Slot box with recessed front wall for Ural Patriot 8 subwoofer with 39 Hz port setting
Content
So we got to the little villain. The box for the Ural Patriot 8 has a number of features. To begin with, let's start with the cons, which, fortunately, are not so many. No matter how hard we tried, we failed to make a more even frequency response, i.e., the reproducible frequency range from 33 to 46 hz, then there is a strong attenuation of the volume. This is where the cons end, now about the pros. The box has a very compact size, which will allow you to save the trunk. Although the speaker is 8 inches (20 cm) in size, its power rating is 750w RMS.
The result is a very decent volume for such a small subwoofer. Of course, it will not create strong sound pressure in the car, this is the task of larger diameter subwoofers, but it is within its power to back up a not very loud front with a dense bass.
Box detailing
A small number and a simple shape of the subwoofer cabinet parts make it possible to make them in a home workshop or order them at any furniture company. In the first case, you can be proud of your skill, and in the second, save time and nerves. It should be noted right away that the most important parameter that should be paid attention to is the solidity, structural strength and tightness of all subwoofer connections, this is much more important than appearance.
The dimensions of the parts are as follows:
| number | the name of detail | Dimensions (MM) | PCS |
|---|---|---|---|
| 1 | Right and left walls | 235 x 296 | 2 |
| 2 | Back wall | 235 x 544 | 1 |
| 3 | front wall | 235 x 496 | 1 |
| 4 | Bass reflex wall 1 | 235 x 230 | 1 |
| 5 | Bass reflex wall 2 | 235 x 407 | 1 |
| 6 | Lid and bottom | 580 x 296 | 2 |
Characteristics of the box
| 1 | subwoofer speaker | Ural Patriot 8 |
|---|---|---|
| 2 | Port setting | 39 Hz |
| 3 | net volume | 22 l |
| 4 | Overall volume | 46,5 l |
| 5 | Port area | 70 cm2. |
| 6 | Port length | 65,45 см |
| 7 | Front wall recess | 1 см |
| 8 | Material thickness | 18 mm |
| 9 | Dimensions MM (L,W,H) | X x 296 580 271 |
| 10 | Under what body the calculation was made | Sedan |
Recommended Amplifier Settings
We understand that a large number of people visiting our portal are non-professionals, and they are worried that if they are configured and used incorrectly, they can render the entire system unusable. To save you from fears, we have made a table with recommended settings for this calculation. Find out what wattage rating (RMS) your amplifier has and set the settings as recommended. I would like to note that the settings indicated in the table are not a panacea, and are advisory in nature.
| Setting name | RMS 400 – 600w | RMS 600 – 900w | RMS 900 – 1300w |
|---|---|---|---|
| 1. GAIN (lvl) | 85 - 75% | 75 - 60% | 60 - 50% |
| 2. Subsonic | 30 Hz | 30 Hz | 30 Hz |
| 3. Bass Boost | from 0 to 50% | from 0 to 30% | from 0 to 15% |
| 4.LPF | 50 – 100hz | 50 – 100hz | 50 – 100hz |
*PHASE - smooth phase adjustment. There is such an effect as the subwoofer bass is temporarily behind the rest of the music. However, by adjusting the phase, this phenomenon can be reduced.
Before installing the amplifier, read the instructions, in it you will find what cross-section of the power wire is necessary for the stable operation of your amplifier, use only copper wires, monitor the reliability of the contacts, as well as the voltage of the on-board network. Here we have described in detail how to connect the amplifier.
box frequency response
AFC - graph of the amplitude-frequency characteristic. It clearly demonstrates the dependence of loudness (dB) on the frequency of sound (Hz). From which you can imagine how our calculation will sound, installed in a car with a sedan body.
Conclusion
We have put a lot of effort into creating this article, trying to write it in a simple and understandable language. But it is up to you to decide if we did it or not. If you still have questions, create a topic on the "Forum", we and our friendly community will discuss all the details and find the best answer to it.
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