How to make an inexpensive and good amplifier for a subwoofer yourself

A quality branded subwoofer is expensive. Explanations for this are many: these are special acoustic requirements for the case, and a high-quality speaker, and a large output cascade power, and a special, very careful factory setting.

So, the body. At low frequencies, all defects of any acoustic system are manifested. Resonance frequencies lead to undesirable vibrations, felt as a rattling. In order to avoid the wrong sound, the subwoofer's enclosure is clogged with sound-absorbing fibrous fillers, but if the shape and dimensions are calculated and picked up incorrectly, such a measure will only give a partial improvement.

The speaker is a very important element of the design. Its power should be not less than 100 watts, and the characteristics must provide for the reproduction of infra-frequencies. Now they are produced relatively small - from 6 to 15 inches in diameter.

To assemble the amplifier for a subwoofer with their own hands can be an experienced radio amateur who has the practice of installing and tuning complex equipment. This is not an easy task, despite the fact that modern semiconductor components have a high degree of integration. It is required not only to be able to read the circuits and understand the principle of the low-frequency amplifier, but also to know the etching technique of boards and other useful skills, including such a simple matter as high-quality soldering.

Having assembled to make an amplifier for a subwoofer with your own hands, you just have to decide on the purpose of the device. If it is designed to work in the car, then the requirements for it will be one, and if for the home theater - then others.

In the first case, the supply voltage is limited by the operating value of the on-board electrical system, usually it is 12 volts with a minus on the case. The task is simplified by the fact that a powerful power transformer, amplifier and stabilizer is not required. But you have to collect the circuit yourself. Good reviews were given to the TDA7293, which withstand a high output current and provide enough power (up to 100 watts) to boost bass.

If the self-made amplifier for a subwoofer is for home cinema, then the requirements are different. You can actually go the same way and assemble it according to a similar scheme, but you need a fairly powerful transformer with a power supply, all of which needs to be placed inside the enclosure, where a large volume loudspeaker and bass reflex are already installed. In this case, we should not forget about the heat transfer, the radiators will also take their place.

There is another way to solve the problem - do not assemble the amplifier for the subwoofer yourself, and use a ready-made scheme, for example, from amplifiers "Amphiton" or "Brig-001" still Soviet-made. You can buy them at a very affordable price, especially if one of the channels does not work. Convenient modular system, ready-made power supply and adjustments create all conditions for using this high-quality equipment, and you do not have to worry about how to make an amplifier for a subwoofer.

LC-filters limiting the frequency range of the middle and high frequencies should be located both at the input and at the output of the device, directly in front of the speaker. When assembling an amplifier for a subwoofer with your own hands or using a ready-made circuit, care should be taken also for limiting noise, and for the durable and reliable operation of this electronic device sensitive to overloads.

And I also want to say that you should not overly obscure the results of your labors to neighbors, they will not appreciate it.