Note for music lovers – sound quality directly depends on the voltage supplied to the speakers. By ear, this parameter is impossible to determine. Yes, and turning the knobs on the amplifier, trying to adjust the filters correctly, is useless, since they often give incorrect information. Therefore, setting up amplifier filters at home is easier to do with a conventional multimeter. The detailed instructions in this article will help even beginners who want to listen to their favorite music with perfect performance to cope with this process.
However, first you need to prepare the multimeter itself, as well as a calculator and a screwdriver, which are needed for calculations and auxiliary work. You will also need to find the amplifier’s instruction manual and burn the test signal to a CD or other storage device in stereo format. The frequency of the test signal in this case depends on the preferences of the music lover and is usually between 40 and 70 Hz.
How to configure
The essence of this method is that the amplifier when playing musical compositions supplies the speakers with the “correct” voltage. To do this, the owner of the amplifier will have to read the user manual carefully to find out the power recommended by the manufacturer of the audio device (DIN) and the maximum possible impedance of the speakers connected to it.
After that, you will need to take a calculator to do simple calculations:
- multiply DIN by speaker impedance;
- take the square root of the resulting number.
In practice, this process is as follows. If the rated power of the amplifier is 60 W and the speaker impedance is 4 ohms, then you need to multiply these numbers and extract the square root of the resulting number (240 V), which will be equal to 15 .5V.
It now remains to adjust the filters of the amplifier (we cut at low frequencies) so that when playing audio compositions, the voltage on the speakers does not exceed the value obtained during the calculations. In our case, it is 15.5 V.
To do this, the owner of the amplifier will need:
- disconnect all speakers and the subwoofer from the audio device;
- set the sound volume in stereo mode to 3/4 (75%) of the nominal level and remove Gaim to “zero”;
- activate the alternating current (AC) multimeter mode and select 200 V;
- we connect the meter to the amplifier instead of the column, observing the polarity of the wires;
- insert the CD with the test signal into the audio device and click the “Start” button;
- take a screwdriver and turn the adjustment screw on the channel until a value of 15.5 V appears on the scale of the multimeter;
- configure the rest of the channels in the same way.
After this adjustment, the owner of the amplifier can be sure that even the lowest bass will not damage the speaker coil if the user listens to music at 75% of the maximum sound volume.
Use these tips to enjoy clean music or share your own ideas for fine-tuning your amps.