Author: Dong word
This speaker elements required: a pair of silver-silver flute YD131-727X woofer and tweeter flute YDQG4-2 couple.
Production process is as follows: (1) we must first determine the production closed or vented speaker. Vented Although bass was deeper dive, but closed like a bass clarity of better, therefore decided to consider making a closed speaker. (2) to determine the volume of the speakers. Using the formula: V = 355a ^ 4 / (α * fo ^ 2 * mo)
V: Effective speaker volume (L); a = effective vibration radius of the speaker (cm); α = stiffness ratio; mo = equivalent mass of vibration system subwoofer (g); fo = resonance frequency of the low frequency speaker. There are two methods when the times demand volume specific application of the formula. One method is to determine QoC; the other is to determine the FOC (lowest resonant frequency of a closed speaker).
The calculation results obtained from the two methods of view: two methods are calculated volume of about 6.5 liters, and the manufacturer's recommended values but also the same. Such a coincidence indicates that the minimum resonance frequency of the closed speaker is 90 Hz is a very suitable value. It was decided that the speaker volume is 6.5 liters. (3) determining the ratio of the shape of the speaker. In order to prevent the generation of a standing wave, length, width, thickness ratio must not be to scale. Also consider whether the speaker into the box and shape whether coordinated appearance. After the above consideration, the final selection of length, width, thickness ratio of 1.6: 1.0: 1.1. Then each speaker is calculated by the following equation edge length:
Be
(4) design divider. From the reproduction range of view two speakers, subwoofer up to 15K, the tweeter. 3K low, thus the crossover frequency is selected to be about 5K. If you compare the above table and the table will find two speakers with sensitivity to 88dB, but the nominal impedance of the woofer 6Ω, while the tweeter nominal impedance of 8Ω. Such subwoofer output sound pressure level will be higher, just make it right this low efficiency woofer features, but also eliminates the treble attenuation network. Below a circuit diagram of FIG. High cut-off point Di subwoofer by 6dB / oct design, low cut-off point of the tweeter by 12dB / oct design. Inductance and capacitance values are not taken by the calculated value, but the value of empirically, but this offset value is very small, no problem in practical use.
Power (W)
Frequency range (Hz)
Sensitivity (dB)
Equivalent quality (g)
Q value
Effective vibration radius (cm)
Equivalent volume (L)
Remark
50
65-15k
88
6.6
0.5
4.8
6.5
Long stroke, magnetically shielded, 6Ω
Be
Power (W)
Frequency range (Hz)
Sensitivity (dB)
Remark
20
3k ~ 20k
88
φ80 circular dome 8Ω
(5) the housing assembly. Since the pair of compact speakers, it is possible to use solid wood plate, with reference to the view of cutting.
Want to cut a good plate with adhesive during assembly connected into one, and then have to put all joint tightened with wood screws. After the glue is dry go down the inside walls of pouring a layer of asphalt. Asphalt after coagulation 5 cm thick layer of adhesive may be acrylic cotton as a sound absorbing material. Finally you can put into the speaker cabinet and a divider. In this way it assembled a cabinet. (6) housing decoration. After the assembled box Calibrating woodworking putty, sandpaper and then polished smooth the entire casing of the paint can. Use "since the painting" spray three times. Also make a pair of speaker protection network, available mesh stockings stretched over a wooden frame. So far this production to become speaker of the big announcement. See pictures next step is the audition. First off "Audio Test CD" audition subjective feeling of 90Hz ~ 18kHz substantially flat. The actual listening, too, but the dynamic a bit lacking, but used to listen to pop music, light music is still very good, use it to listen to Kui large dynamic symphony there is a little powerless. The tube amplifier is (6N2 + 6P14), and the pair of small speakers to match up perfectly, listening to country music and saxophone music, it's really good sound quality is impeccable.
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