Saturday, September 09, 2017

Subwoofer Controller Frequency, Phase, Gain

To create a 2.1 audio system, 5.1 channel home audio or active subwoofer, low pass filter/ Subwoofer controller is required to pass the low frequency and eliminate the high frequency. Because of the low frequencies that spread in all directions, the music recordings are mono low frequency, namely the right and left it's same. So it takes only one subwoofer, this low pass filter circuit should be able to adjust the frequency of the crossover so that the overall response frequency can be flat and can adjust to the frequency response of the subwoofer speakers used. Below the circuit design of subwoofer controller:
Circuit Diagram Subwoofer Controller Frequency, Phase, Gain
Working Principles
U1 A/B NE5532 as a pre-amp which amplifying a voltage of about 3X. Then the output is mixed so it becomes a mono signal. Then the signal goes into U2A NE5532 which functions as a subsonic filter, ie signal with the frequency below 20 Hz is eliminated. Signals with frequencies below 20 Hz can not be heard and often cause damage the subwoofer speaker.

Then signals with frequencies above 300 Hz are discarded by U2B, whose output is fed to a low pass filter whose crossover frequency can be adjusted from 35 Hz to 150 Hz with U3A NE5532. With the U2B, the slope filter becomes sharper. U2B and U3A functioned as a second order Butterworth filter.

The output of the above filter is inputted to a phase regulator whose phase can be adjusted from 0 to 180 degrees. The goal is for subwoofer sound phase like the sound of satellite speakers. Due to the placement of the subwoofer which is often not parallel to the satellite speakers so that the required phase correction.

For making this subwoofer controller easier, I share the PCB layout design for it below:
PCB Layout Design Subwoofer Controller

Frequency, phase gain subwoofer crossover

If you have any question please make a comment on comment box below.

Electronic Circuit is a good site for hobbyist also who would like to try DIY because it shared good circuits. If you have a personalized circuit requirement you may feel free to request it through the comment box or contact me.


yes its really working same as crossover filter.

Can I use a one dual gang pot instead of having 2 seperate pots to adjust the frequency?

Yes, you can use stereo potentio meter. Actually, to set the frequency need stereo pot, because im using proteus, there is no stereo pot.

Can I get a complete list of parts?

you can see complete part list from schematic diagram image.

The values are barely visible.

Can I use a 10n capacitor in place of c2?

If its not clear please click image to view larger.

u can use 10n but more lower frequency

circuit is not shown in page, only pcb is shown, please help

Please refresh, the circuit diagram is attach on post

as advised,I have refresh the page but i think ckt is removed , because a blank page appears.
please advice.

Sir I need pcb file of this circuit in Proteus. Please give me.

Hi, this circuit looks like exactly what I need! But I can't make a PCB - do you supply kits or PCBs, please? If not, is it possible to have a file in a format I can send to a PCB manufacturer?
Many thanks for great ideas!

the label of each component is not in focus , I can t read the value

buenas tardes este proyecto maneja puro filtraje de frecuencias,de ser asi podrias indicarme como colocarle un toroidal para darle potencia y sea un subwoofer activo

very accurate and professional circuit diagram

Circuit image not clear brother

I want the details, R1-r22, c1-...

Many enthusiasts install the large subwoofers in the trunk but if you need that space to hold other belongings, you may want to reconsider. If what you're looking for is a deep bass and something that doesn't have a big ban, then you should just go with a normal subwoofer. For most people a smaller subwoofer will be sufficient for their needs. If you tend to play your music at low to medium volume levels, a small subwoofer will bring out the bass enough to enhance the quality of the music. You'll still get a deep and rich bass but of course you won't get a thundering base like the bigger speakers. Then there are the power requirements of the speaker The power requirement of the car subwoofer speaker has to match the amplifier. Obviously bigger subwoofer speakers will need more power or the amplifier simply won't be able to handle it. In some cases, the sound quality will be muffled or will start to distort if the amplifier cannot handle the power of the subwoofer speaker. Another thing to look at is to consider the different designs. Some speakers radiates sound from the side, front, or downwards. This creates a different listening experience. For example, the subwoofer that radiates the sound downwards will keep more of the bass inside your car and create a vibration in your car. car subwoofer