooden) compartment made of birch plywood of thickness 4 millimeters(4mm), with an internal rigid structure, critically designed in a bandpass configuration for maximum acoustic power output within which the transducer is
immersed/suspended and made to resonate. The CLASS AB power amplification system was specifically manufactured using bipolar junction transistors, give a maximum output power of 2000 W. This was chosen since an efficiency of about 75% can be gotten. In order for the frequency/amplitude response to be got, we used several third-party measurement softwares to determine and analyze various response traces using sweeps and test signals in various listening spaces. The third party software include: RATIONAL ACOUSTICS SMAART V8, ROOM EQ WIZARD(REW), DECIBEL-X. And finally, for the determination of the dispersion(horizontal and vertical) characteristics, the acoustic behavior of our wave fronts and the simulation of our response respectively was predicted using: EASE FOCUS 3 and MEYER SOUND SIM
immersed/suspended and made to resonate. The CLASS AB power amplification system was specifically manufactured using bipolar junction transistors, give a maximum output power of 2000 W. This was chosen since an efficiency of about 75% can be gotten. In order for the frequency/amplitude response to be got, we used several third-party measurement softwares to determine and analyze various response traces using sweeps and test signals in various listening spaces. The third party software include: RATIONAL ACOUSTICS SMAART V8, ROOM EQ WIZARD(REW), DECIBEL-X. And finally, for the determination of the dispersion(horizontal and vertical) characteristics, the acoustic behavior of our wave fronts and the simulation of our response respectively was predicted using: EASE FOCUS 3 and MEYER SOUND SIM
Supervisor(s)
co-supervisor