Car subwoofer. Part 2

Encyclopedia of radio electronics and electrical engineering / Speakers

 Comments on the article

The first option had two drawbacks. Firstly, a certain object standing instead of the back seat attracted the attention of young people and middle-aged gays. Secondly, the SPL was clearly lower than possible, and the frequency response ignored the region above 60 Hz. As a solution, the public advised turning the bubukalo backwards and using the horn effect. On the advice of the public... no, I didn't buy a "Moskvich" car, but decided to make a new Anti-Stealth-style bubuku, keeping the VISIBILITY of the rear seat and the invisibility of the subwoofer itself.

The decision hovered in my head: The sub should be made as a dummy rear sofa - covered with the same cover as the front (real) seats, no pioneer would guess. The back of the sofa is just a rectangular volume 120 * 1370 * 520 mm, albeit with curly cutouts, which even with thick walls will give at least 35 liters. Since the depth of the Focal speaker (press it to the heart! I won’t change it, you won’t wait) is 160 mm, the head does not fit into the size of the back, and requires additional volume of the “muzzle”. This is how it should look in profile.

And here are the dimensions of the back and bottom of the box. The approximate volume is 30-35 liters in the back itself and 10-15 in the "growth". Total 40-50, as it turns out.

How much

Materials and budget (spring-2000, Moscow markets)

• Plywood 20-25 mm - 1 sheet 1.5 * 1.5 m - cut into sheets 520 * 1360 (front wall), 490 * 1360 (rear), 360 * 1000 mm (bottom). In the sheets we cut curly cutouts for the arches and cups of the pendant, adjust them in place. We use the rest to cut out the mounting flange for the speaker and the left "rafter" between the flange and the main volume. 250 rub. I’ll note right away that having some stock of 12 and 15 mm plywood, I made the side walls composite (15 + 12 = 27 mm, I don’t wave the castle).
• Board (dry, planed) 80 * 30 mm - 5 meters. From it we make wall-shells between the front and rear walls. In the inner walls - saw through windows 50 mm wide for air circulation. 100 rub.
• Glue in cartridges - waterproof liquid nails - 3 cartridges (150 rubles). We glue all wooden structures on it, then we attract with screws 50-65 mm (30 rubles).
• Fiberglass 0.20 (4m = 120 rubles), carbon tape (3m = 120 rubles), resin (400 rubles) - in my version, you need about 4 sq.dm. fiberglass wall. Using carbon fabric, the wall is not thick - it took me one liter can of Cargroom bourgeois polyester. Expensive, but it glues perfectly at T = 5C, with the consistency of jelly, it soaks easily and does not drain.
• Foam - about 1/3 bottle, 30 rubles.
• Carpet remnants, approximately 1 sq.m. - for pasting the inside of the box - 100 rubles. And glue for this - 50 rubles.

Total - 1300 rubles - less than 50B. Without finishing

Weekend project.

Here is the sequence of work - using a fast polyester resin, it’s really possible to do everything for a fine finish in less than two days off (for one, helpers, black children and drinking companions are welcome but not required) .. self-tapping screw.

Day 1

First, the front (without cutouts) wall is cut out and adjusted in place. Boards of 80 * 30 mm are sewn onto it around the perimeter and inside, using liquid nails (plentily) and self-tapping screws. In the internal partitions (in my case, one vertical, one horizontal), windows are pre-cut. Then, having installed with the help of a Negro, and preferably two, the “back” in place, we mark out the exact shapes of the bottom and back wall. Cut out.

There, right in the plane of the rear wall, at the bottom (Niva and on bubuki) - between the arches - there are two growths - suspension cups. The box simply bypasses the right cup, and the left one is actually included in the volume of the protrusion for the speaker. For her, a house of bars and plywood is being built on the bottom. Also, oblique bars are attached to the bottom along the leading edge, to which we then sew the front wall.

Then we paste over all the internal planes that do not touch each other and spacers with carpet. Ideal moment, slightly diluted with any solvent. Smear with a spatula. Or PVA, but it dries longer. And you can nail with small carnations. And you can not upholster at all, a matter of taste.

Temporarily we shake up what we have. We cut out the mounting ring for the speaker and find the optimal position - so that it is both beautiful and does not take up much space, and so that the magnet does not strike on the wall. We determine on the spot the contour and shape of the fiberglass transitions from the ring to the box and the bottom. We cut a hole in the back wall along the contour of a slightly narrower fiberglass mold.

If possible, we make walls, bars, etc., forming the transition from the "muzzle" to the box. In my case, the left wall of the "transition" by 2/3 is just a triangular scarf made of the same plywood. As we decided - we finally assemble the box with glue and screws, fix the muzzle (that is, the flange).

There is no need to explain to those who are intelligible that in the last lines the first stage of the dish "Podium in Yelyutinsky" was presented. Stage 2 - having removed the glue streaks, and having protected the insides with what is necessary (old jeans in a plastic bag are convenient) - the transition area is covered with foam. Preferably "wet kneading", so that the dried foam is dense and does not crumble. Stop, let it dry...

Day 2

Did you guess though? right, the second day begins with the removal of excess foam and gluing the shell. I warn you right away, polyester dissolves the foam, and in order to avoid its failure (literally and figuratively) - I rubbed the surface of the foam ... with hot plasticine. For everything about everything, it took a liter of resin in 4 batches. Before starting the next batch, be sure to clean up resin drips and burrs! I just ripped off, on Genn's advice, everything was grinder.

1. Primary 2 layers of fiberglass on plasticine. It won't work anymore, it starts to slip.

2. The main array of glass-glass-coal-coal-glass-coal-coal-glass is performed three times with one Stakhanov jerk. Since May turned out to be cold and the resin hardened no earlier than an hour, I made it on time, but in the sun it will most likely be necessary to break the operation into two steps. The output should be at least 7 mm of the wall without bubbles.

3. We paste over the outside in 3-4 layers of the bottom-back wall joint. After all, there is no bar there, everything will be held on this "corner" of fiberglass. Paste over the other seams around the perimeter (top). We glue the "fairing" for the right suspension cup on the foam blank.

4. Turn the object over and glue the remaining joints.

Publication: cxem.net

See other articles Section Speakers.

Read and write useful comments on this article.

<< Back

Latest news of science and technology, new electronics:

Artificial leather for touch emulation 15.04.2024

In a modern technology world where distance is becoming increasingly commonplace, maintaining connection and a sense of closeness is important. Recent developments in artificial skin by German scientists from Saarland University represent a new era in virtual interactions. German researchers from Saarland University have developed ultra-thin films that can transmit the sensation of touch over a distance. This cutting-edge technology provides new opportunities for virtual communication, especially for those who find themselves far from their loved ones. The ultra-thin films developed by the researchers, just 50 micrometers thick, can be integrated into textiles and worn like a second skin. These films act as sensors that recognize tactile signals from mom or dad, and as actuators that transmit these movements to the baby. Parents' touch to the fabric activates sensors that react to pressure and deform the ultra-thin film. This ... >>

Petgugu Global cat litter 15.04.2024

Taking care of pets can often be a challenge, especially when it comes to keeping your home clean. A new interesting solution from the Petgugu Global startup has been presented, which will make life easier for cat owners and help them keep their home perfectly clean and tidy. Startup Petgugu Global has unveiled a unique cat toilet that can automatically flush feces, keeping your home clean and fresh. This innovative device is equipped with various smart sensors that monitor your pet's toilet activity and activate to automatically clean after use. The device connects to the sewer system and ensures efficient waste removal without the need for intervention from the owner. Additionally, the toilet has a large flushable storage capacity, making it ideal for multi-cat households. The Petgugu cat litter bowl is designed for use with water-soluble litters and offers a range of additional ... >>

The attractiveness of caring men 14.04.2024

The stereotype that women prefer "bad boys" has long been widespread. However, recent research conducted by British scientists from Monash University offers a new perspective on this issue. They looked at how women responded to men's emotional responsibility and willingness to help others. The study's findings could change our understanding of what makes men attractive to women. A study conducted by scientists from Monash University leads to new findings about men's attractiveness to women. In the experiment, women were shown photographs of men with brief stories about their behavior in various situations, including their reaction to an encounter with a homeless person. Some of the men ignored the homeless man, while others helped him, such as buying him food. A study found that men who showed empathy and kindness were more attractive to women compared to men who showed empathy and kindness. ... >>

Random news from the Archive Smart bike pedal 12.05.2015 French start-up Connected Cycle today announced that a fundraising campaign for their Connected Cycle pedal project has been launched on the Indiegogo crowdfunding platform and raised the required $50,000 on the first day. "Smart Pedal" will turn every bike into a "smart bike". Powered by pedaling, the system gives the owner the ability to know where their bike is and, thanks to built-in GNSS sensors and network connections, acts as a fitness tracker, recording speed, route, incline and calories burned for each ride. All this data is stored in a synchronized application that allows you to track your activity level over time. This information is stored in the pedals themselves - so you don't need a smartphone to access it. However, the device is connected to the cloud and mobile applications. Connected Cycle also offers B2B fleet management systems for bike rental companies. Installing the device takes two minutes and does not require special skills. The pedal can only be removed using a special coded key, which will be available to the owner and no one else.

Other interesting news:

▪ MAX9701 - Class D Audio Power Amplifier

▪ Nicotine from e-cigarettes mutates DNA

▪ Miniature efficient acoustic amplifier

▪ Scientists have learned to compress water

▪ Windmill on the high seas

News feed of science and technology, new electronics

Interesting materials of the Free Technical Library:

▪ section of the website Audiotechnics. Article selection

▪ Infection prevention article. Basics of safe life

▪ article How big is the largest galaxy? Detailed answer

▪ article Climbing work using the methods of industrial mountaineering. Standard instruction on labor protection

▪ article Network power supply transceiver - do it yourself! Encyclopedia of radio electronics and electrical engineering

▪ article Dual-mode charger-discharge device. Encyclopedia of radio electronics and electrical engineering

Leave your comment on this article:

All languages ​​of this page

Arabic	Hebrew	Polish
Bengali	Hindi	Portuguese
Chinese	Italian	Spanish
English	Japanese	Turkish
French	Korean	Ukrainian
German	Malay	Vietnamese

Home page | Library | Articles | Website map | Site Reviews

www.diagram.com.ua
2000-2024