How to Tune an Amp With a Multimeter?

I think you want to know how to tune an amp with a multimeter?


A multimeter also called a VOM or a multitester is a tool which measures voltage, current and resistance in an electrical device or a machine.

Amp is written as a short form for word amplifier, that is an electronic tool whose feature is to enhance the power of voltage or current changing with time. 

Basically, this raises an amplitude signal. To get the perfect sound out of the sound system or stereo of the car can be truly entertaining and exciting.

Although, tuning amplifier has been for a long time misjudged because the majority of people don’t know how to get adjustment control. 

Absence of the gain control can lead to the clipping consequently output voltage doesn’t match the input, that winds up not being prevailed.

Our team mentioned below 9 step process that how to tune the amplifier to the quality sound utilizing a multimeter

You are able to adjust all an amplifier gains and bass through physically tuning it moreover listening to sound this is delivering. This technique is, very tedious although not suggestable. Our ears are not able to capture small distortions in sound delivered by a defective amplifier.

There is a 9-step process that how to tune the amplifier for the sound quality utilizing a multimeter. 

First Step

Get devices and items required to tune an amp ready. These things are mentioned below with the purposes.

A multimeter for tuning an amplifier.

A speaker connects to amp after and during testing.

The manual of the amplifier where from you refer details of the amplifier.

Calculator to summarize voltage estimation.

Audio source or 60-Hz the test tone CD

Second Step

Test the speaker’s resistance connect to the amp through utilizing a multimeter. When starting the measurement, the reading of the meter must be zero (0). Addition black lead into COM and red lead into VΩMa jack. Now you should turn on multimeter. 

A selector in ohm (Ω) space moves to read position 200. Prior to making any estimation, make sure the reading should be Zero (0). And leads aren’t touching. This process depicts not any resistance between leads. Then note down its readings while naked circuit cables arrive at the leads.

If reading is just 1, then dial should be turned single position clockwise, separately. Continue turning the dial, if essential, equal to 2000k till then get one more reading except 1. When you are completed, note ohm resistance. 

Third Step

Carefully study through manual of the amplifier to discover the suggested wattage output as well as compare this against ohm resistance.

Fourth Step

From positive terminals on the amp, find the positive wire of speaker. Adjust all EQ such as treble, bass, loudness and settings of bass boost to zero otherwise turn them off. Then rotate its gain counter-clockwise to get zero.

Fifth Step

Turn the volume of the head unit to the greater part of the max volume and find out a higher volume of radio or stereo from the manual as well as multiply that number with the percentage of over 75%. 

Sixth Step

Calculating necessary air conditioning voltage for an amp is really clear. The equation is as per the following; AIR CONDITIONING VOLTAGE = RESISTANCE (Ohm) X WATTAGE SR. Suppose a 600Watts amp at the 2-Ohms.

In concentrate, that would be the 600×2=1200. Estimate the SR of 1200; at that point, its voltage should be 34.641 in case of the single gain control.  

The Amplifiers with 2 gain controls should be treated freely. If the amp is 200Watts 4 channels which will be 800Watts in the total for 2 various amplifiers.

Above mentioned formula is, in this way, just applicable while calculating gain control and voltage per channel. 

Seventh Step

Disconnect amp from your speaker, obliging it. Though, ensure the amplifier still associates to a power source.

Prior you continue to do whatever else, ensure that 2 devices are disconnected already. Between the frequencies ranges of the 60Hz to 50Hz, put in the test CD which has Sine – wave tone check at 0db. 

It is appropriate for a 1000Hz amp, a subwoofer, otherwise any mid-range amp. The Redo test tone a few times or adjust the head unit for replaying test tone consistently.

Eighth Step

Make sure you adjust every amplifier in the music structure with the nearby focus on VOM. Such a procedure will make sure speakers provide the best output as well as function appropriately. Reduce the volume on HU until this read 0. After it, turn off your amplifier. 

Ninth Step

Take all wires from your speakers and then reconnect to their positive terminals correspondingly. This is advisable to be cautious during the procedure for avoiding any damages thusly, make sure every cable link effectively to correct terminals.

These precautions empower you for avoiding unnecessary mishaps. The speaker won’t perform when its wires are connected wrongly. Turn on HU and remove recently played test CD. Play music which you know about and then listen in for every distortion. Such sound-bends come as: 

  • Whiffing 
  • Cracking
  • Buzzing
  • Hissing
  • Whomping

If lows and highs of the music appear balanced, however, the bass sounds appear such as it is originating from far ending of stereo this is suitable to delocalize amplifier filter.

The delocalization is finished through adjusting the amp’s low pass channel even lower. Adjusting your channels empowers to smooth roughness in sound.

Such as, if sound vocals are excessively deep, then adjust the high pass filters on the amp for including extra high notes. In contrast, if vocals sound is very low then re-organize high pas filters for including extra low notes


The above-mentioned procedure is appropriate to the 4-channel amplifier as well. It raises the sound level and consequently creates first-class music. Despite the type and design of the amplifier, you are utilizing, the multimeter is the perfect tool for tuning it.      

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