How Do I Change 4 Ohm Speakers to 8 Ohm?

If you want to know how much power a speaker can handle, you need to know its ohms rating. In the case of DC current, this number is more than the electrical resistance of the volt-ohm meter used. Consumers may categorize speakers to match them with amplifiers based on this grade, but it’s only one of several.

Impedance of Speakers

Impedance of Speakers

Ohm measures electrical resistance. High ohms demand more voltage to power the speakers. Ohm consumption is system-dependent. Speakers and audios utilize various ohms to power on.

Be cautious while combining various Ohm’s. If you combine ohms, do the math to prevent destroying the system. Pairing 4 and 8 ohms makes your speaker sound better and work properly.

A typical speaker impedance of 16 ohms was used in tube amplifiers in the early years of their development. When transistor amplifiers were developed, speaker drivers having an impedance of 8 ohms or less were found to be the optimum fit for them. Since the driving voltage was restricted to 12-volt DC automobile battery-alternator electrical systems, early car stereos had to employ speaker drivers with a smaller impedance of 4 ohm to obtain the loudness they required.

Those unpleasant bashers on the streets are a result of modern vehicle amplifiers being able to natively spike their output voltage. For an 8-ohm speaker to permit the same amps (and wattage) as a 4-ohm speaker, an amplifier must apply double the voltage. An amplifier designed for 8-ohm applications might burn its output transistors when used with 4-ohm loudspeakers at medium to high volumes. As a result, it’s critical to thoroughly grasp the amplifier’s output limitations and the justification for modifying speaker impedance—either up or down—before making any changes.

Connection in Series or Parallel

Playing around with the number of drivers and how they are configured is the quickest and simplest approach to get the right impedance for a system. An 8-ohm system impedance may be achieved by a series connecting two 4 ohm speaker drives (the amp addition to speaker 1 +, the speaker 1 common to speaker 2 plus, and the second speaker 2 commons to the amp common).

The overall resistance is 2 ohms when linked in parallel (amp plus both to speakers 1 & 2 +, & both speakers 1 & 2 shared to the amp common) Using four 4 ohm loudspeakers in series with two parallel linked pairs results in—you guessed it—four ohms. A 6-ohm system may be created by connecting two 4-ohm speakers in parallel and single 4-ohm speaker in series.

Using two 4 ohm speakers in series and a 4-ohm speaker in parallel, the result is 2.67 ohms. It’s simple to figure out the formulas: Simply add all of the resistance values together for speakers connected in series. For speakers that are linked in series, the formula is: 1/R total = 1/R (speaker 1) + 1/R (s2) + 1/R s3… and so forth.

Amplifier Protection

8-ohm speakers may be connected to 8-ohm amplifiers without harm, however, the maximum volume they can produce may be less than that of an 8-ohm loudspeaker.

Process of Converting 3-ohm to 8-ohm Speaker

3-ohm to 8-ohm Speaker

The ohm speakers play a significant role in the huge output of audio. In addition to producing high-quality audio regardless of whether used inside or out, the speakers also offer a number of other advantages. Additionally, the 3-ohm speaker is more powerful and portable, making it easier to move from one location to another.

In order to successfully convert your 3ohm speaker to an 8ohm one, there are particular measures you may take. Understanding how the 3-ohm speaker handles impedance is the first step.

Calculating Impedance of Speakers

Use ohms to acquire your answers while employing the series connection approach. With a parallel connection approach, choose 1 ohm since each loudspeaker has the same ohm impedance. For instance, 3 ohms and 8 ohms (3+8 = 11 ohms). They’ll both be 8 ohms and 8 ohms since they’re two (8/2 = 4 ohms). However, if there are three of them, the answer is 2.666 ohms when you divide 8 by 3.

Step-1: To begin, turn off the power to the speaker and make sure it’s not damaged. Electric shock or internal part blowing are two examples of risks that may be avoided with such a procedure. Another option is to use an antistatic wrist band as a kind of protection.

Step-2: Determine how much speaker wire is needed to link the amplifier’s input to the speaker’s output. Don’t be afraid to snap a picture of the item’s measurements using your cell phone. Do not forget to plan out your path for connecting your amplifier’s speaker wire to your speaker and vice versa.

Step-3: To begin, use a non-inductive resistor with a power rating of 25 to 50 watts in series with each speaker’s positive line to guarantee a 3 to 5-ohm impedance. A 3-ohm speaker (red) is connected to the 8-ohm speaker’s +ve wire (blue) (white color). There are 2 techniques to implement this: in parallel or series. To avoid damaging or blowing a speaker or a fuse, double-check all of the connections.

Step-4: Link the batteries to a power source and see whether they can be turned on with adequate voltage. If the battery requires to be disconnected from the source of power, make appropriate alterations. Furthermore, if you are unable to complete the procedure on your own, get assistance.


Increasing the impedance from 4 to 8 ohms improves the clarity and transparency of the sound. With the knowledge you’ve just obtained, you’re well on your way to achieving your goals.

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