This is crossover of vifa P17W00 and use D27TG45 which very flat response. Do It youself.
6/07/2008
Simple Crossover Example
This is crossover of vifa P17W00 and use D27TG45 which very flat response. Do It youself.
6/05/2008
Calculate Baffle Diffraction Loss
Calculate Baffle Diffraction Loss. A full range speaker finds itself radiating into half space at the upper frequencies but radiating into full space at lower frequencies.As a result, there is a gradual shift of -6dB from the highs to the lows.
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Calculate Baffle Diffraction Loss
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Calculate Baffle Diffraction Loss
Loudspeaker History
Loudspeaker History
1874: Ernst W. Siemens applies for a U.S. patent for what he describes as a “dynamic,” or moving-coil, transducer. Siemens takes a circular coil of wire and supports it so it moves axially in a magnetic field. His patent is applied for as a “magneto-electric apparatus.” Oddly, his design isn’t used for anything audible. 1876: Alexander Graham Bell patents the telephone. Siemens works on a nonmagnetic parchment diaphragm to act as the audible radiator for his moving-coil transducer and patents his technology one year later.
It’s mostly used in phonograph players in the acoustic era. His cone is attached to flaring “morning glory”-shaped horns. 1911: Edwin S. Pridham and Peter L. Jensen invent the Magnavox -- the world’s first PA system. Wilson uses this moving-coil loudspeaker in a time when most speakers are cone designs and their frequency range is limited.
1931: Bell Labs develops the first fidelity speaker. This two-way loudspeaker (called “divided range”) uses a small horn to produce frequencies in the range of 3K to 13K hertz. The 12-inch dynamic cone radiator offers a frequency range from 5K to 10K hertz. 1932: RCA releases its own dual-range speaker for theaters. It incorporates three 6-inch cone diaphragms with aluminum voice coils aimed in multiple directions for a frequency response of 125 to 8K hertz, and 10-foot-long horns capable of reproducing 40 to 125 hertz. Hence, the era of the multi-cell horn commences. Thuras theater speaker 1933 1945: Altec Lansing Corp. puts its two-way “Voice of the Theater” speaker system on the market. It offers improved horns and magnetic drivers.
1974: Universal Pictures releases Sensurround sound for its new picture, Earthquake. It enhances low-frequency enough that during the film, the whole theaters rumble with the earthquake and aftershocks.
This is done with four large, low-frequency horns installed behind each screen. Individual horns measure 8 feet long, 4 feet wide and four feet tall. One-thousand-watt amplifiers in the back corners of the theaters power two additional horns. 1982: George Lucas and his THX sound system shoot moviegoers into a new galaxy of sound with the release of Return of the Jedi. Here, a combination of speakers, crossover networks and a high standard of audio equipment and performance standards set the next level of quality.
1874: Ernst W. Siemens applies for a U.S. patent for what he describes as a “dynamic,” or moving-coil, transducer. Siemens takes a circular coil of wire and supports it so it moves axially in a magnetic field. His patent is applied for as a “magneto-electric apparatus.” Oddly, his design isn’t used for anything audible. 1876: Alexander Graham Bell patents the telephone. Siemens works on a nonmagnetic parchment diaphragm to act as the audible radiator for his moving-coil transducer and patents his technology one year later.
It’s mostly used in phonograph players in the acoustic era. His cone is attached to flaring “morning glory”-shaped horns. 1911: Edwin S. Pridham and Peter L. Jensen invent the Magnavox -- the world’s first PA system. Wilson uses this moving-coil loudspeaker in a time when most speakers are cone designs and their frequency range is limited.
1931: Bell Labs develops the first fidelity speaker. This two-way loudspeaker (called “divided range”) uses a small horn to produce frequencies in the range of 3K to 13K hertz. The 12-inch dynamic cone radiator offers a frequency range from 5K to 10K hertz. 1932: RCA releases its own dual-range speaker for theaters. It incorporates three 6-inch cone diaphragms with aluminum voice coils aimed in multiple directions for a frequency response of 125 to 8K hertz, and 10-foot-long horns capable of reproducing 40 to 125 hertz. Hence, the era of the multi-cell horn commences. Thuras theater speaker 1933 1945: Altec Lansing Corp. puts its two-way “Voice of the Theater” speaker system on the market. It offers improved horns and magnetic drivers.
1974: Universal Pictures releases Sensurround sound for its new picture, Earthquake. It enhances low-frequency enough that during the film, the whole theaters rumble with the earthquake and aftershocks.
This is done with four large, low-frequency horns installed behind each screen. Individual horns measure 8 feet long, 4 feet wide and four feet tall. One-thousand-watt amplifiers in the back corners of the theaters power two additional horns. 1982: George Lucas and his THX sound system shoot moviegoers into a new galaxy of sound with the release of Return of the Jedi. Here, a combination of speakers, crossover networks and a high standard of audio equipment and performance standards set the next level of quality.
Speaker DIY Shop on Thailand
http://advancerich.tarad.com
This web site is Korat on thailand which have many brand speaker and DIY speaker, Tube amp...etc for sell and
This web site is Korat on thailand which have many brand speaker and DIY speaker, Tube amp...etc for sell and
5/03/2008
TL Speaker
Lamda/4 = L of pipe for tranmission line speaker such as you have spec speaker at 56Hz. you can calculate L of pipe at
Lamda = V/F => V is velocity of sound in the air ( 3*10^4 m/s)
=> F is frequency
So that Lamda = 30000/56 =...................
L = Lamda/4 =................ m
You can get pipe your speaker...
Lamda = V/F => V is velocity of sound in the air ( 3*10^4 m/s)
=> F is frequency
So that Lamda = 30000/56 =...................
L = Lamda/4 =................ m
You can get pipe your speaker...
4/26/2008
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