How to Connect 4 Speakers to a 2 Channel Amp In 2021

How to Connect 4 Speakers to a 2 Channel Amp In 2021

Many people believe that a 2-channel amp can only handle a handful of speakers, however, this isn’t always true.

You can take the impedance of the speakers into consideration and divide the power output evenly between the two channels to connect four speakers to a 2 channel amplifier. Four speakers can be connected to a two-channel amplifier in one of two main ways: in parallel or in series. 

The one to choose is determined by the impedance levels and restrictions of both the amplifier and the pair of speakers. When speakers are wired in series, the impedance supplied to the amplifier is higher, whereas when they’re wired in parallel, the impedance supplied to the amplifier is reduced. 

Amplifiers have upper and lower limits on impedance, and it's critical to keep within these parameters. If overloaded, it can cause damage or result in an even worse experience. Here, we’ll be discussing how to connect 4 speakers to a 2 channel amp!

Determining Whether to Use The Series or Parallel Method

The first thing you need to do is calculate the minimum and maximum impedances of the amplifier you'll be connecting to the speakers. The amplifier will be damaged if the input is below the minimum impedance or above the maximum impedance. 

As a result, ensure that the load is neither too low nor too high. The impedance of the amplifier can be found on the label or in the manual and is measured in ohms. The same goes for the speakers.

Next, multiply the impedance of two speakers that will be connected to one channel. If the total aggregate of both speakers' impedances is within the amplifier's limits, you can then start connecting them in a series circuit.

For instance, suppose you have two 4-ohm speakers. When you wire up in series, the powers are combined. As a result, the sum of both powers will equal 8 ohm. 

This means that you can connect using the series method if your amplifier can tolerate 8 ohm on each channel. If your speakers can't be wired in series, the other option is to wire them in parallel.

Multiply the impedances of two speakers. Next, divide them by the sum of their impedances. If the response falls within the parameters, the speakers can be linked in a parallel circuit. 

You can't connect them to that amplifier if the impedance from both ways isn't within the restrictions. You can wire them once you've decided the method you'll use to link them.

How to Connect 4 Speakers to a 2 Channel Amp In 2021

How to Connect 4 Speakers to a 2 Channel Amp

1. Wiring in Series

For this kind of setup, we’re referring to amplifiers that power passive speakers. For DJs who use speakers for parties and other applications, powered or active speakers are available, making setup a breeze. These don’t necessitate the same level of amplification. 

The speakers in series configuration have not always been the best, but it’s absolutely possible, even if it doesn't make the most out of all of your equipment. Using the amp's full power, the speakers may work together to generate a rich and clear sound. 

You must ensure that you’re aware of the ohms, as well as your equipment's limits. You risk damaging all of your gear if you don't, and this is also why you should only connect devices that have the same impedance. 

If you've settled on having speakers in series circuits, you can wire the amp to the speakers by following these steps:

  • Start with high-end equipment. It's best to have four matched speakers and a good 2-channel amp. On the amplifier, locate the positive and negative terminals. You’ll be able to identify them from basic + and – indicators, which may vary depending on the amplifier model.
  • Next, connect the positive terminal of the first speaker in the series to the positive terminal. You'll be delivering the signal to the second speaker from here, so connect speaker one's positive terminal to speaker two's positive terminal. 
  • The same processes can then be used to link up all the speakers. Verify that there is no broken connection and that all of the speaker wires are linked up properly. A loose connection has the potential to cause harm.
  • Close the circuit by connecting the negative terminal of your 4-speaker system's final speaker to the amplifier's negative terminal. This will close the loop, so instead of connecting all of the amps, you have to only do it once.

2. Wiring in Parallel

If you want to know how to connect 4 speakers to a 2 channel amp, another way you can do it is by wiring in the parallel configuration. 

  • To do this, connect a wire from the left channel's negative terminal to the first speaker's negative terminal. Next, connect a wire from the left channel's positive terminal to the first speaker's positive terminal. The left channel's and first speaker's corresponding terminals will be linked together in this manner.
  • Make a similar connection from the first speaker to the second speaker. Two speakers will be linked to one channel in parallel as a result of this. Therefore, all four speakers will be wired in parallel to two amplifier channels. 

Audiophiles will always have debates on which is preferable between the parallel and series methods, but many will agree that a parallel connection system sounds better provided  that it’s correctly connected and that the amp is decent to begin with. 

You must ensure that there’s sufficient power, or the amp's sound will quickly diminish and the sound will end up being terrible. The parallel circuit links all four speakers in a daisy chain setup. This means that the negatives and positives of the speaker are linked to the amplifier's outputs. 

This is a very straightforward way of connecting four separate speakers to one amp without having to deal with complicated cabling. Although it’s not the most attractive on the back of your amp, it works.

3. Connecting Using a Speaker Selector Switch

Using a connector switch is yet another way to connect 4 speakers to a 2 channel amp. Speaker selector switches deliver sound to multiple speakers while safeguarding the amplifier from overloading. They're usually utilized with low-power amplifiers of up to 100 watts. 

Failure to safeguard your amplifier can result in a variety of problems, such as damage or the amplifier entering protect mode

This is the safest way to connect all four speakers to an amp, and while you'll have to invest in some additional equipment, it's well worth it to assure a secure setup. The amplifier's output is connected to the speaker switch, which then links to each speaker independently. 

This process is repeated, with both positive and negative ends connected to the speakers. Although you end up with a lot of cables, handling all the wires is easy. Because of the speaker selector switch, the majority of the speaker resistance is absorbed. 

Both the amplifier and the speakers are permitted to operate without being overloaded. The speaker switch allows you to manage the volumes sent to each speaker, thereby separating the system into two groups of speakers with a control switch to merge the two. 

Take note that this method is intended for use with multi-room speaker systems in your home. It may not function well with amplifiers that output more than 100 watts.

Tips For Connecting 4 Speakers to a 2 Channel Amp

  • Verify the impedance of the audio equipment you're connecting to ensure that you're obtaining a completely compatible arrangement.
  • Avoid pushing the amp to its limits, as this may cause damage and make it difficult to produce bass.
  • Don't put too much power into the amplifier. You risk destroying your amp if you try to make it accomplish too much.
  • The amplifier's power is restricted which means that if you want more power, you'll need to upgrade your equipment. You can't force an amp to do more than it can handle. 
  • Always read and follow the manufacturer guidelines and take all necessary safety precautions.
  • Don't take any chances. If you're not sure if connection with your amps or speakers is possible, don't try it. 


The three methods listed above each have their own set of advantages and disadvantages, but they’re all ways that get the job done. It's entirely up to you to decide which approach to utilize.

Even though all of the ways we’ve covered above will work, be careful not to overload your amplifier. Remember that connecting the speakers in series decreases the amplifier's impedance whereas wiring them in parallel raises it. This has the potential to harm your amplifier.

When it comes down to how to connect 4 speakers to a 2 channel amp, using a selector switch is the best-suggested technique to connect many speakers to a single amplifier. It not only ensures the safety of your amplifier, but it also makes setting up and controlling your music system a breeze and prevents any damage. 

Equipment upgrades are always an option. Although larger amps with more outputs could do a better job, it's comforting to know that you have some alternatives if you find yourself in a situation that needs you to connect multiple pairs of speakers. 

Keep in mind that we may receive commissions when you click our links and make purchases. However, this does not impact our reviews and comparisons. We try our best to keep things fair and balanced, in order to help you make the best choice for you.

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