Modernization of the regular audio system of the car is a process that sooner or later faces almost every owner who wants to improve the quality of music in the cabin. Often enthusiasts buy expensive component systems of famous brands, but when trying to install them, they find that regular seats in door cards or shelves do not correspond to the dimensions of the new acoustics. This is where the help comes in. sling-ring, which become an indispensable element of the installation, allowing you to solve the problem of incompatibility of size and depth of landing.
Ignoring the need for transition elements can lead to serious problems, including damage to the diffuser speaker against the inner metal part of the door or the inability to close the skin due to a protruding magnet. Well-chosen lantern Not only does it provide reliable fixation of the speaker, but it also sets the necessary orientation of the sound wave, which is critical for building a high-quality scene. In this article we will discuss in detail all the nuances of the choice of materials, the calculation of geometry and the technology of installation of these elements.
It is important to understand that simply “pinning” a larger speaker in place of a regular “pancake” or a small speaker without preparation is a path to distortion and mechanical damage. Acoustic adapter performs the function of a bridge between the car body and new equipment, ensuring tightness and rigidity of the structure. Let’s take a look at what options are available in the market and how to make the right choice for your particular case.
Why do you need a box ring when installing acoustics?
The main function of the parcel ring is to coordinate the geometric parameters of the standard installation site and the dimensions of the new speaker. The regular openings in the doors of cars often have non-standard mounting diameters or shape other than round, whereas aftermarket acoustics are produced according to uniform standards, such as: ISO or DIN. Without the use of an adapter, it is physically impossible to install a high-quality speaker without violating the integrity of the metal of the door, which is undesirable for maintaining anticorrosion protection.
The second, no less important aspect is to ensure the necessary volume of the air chamber behind the speaker and protect the back of the magnetic system. Many powerful speakers have a deep magnet and a basket that walks at large amplitudes of oscillations. Proposition creates a safe distance between the moving elements of the speaker and the inner wall of the door or window. If you do not take into account this parameter, at maximum volume, the diffuser can rest on the metal, which will lead to its rupture or wedge of the sound coil.
⚠️ Before buying or manufacturing rings, be sure to measure the maximum stroke of the diffuser (Xmax) and the depth of the magnetic system. Leave a minimum of 5-7 mm margin to the nearest obstructing part inside the door to exclude mechanical contact during peak loads.
Also, the parser rings play a role in the formation of the correct acoustic design. A rigid ring, tightly attached to the metal of the door and speakers, minimizes the parasitic vibrations and resonances that can color the sound. If the speaker is “wandering” or fits loosely, some of the energy of the low frequencies is lost, and unpleasant sounds may appear at medium frequencies. Quality installation always involves the use of vibroisolating materials and sealing joints.
Manufacture materials: plywood, MDF, plastic or metal
The choice of material for the manufacture of the parser rings directly affects the durability of the structure and, to a lesser extent, the sound characteristics. The most popular and affordable option is waterproof. plywood. It has excellent rigidity, holds its shape well and, most importantly, when properly processed, is not afraid of moisture, which inevitably condenses in the car doors. For autoacoustics, plywood with a thickness of 15 to 25 mm is usually used, gluing several layers together to obtain the desired height.
An alternative to plywood is MDF (Medium Density Fibreboard) This material is more uniform in structure and easier to figure on machines, but it is much more afraid of moisture. If you choose MDF for doors, you need to ensure perfect waterproofing on all sides, including the ends, otherwise, after a couple of seasons, the ring can swell and lose its properties. In dry areas, such as the rear shelf of the sedan, MDF feels quite comfortable.
Plastic and metal spacers are often bundled with speakers or marketed as versatile solutions. Plastic is lightweight and completely inert to water, but can resonate at certain frequencies if the walls are too thin. Metal rings (aluminum or steel) provide maximum rigidity, but require mandatory vibration insulation, as the metal perfectly transmits vibrations to the body. Composite materials fiberglass and fiberglass are used less often due to the complexity of manufacture, but have unique damping properties.
☑️ Criteria for material selection
When choosing between materials, it is necessary to be guided by the operating conditions. For frontal acoustics in doors where the risk of moisture is maximum, plywood with impregnation or specialized automotive plastic will be the best choice. If you are building a high-end system, where every gram of weight and no resonances are important, you can consider options from multi-layered plywood with reinforcement or composites.
Size calculation and geometry of adapters
The geometry of a parcel ring is not just a “hole in the board.” For high-quality sound and reliable installation, many parameters must be considered. The key size is the outer diameter, which must correspond to the regular seat in the door, and the inner diameter, which ensures free passage of the magnet and the speaker basket. An error in the calculations even by a few millimeters can lead to the fact that the speaker will not stand in place or will touch the moving parts on the edge of the hole.
Particular attention should be paid to the height (thickness) of the ring. It is calculated as the sum of the depth of the magnetic system of the speaker, the stroke of the diffuser in both directions (peak-to-peak) and the safety margin. If the speaker has an asymmetric basket or the magnet is offset, the ring may not need to be symmetrical, but with a shifted center. In such cases, they are used eccentric or rings of complex shape, repeating the contours of the inner cavity of the door.
Accurate calculation often requires the creation of a template or the use of 3D modeling, especially if the space inside the door is limited by window lift mechanisms. Below is a table with indicative data for popular sizes of speakers, which will help to form a primary view of the required dimensions.
| Dynamic size | Attachment diameter (mm) | Depth of landing (mm) | Recommended ring thickness |
|---|---|---|---|
| 10 cm (4 inches) | 95-105 | 40-50 | 15-20 mm |
| 13 cm (5.25 in) | 130-140 | 50-65 | 20-25 mm |
| 16 cm (6.5 in) | 160-165 | 60-80 | 25-35 mm |
| 17 cm (6x9 in) | 165x230 | 70-90 | 30-40 mm |
It is also important to consider the angle of inclination of the speaker. In the doors of cars it is often impossible to install the speaker strictly perpendicular to the ground due to the design of the door map. In such cases, the sling ring is made with a tilt or use podiums integrated into the door map to direct the sound towards the listener. This improves the scene and the detail of the sound.
Technology of manufacturing paddles with their own hands
Making the rings yourself is a great way to save money and get a product that is ideal for your tasks. The process begins with the removal of the door map and the removal of the old speaker. It is necessary to carefully clean the seat of dirt, rust and remnants of the old sealant. Then exact measurements are taken: the diameter of the hole, the location of the fastening bolts, the distance to internal obstacles.
To create a ring of plywood will require an electrolobzig, drill, screwdriver and carpentry glue. Two or three circles are cut (depending on the thickness required), holes are drilled into them under the fastener. The layers are glued together in a tow or a joint, providing a monolithic structure. After drying the glue, the outer diameter is given a shape corresponding to the relief of the door, and the inner one is given a shape that envelopes the magnetic system.
Sequence of action:1. Measure and create a paper template.
2. Transfer of contours to plywood.
3. Cutting blanks with a tolerance of 2-3 mm.
4. Slicing layers and pressing.
5. Final processing of the form and grinding.
Finishing involves impregnation of the material with moisture-protective compounds. For plywood and MDF, nitrolacs, epoxy resins or special automotive mastics are excellent. The coating should be applied in several layers with complete drying of each to prevent moisture from entering the porous structure of the tree.
Proper installation and sealing
Installation of ready-made parse rings requires accuracy and compliance with technology. The first step is always fitting: the ring is set in place without a speaker, the free passage of the window lifter in all positions is checked. If the glass touches the ring, it is necessary to reduce its height or change the shape of the inner cutout. Only when you are convinced of the absence of mechanical conflicts, you can start fixing.
Mounting the ring to the metal of the door is carried out on bolts or screws. Between the metal and wood (or other ring material) is strongly recommended to lay a layer of vibration insulation. This will reduce the transmission of vibrations from the speaker to the body and prevent the appearance of rattling. For fixation, regular holes are often used, but in some cases, you have to drill new ones, which requires mandatory anticorrosion treatment of the edges of the hole.
⚠️ Note: When drilling new holes in doors, use a depth limiter drill so as not to accidentally damage the wires running inside the door or the window lift mechanism. Always check the interior space through the process holes before drilling.
The final stage is sealing. The joint between the parsley ring and the metal of the door, as well as between the ring and the speaker basket, must be smeared with a sealant (for example, on a silicone or polyurethane basis). This turns the door into a closed volume (acoustic cavity), which greatly improves the return of low frequencies. Without sealing, the bass will “go” through the door and the sound will become flat.
Common Mistakes and How to Avoid Them
One of the most common mistakes is to use too thin material for the stretch. Enthusiasts often try to save space by using 10-12mm thick plywood for powerful speakers. As a result, at high volume, the ring begins to resonate with the bass, emitting an unpleasant buzzing sound that spoils the whole sound picture. The thickness should be sufficient for rigidity and safety.
Another common problem is the neglect of protection from moisture. Even if you use moisture-resistant plywood, unprotected ends and fasteners remain vulnerable. After a year or two of operation in the Russian climate, such a ring can be layered or covered with mold. High-quality varnishing or the use of epoxy resin is mandatory for any wooden components in the doors.
There is also a frequent mispositioning error. The speaker can be set so that its dome (tweet in coaxial or mid-in component) is too deep in the doorway or, conversely, too close to the skin. This leads to the fact that when installing a door card, plastic presses on the diffuser, limiting its movement, or creates a gap through which the sound leaves. Always check the gap between the speaker and the skin.
Can I use regular plastic spacers for powerful speakers?
The regular plastic spacers are designed for light factory speakers with a small magnet. Installing heavy component acoustics with a neodymium magnet can lead to breakage of plastic from vibration or weight, especially if the mounting is carried out only for regular ears. It is better to replace them with reinforced analogues made of metal or multi-layer plywood.
Do I need to cut metal from the door under the supply ring?
In most cases, cutting metal ("Bulgar" or scissors) is not required and even harmful, as it violates the rigidity of the door and corrosion protection. The stacking ring shall be mounted on existing openings or on welded/sticked areas. Metal cutting is justified only in exceptional cases when building professional systems, when the regular space is categorically insufficient.
What if the speaker still does not fit in the depth?
If even a thick parsley ring doesn't help, and the magnet rests on the window, there are two ways. The first is the use of speakers with neodymium magnets, which have a lower depth at the same power. The second is the manufacture of a podium that takes the speaker outward, towards the cabin, which requires the revision of the door map.
Does the material of the ring affect the sound?
Yes, it does, but not as much as the quality of the installation and sealing. The tree has good damping properties and does not ring. Metal can produce resonances if not vibroisolated. Plastic can be "buzzing." However, the difference between high-quality plywood and high-quality MDF on hearing in a moving car will be minimal compared to the difference between sealed and “leaky” installation.
Do I need to make a poster for rear acoustics?
For rear acoustics, requirements are often lower, as it plays a supporting role. However, if you put in the rear full 16-cm speakers instead of regular oval or small, the drawers will need similar frontal. If the rear works simply for the “background”, you can use simpler solutions, but sealing is still desirable to improve the bass.