Keywords: speaker production process
Speakers are the most important units in the entire sound system, but also a link in the process of enthusiasts in the process of handling. In the case of a medium or particle speaker, you must control the vibration of a good box, you must thicken the sheet, and the production process requires high, and then it is the late decoration. It is often a failure in these processes. If you use natural stone or concrete, it is limited to the tool, but also requests professional processing, thereby lacking the fun in DIY.
I choose to make a more popular artificial stone in the home improvement materials to make a cabinet, and its main components are detritions, mineral particles, and stone powder, which have the following advantages compared to other materials:
1. Its sheet is factory production, uniform texture, large density, better sealing.
2. Easy to process, saws, drills, tapping, bonding, etc. are easy.
3. Leave the late decoration, only the wax is completed, the appearance is beautiful.
Design requirements
According to the existing speakers, amplifiers and 40 square meters to listen to the easy-to-push, small power can launch natural real sounds and wide and grand sound fields; the restoration is better, hopes that the sound is warm, although it is a monitored type but Can not be single like a small monitoring speaker.
Speaker unit and box
I chose Hui Wei's popular SSI + T8 unit combination, SSI impedance 5Ω, maximum power 45W, sensitivity 92dB, and the diaphragm are natural fiber woven. T8 impedance 7Ω, maximum power 150W, sensitivity 91dB, the basin is carbon fiber, Q value 0.37, manufacturer recommended dividend point ≤4.5 kHz. This combination can match well, especially suitable for families listening to the environment.
The box is referred to Huiwei "PS8 / A-Hong" bookshelf type. The treble unit is changed to the side, and the horizontal direction of the acoustic reflection formed by the front panel can be further suppressed. The reinforcing ribs and thick plates are to further reduce the oscillation of the cabinet. For less detours, the outer size and volume of the box is as small as possible to learn from the "PSS / A-Hong" size, see the figure below.
Divider
The divider cannot be sloppy. It cannot be calculated by the theory, but should be determined by repeated audition. Listening to the time divider, in the case of the box, the audition is adjusted after more than a month time, and the destruction is adjusted multiple times and is fixed on the bottom plate in the box. Capacitor 4.2μF is New Delk Red MAP, and the rest is a polypropylene capacitor. The inductance L1 is φ20mm × 23 mm, with a φ1.5mm copper wire around 90 laps, L2 is φ20mm × 23 mm, with φ1.2mm copper wire around 80 turns, is a hollow coil. The winding requirements are flat, and the specific circuit is shown in the figure, the copper plate is thick material. Due to the simple wiring, the blade method can be used, and the components are applied. Printed boards (see below) have parallel positions for capacitive parallel positions for debugging. It is worth mentioning that 4.2μF is parallel from 2 μF + 2.2μF, and other capacitors should also be connected in parallel. Actual proves, there are many more than a single large capacitance than a single large capacitor.
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Cabinet production
The artificial stone is generally thick to 13mm, and the size is accurately used in the picture below. If artificial stone needs to order to the cabinet seller, its color can be prevised. The source of material can also be installed with the cabinet, and the angle digging under the stove is not easy to unity. In summary, the plate is required to be straight, and the edge and the required parallel angle can be bonded after the calorie calibrate. The adhesive uses a special gel of artificial stone, and the same glue is the same as the plate. It is also possible to use their orate adhesive, but it is preferable to quickly adhesive, so it can be removed from fixed clamp. Since it is a fast adhesive, a small binder is poured, dripping a small drip curing agent, stir evenly, and how much is used. When bonding, the upper and lower left and so on, together, and the right angle of the right angle is four corners, and can be cured for 10 minutes. The front panel can be bonded at this time, and others are not busy. After curing for 4 hours to 5 hours, the face can be started.
The open device is made in a picture below, and the milling cutter selects a three-blade blade of φ4mm ~ 6mm, and can be opened with the hand drill.
Put the cured bonded casing on the ground, and the panel size is drawn on the drawing board. Tap the speaker and the center of the inverted hole, insert the bolted pin, and adjust the size, lock the bolt. The treble hole is to mill the outer diameter of φ105mm, deep 5mm mounting table, re-dig φ78mm through hole, and the bass hole is φ210mm, and the reverse hole has an inverted tube outer diameter milling. Note that the child is not drilled first, and the loose hole is to be drilled together with the net cover. After digging a hole one by one, the next step is equipped with a thick plate. Draw φ210mm and φ180RAM on the thick plate symmetry axis, the center is hit φLOMM hole, and φ180 mm large holes are digging. If the operation is good, the holes open are very standardized, and the abrasive can be polished. The thick plate is bonded to Fig. 1, and the panel is aligned according to the arc line of φ210mm, and the error is reduced as much as possible.
Next, the reinforcing rib is sticky on the left and right side plate, and finally, the rear backplane can be bonded, the junction box size can be determined according to the existing variety. The box has been basically formed, and the speaker and the junction box are made next. Place the speaker on the installation table, draw a hole in the hole, after drilling the φ3.5mm hole, take a mounting speaker with the hex self-tapping screw, open the screw toward the screw hole with the small branch knife, and make one Only automatic taps, the holes drilled into a ribbon, which is easy to install.
The cabinet sand is placed on the corner grinder with the Chiba sand. Since artificial stone is easy to polish, the contour of the box can be grinded into a small fillet. Then use 800 # water-proof sandpaper to add water to it, until it is bright. After cleaning, play the wax for car, which is beautiful and anti-fouling.
The tank sound absorbing material I cut into a 30mm thick piece of blowing agent in a waste refrigerator, and the mutually supported in the box, forming a sound barrier shape, brushing the latex, and the effect is quite good.
The rubber mud is rubbed into a chopsticks, and the circle is installed on the speaker, and the speaker is attached to the speaker, and the screw is tightened. The inverted pipe is first loaded, and it is finally applied to the length of the binder to modify it in the box and finally matches its own net cover. By comparing with the same combination, the sensitivity of human stone box is slightly higher, more easy to perform detail, easy to promote. Due to limited conditions, the physical indicators of this box cannot be measured, which can only be sensible. But in terms of family listening environment, it is indeed a value.
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