How to Convert 4-Ohm Speaker to 8-Ohm- Easy Ways

The dynamic impedance of a speaker is measured in ohms when an acoustic program is being played back. When using a volt-ohm meter to conduct DC, this number is higher than the electrical resistance of the circuit. The rating is merely one of several aspects that allow users to categorize and match speakers with amplifiers. There are many more factors to consider as well.

Most independent power amplifiers have enough power supply and power amplifier components to drive 4-ohm loads with ease. Many of them will operate twice as well with a 4-ohm load as they will with an 8-ohm load if their architecture is strong enough to push out the extra current. Again, ensure you have adequate ventilation to avoid heat meltdown.

This article will help you get a better understanding of the 4-ohm speakers and 8-ohm speakers. You will also find the frequently asked questions and answers well answered. For a better understanding, go through the tips and notes given for the best conversion.

How to Convert 4-Ohm Speaker to 8-Ohm

1. The speaker impedance

How to Convert 4 Ohm Speaker to 8 Ohm
  • Originally, speakers comprised 16-ohms in resistance since this was the most compatible with tube amplifiers at the time of their introduction. The optimum fit for transistor amplifiers was later found to be speaker drivers with an impedance of approximately 8 ohms, which gave the best combination of power output, loudness, and minimal distortion. The low impedance of 4-ohm speaker drivers was required to achieve the necessary volume levels in early vehicle stereos, albeit at the expense of some audio quality due to the driving power being restricted to 12-volt DC automotive battery-alternator power equipment.
  • As seen by those irritating thumpers stalking the streets, modern car amplifiers can internally jack their output voltage. A 4-ohm speaker will accept the same amount of amperage (and consequently watts) as an 8-ohm speaker if the amplifier applies twice its power. Therefore, it is critical to fully comprehend the output restrictions of an amplifier that will be employed and the reasoning behind modifying the speaker resistance, whether down or up in value.

2. Parallel or series connections

Parallel or series connections
  • Experimenting with the quantity and arrangement of drivers is the most straightforward and effective way of getting the required impedance. When 2, 4 ohm drivers are connected in series, the total impedance will be 2 ohms. 4, 4 ohm speakers will create four 4 ohm speakers when linked in two parallel pairs.
  • A 6-ohm system is created by connecting two 4-ohm speakers in parallel with a 4 ohm speaker. 2.67 ohm is obtained by connecting two series of four ohm-latus in parallel to a four ohm-layer. The formulas are relatively straightforward: Sum up all of the impedance values, as well as the time, for a series of speakers that are linked. The calculator separates speakers that are connected in parallel.
  • It is possible to adjust the total impedance when you link two or more loudspeakers to a single amplifier’s output. When connecting speakers, you have the option of wiring them either in series or parallel. In a series wiring configuration, the “hot” wire of one speaker is linked to the “ground” wire of the first, whereas in a parallel wiring configuration, both the “hot” and “ground” wires of one speaker are linked to the “ground” wires of the next.

Similarly, two 4-ohm speakers series-connected add up to a total impedance of 8 ohms; two 4-ohm speakers linked in series add up to a total impedance of 16 ohms. It is more complicated to connect two speakers in parallel because you must multiply together every individual impedance and then divide the result even by the sum of all the impedances.

3. Matching of the impedance

Matching of the impedance
  • As with speakers, amplifier outputs have an impedance rating; 4-ohm speakers should be utilized with 4-ohm amplifier outputs, and 8-ohm drivers must be used with 8-ohm amplifier outputs. A mismatch between the impedances of the speaker and the amplifier’s circuits can cause damage to the amplifier’s circuits, as well as distortion and poor audio quality. In particular, this is a critical consideration when listening to loud music, as the amplifier’s power is put under the most strain at high volumes.
  • Impedance, like resistance, is a property of electrical circuits that restricts the electrical flow across them. Resistance and impedance are quite similar, although impedance varies with different audio frequencies, whereas resistance is normally constant for all audio frequencies. Because of the interaction between the voice coil as well as other electronic components, impedance is created. This grade is based on an average of a wide center frequency range measured across the speaker’s frequency response spectrum.


Even though a given loudspeaker is rated for 4 ohms, it may produce a more stable load for an amplifier to drive than another speaker rated for 8 ohms. This has everything to do with the capacitive reactance characteristic of loudspeaker systems. The impedance of a speaker changes as a function of speed.

A badly built loudspeaker may exhibit unpleasant impedance dips at specific frequencies. If the situation becomes too difficult, this may cause an amplifier to oscillate. A purpose-built 4 ohm sound system will often present a more optimal load to an amplifier than a badly made 8-ohm speaker system.

Frequently Asked Questions:

  • Which is the main difference between a 4-ohm and a 2-ohm car speaker?

Answer; 2-ohm and 4-ohm automobile speakers are fundamentally different in that they require different amounts of electrical energy from the amplifier. A higher powerful amplifier is required for 2-ohm speakers than for 4-ohm speakers. Because of this, 2-ohm speakers can create louder sounds than 4-ohm speakers, but the quality of the sounds they produce is inferior.


The lower the impedance falls, the thicker your speaker cables should be to prevent heat damage. Never reduce the impedance of an amplifier to less than its minimum value. Overheating can result from this, and high heat can cause long-lasting damage to electrical components. When used from moderate to high sound levels with 4-ohm speakers, amplifiers designed for 8-ohm loads may allow excessive current, causing the output transistors to overheat and burn.

Ensure you go through this article to understand the 4-ohm speakers and 8-ohm speakers and how to handle them. In case you are facing challenges when converting your 4-ohm speaker to an 8-ohm speaker, please seek professional help on the same. 

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