Showing posts with label subwoofer. Show all posts
Showing posts with label subwoofer. Show all posts
Saturday, November 1, 2014
Subwoofer Speaker box design
The order of 4 or sealed rear chamber bandpass system is essentially a system of watertight enclosures with the addition of an acoustic filter for the driver. The resulting system usually provides a lower cut-off frequency, the compromise that a larger case. The space can be reduced by two drivers in isobaric configuration.
4th-order bandpass systems generally show better able to handle the functions that the other major systems are considered. The transient response and is second only to the sealed enclosure systems, making it a good choice for subwoofer applications.
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| Subwoofer Speaker box design |
Since all output 4th order bandpass system is via the port, the largest diameter possible for the port area should be used to minimize noise from the port. The ports must be incinerated where possible, for the same reasons.
The 4th order bandpass system rarely allows a perfect bandpass response - there is usually an out-of-band noise present in the production. A notch filter can be used simply to reduce the noise as audible. Otherwise, a lowpass filter used in series with the driver, but the in-band response system may be affected if this approach is taken.
As the speaker sound 4th order band pass issued by the openings or ports on the port side of the box, the port noise inevitable.
This unwanted noise can be minimized by a notch filter and the largest diameter possible for the port of the area should definitely be used. Another option is to burn the ports of the 4th order bandpass room as this will certainly help to reduce unwanted extra from the subwoofer.
Friday, September 12, 2014
Subwoofer Amplifier Circuit 60W
Using the STK4038X audio amplifier IC, can be designed a very simple high power and efficiency audio power amplifier . This circuit is manufactured by Sanyo Corporation and will provide a output power of 60 watts on a 8 ohms load or 4 ohms load with 0.008% distortion . The output power that is provided by this audio IC , can be more higher , but with more distortion.If you will use a 8 ohms load you must power this audio amplifier project from a dual +/- 40 volts DC power supply and if you’ll use a 4 ohms load you must power this audio project form a dual +/- 33.5 volts DC power source. To prevent over heating the STK4038X audio power IC must be heatsinked on a good heatsink . Also you must use a very well filtered power supply ( a 10000uF capacitor will be fine for this audio project) .
Monday, September 8, 2014
Monday, September 1, 2014
Subwoofer amplifier schematic diagram
Amplifier circuit is very suitable for use in subwoofer speaker, because its strong. This circuit using ic, ic based on STK. to use it can be used on cars that use speakers or a subwoofer system in his car. 30 V supply voltage that has been rectified. Power output 20W mono.
Part List :
R1 = 100K
R2 = 47R
R3 = 100R
R4 = 1R
C1 = 220uF
C2 = 100uF
C3 = 100uF
C5 = 10uF
C6 = 1uF
C7 = 1uF
C8 = 1000uF
C9 = 0.1uF
IC = STK011 , STK015 , STK016
Tuesday, August 26, 2014
Calculation subwoofer using WinISD
In this article I want to talk about and show how you can calculate the subwoofer and what you should pay attention when designing in the following programs: WinISD 0.44, WinISD 0.50a7. Detailed description of the program WinISD .
Payment will be made for a box of ten-inch speaker Audiobahn 1051T. Lets start! Run the program WinISD 0.50a7
1. Create a new project (New Project).
2. By pressing this button, select the speaker of the database program.
3. View the T / S parameters.
4. T / S parameters. Click on (Next)
5. Selecting the number of speakers.
6. Type of installation.
Normal - all the speakers are on the same panel.
Isobaric speakers are face to face.
Click on (Next)
7. Efficiency speaker. Shows what type of housing is more suitable.
8. Selecting the type of box.
Sealed box - the name speaks for itself
Vented - box equipped with a pipe (Bass reflex).
Band pass 4th order - the speaker is located between the two chambers, one of which has a phase inverter.
Band pass 6th order - is between the two cameras equipped with both phase inverter.
Passive radiator - one closed box speaker and passive radiator (speaker without magnet)
Choosing which type suits us and click on (Next)
Next, the program offers a way to design the frequency response in different ways. I do not focus on this point and click Next.
If you select Passive Radiator enter the program will offer the following T / S parameters of the passive radiator:
Vas - is excited indoor air volume speaker.
Fs - resonant frequency.
Xmax - the maximum stroke of the diffuser.
QMS - Mechanical Q.
SD - diffuser area.
Next we consider the example program Band pass fourth order.
Tab Driver.
9-10. Again, you can specify the number and type of installation speakers.
11. Additional features.
Tab Box.
12-13. Camera box
14. Volume of the chamber.
15. The frequency of the camera settings.
Tab Vents (Phase inverter (s))
16. Number of bass reflex (s)
17. Fazoinvertor diameter (s)
18. Length bass reflex (s)
19. Type of round or rectangular. You can change the nav on a circle.
20. View fazoinvertora.
Turn to the main calculation box:
21. Click on the box shown schematically on the right mouse button while holding move the cursor along the axis (X) in-law to change the volume on the horizontal axis (Y) vertically to change the frequency. Similarly, the left mouse button to change the parameters of the lower chamber. The top of the curve should be above the red line between 35Hz and 120Hz if this subwoofer as widely as possible and smoother.
Transfer function magnitude. Amplitude frequency characteristic
Like this, but the lower limit of 40 Hz and the upper 113Gts is also suitable.
Where I marked with red dotted lines in practice there will be cut frequency crossover.
Select dates: Maximum Power.
Maximum Power
In this graph, the program shows the maximum power versus frequency. It can be seen that there is recession recession peak power 60 watts 39 hertz in practice cone speaker lacks stroke (Xmax) and an unpleasant sound - distortion. On the finished product it must also take into account and to limit the power
Select dates Maximum SPL
Maximum SPL. This chart shows the maximum sound pressure
Also seen a decline. For the same reason. Last two graphs from another speaker, I showed them to have clarity.
Here are graphs for our guinea. First a little far-fetched at a frequency of 0 Hz to 25 Hz and all the speakers there is a recession.
Now we must determine the size of the box will be installed speaker.
To do this, run the program WinISD 0.44 push a new project.
We need to introduce our dynamic parameters in this program because at its base it is not for this press «New»
We proceed to WinISD 0.50a7
22. By clicking this button you can see the T / S parameters that need to be put in WinISD 0.44.
Introduce the parameters and click OK to close the window so as not to interfere.
Create a new project.
23. Reposition the tick to select a speaker.
Press on, and do just as well as in WinISD 0.50a7
Transferring the parameters of the box in WinISD 0.50a7 WinISD 0.44.
24. Push to start to count the size of the box.
25. Press and the program provides the optimal dimensions in her opinion.
In disposal we have 10-inch speaker complete with its outer diameter of 300 mm to fit it into the box dimensions W and D Undue be less 300mm
26. Width 300mm inscribe equals 0,300 METERS
30. You can change the unit of measure by simply clicking on the dimension in this case the letter «m»
28. Length of 0,300 meters is entered
27. Push the «H» program shows height.
31. Pay attention to the L1 and L2 is the height of the cameras should look to tie the speaker depth does not exceed the value of L2.
But we must take into account the thickness of the material he is still in the lap of nutria has a shelf where the speaker stands and also take into account the thickness of the speaker himself, he, too, takes a beat him if I already priced big box in there to stand spacers they should also be taken into account. 7 parts obtained to calculate the correct items is necessary to consider that some of them will be unnecessarily whipped program shows the inner diameters. Letter «P» Ill puncture the material thickness which must be added to the other values.
1) D x W
2) D x W
3) D x W
4) H + (P * 3) x D
5) H + (P * 3) x D
6) H + (P * 3) x W + (P * 2)
7) H + (P * 3) x W + (P * 2)
Gets the size of the items if the material thickness of 20mm:
1) 300x300
2) 300x300
3) 300x300
4) 420h300
5) 420h300
6) 420h 340
7) 420h 340
Now we can proceed to the calculation of the phase inverter.
32. Type fazoinvertora we use a rectangular
33. Length. When the end of the phase inverter is shifted to the wall box
it virtually lengthened, and in fact it turns out that he is not listening on that frequency and greater long WinISD 0,44 ignores this virtual extension can be calculated by the formula itself but its easier to look in the program WinISD 0.55a7
I repeat: it is really only when the end of the phase inverter is shifted to the wall box and when he speaks it is not valid. So the program shows WinISD 0,44 28,86 cm and WinISD 0,55 25,64 a7 sm.F phase inverter will be installed in the item number 4 420h300 subtract 20 from 420 is the height fazoinvertora get exactly 400 square fazoinvertor unnecessarily adds another item 8) 300h255
Here are the final dimensions of parts and their number.
1) 300x300
2) 300x300
3) 300x300
4) 400x300
5) 420h300
6) 420h340
7) 420h340
8) 300h255
34. Air resistance. Air resistance in a vented enclosure to do as little as possible by increasing the opening area of the phase inverter.
Sunday, August 24, 2014
Differences subwoofer and woofer speakers
In the world of electronics, especially in terms of audio must be familiar with the term speaker, be it a woofer or subwoofer. Each of these types of speakers choose a variety of characteristics and differences. Here will be explained a little about subwoofe speakers and woofer speakers, so we can find out where the fine for use as needed.
| Subwoofer Speaker |
Subwoofer is a bass speaker system yangg could produce a lower frequency than usual with an additional woofer low pass filter.Walaupun sub-woofer does not have to wear two opposite poles mounted speakers, a good sub-woofer is that using 2 woofers for the volume remains loud. Sub woofer with the woofer does not always have a special, because ordinary woofer can be built into the subwoofer, by adding an amplifier low pass filter. Sound system (sound system) even if only to include a sophisticated subwoofer, along with some other speakers.
And in other words, the difference in bass speaker (woofer) with speaker Sub Woofer:By description SUB word, it means the speaker must be able to handle bass tones below.
Bass speakers can use the speakers with her without a rubber edge cones.
Speaker Sub Woofer, using cones with rubber edges, so its more flexible movement of cones.
Performance of all speakers (tweeter, Middle, woofer or sub woofer) strongly depends on the source signal and Pre Amp and Power of his amps. So if not supported by all three of these factors, it will not produce a good tone (tone control).
Regarding his Ohm, 100%, depending on its output amps.
Like the amps in the car, the output is 4 ohms, while the home is generally 8 ohm amp, but there is also a distinguished 16 ohms. So adjust the speakers to the amplifier.
So the key difference lies in the low tones (bass) are produced. Subwoofers capable of producing a low tone below the average normal woofers, and the tone is also more melodic and soft . So what can I share, may be useful to visitors all. Thank you
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