8 Speakers To 4 Channel Amp Wiring
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Quality sound output is only enjoyed by people who excel in component wiring and balancing. Wiring speakers to an amp can sometimes be challenging, especially if you have more speakers than the channels supported by the amplifier. This article helps you wire 8 speakers to a 4 channel amp. For example, you may want to wire 8 door speakers to a 4 channel amp.

To wire 8 speakers to a 4 channel amplifier, you can wire each 2 speakers together to create 4 combinations of 2 speakers each. You can then connect this to the 4 channels. However, this will increase the load on each channel so turn the gains down. This will also be half the impedance. For example, if you’re running two 4 ohm speakers on each channel, you will need an amp that can manage at a 2-ohm load. Alternatively, you run each pair in series instead of parallel.

How to wire 8 Speakers To 4 Channel Amp

What Is A 4 Channel Amp?

4 channel amps are built to conveniently power the standard four speakers in a car system. They are, therefore, crucial, especially where you need specific amps to perform custom installations in your car. Besides, they make it easier to toggle or bridge the different channels for some connections, particularly where you have more than 4 speakers.

If you have a 4 channel amplifier, the output terminals should be configured as shown below: 

Channel 1

The Channel 1 of the amplifier has two terminals – the positive and negative terminals. The first terminal is positive, while the second is negative. 

             “A” (positive)

             “B” (negative)

Channel 2

This channel has a similar configuration as channel 1. The terminals are marked as:

             “C” (positive)

             “D” (negative)

Channel 3

This channel also looks similar to channels 1 and 2 in configuration. Besides, the terminals are the same. 

              “E” (positive)

              “F” (negative)

Channel 4

Channel 4 is the last in the 4-channel amplifier. It has two terminals similar to the other channels. Similarly, the positive and negative terminals are positioned the same way as the previous three channels. 

              “G” (positive)

              “H” (negative)

This channel and terminal description will help you wire the 8 speakers to the amplifier correctly.  

Can A 4 Channel Amp Run 8 Speakers?

A 4 channel amplifier can power up to 8 speakers. If you do the wiring correctly, the amp will deliver up to twice the power output.

Although you can achieve both series and parallel connections, parallel connection delivers maximum performance. A 4 channel amp will comfortably run 8 speakers. However, you must ensure that the wiring process is done without error to avoid damaging the amplifier. 

How To Wire 8 Speakers 4 Channel Amp 

Connecting 8 speakers to a 4 channel amplifier can be a great experience if you know the steps to take and have the right tools.

You can adopt either series or parallel connection methods as we mentioned already. Whichever method you pick, you will have to connect 2 speakers per channel. Here are the tools you need for the connection:

  • High-quality speaker wires 
  • Electrical tape crimp tool 
  • RCA adapter cables
  • Ohmmeter  
  • Wire stripper  
  • 4 channel amp
  • 8 working speakers 

Series Connection 

Having a series connection is easy and safe. In this case, one of the speakers serves as the connection point for all other speakers. One speaker will be wired to the next one in a linear pattern. 

Step 1: Strip The Wires

Cut both the edge of the wires to remove about ½ inch of insulation of the wires with a wire stripper. This should expose the sections of the wire to make the connection easy.

Step 2: Fix The Positive Wire Of Speaker 1

Now, move the screw of terminal 1, of channel 1 to the anticlockwise direction. Put the red wire of speaker 1 into terminal one, to the positive option of the first channel.

Step 3: Fix The Negative Wire Of Speaker 2

Put the black wire of speaker 2 into terminal two, to the negative option of the first channel as you wired speaker 1.

Step 4: Connect Speaker One To Two

Now wire the negative terminal of speaker one to the positive terminal of speaker two. Tighten the screws and check the connection. Ensure the connection is secure and there are no loose wires.

Step 5: Connect Speakers 3&4, 5&6, And 7&8

Repeat the same procedure to connect the third and fourth speakers to channel 2, the fifth and sixth to channel 3, and the seventh and eighth speakers to channel 8. 

Parallel Connection 

If you understand the concept behind the parallel connection technique, it should be the easiest to execute. 

Most car owners prefer to use parallel connections when wiring two or more speakers to an amplifier. 

When speakers are wired in parallel, the ohms value of each one of them is divided by the total number of speakers in use to get the total impedance. For instance, if the 8 speakers each have an impedance of 4 ohms, the total impedance is 0.5 ohm. 

Follow the steps below to wire the speakers in parallel:

Step 1: Strip The Wires

Cut both the edge of the wires to remove about ½ inch of insulation of the wires with a wire stripper. This should expose the sections of the wire to make the connection easy.

Step 2: Connect The Negative Wires

Now, move the screw of terminal 1, of channel 1 to the anticlockwise direction. Put the black wire of speaker 1 into terminal two, to the negative option (Terminal B) of the amplifier. Then, connect the negative terminal of speaker 1 to the negative terminal of speaker 2.

Step 3: Connect The Positive Wires

Move the screw of terminal 2, of channel 1 to the anticlockwise direction. Put the red wire of speaker 1 into terminal 1, to the positive option (Terminal A) of the amplifier. Then, connect the positive terminal of speaker 1 to the positive terminal of speaker 2.

Tighten the screws and check the connection. Ensure the connection is secure and there are no loose wires.

Step 4: Connect Speakers 3&4, 5&6, And 7&8

Repeat steps 2 and 3 to connect the third and fourth speakers to channel 2, the fifth and sixth to channel 3, and the seventh and eighth speakers to channel 8. 

Pros Of Parallel connection

  • The process is effortless 
  • The sound quality is impressive 

Cons Of Parallel Connection

  • The overall impedance is significantly reduced, allowing the speakers to draw excessive power from the amp. This can cause overheating, primarily when the system is operated at very high volumes. 

FAQs 

What is the difference between a 2 channel amp and a 4 channel amp? 

A 2 channel amp allows connection with fewer speakers, while 4 channel amp will connect more speakers. 

What happens when you wire more speakers than the capacity of an amp?

Wiring more speakers to am amp increases the load. The amp’s temperature will, as a result, increase, and the amp can get ruined in the short or long time if it gets extremely hot. 

How do I test for a top-quality speaker?

The best way to test top quality is by paying attention to the frequency. If the speaker reproduces the frequency clearly without adding or removing detail, the speaker can be considered of excellent quality. 

Can I hook up 8-ohm speakers to a 4-ohm amplifier?

Yes, 8-ohm speakers can be used with a 4-ohm amplifier. In this case, two speakers are wired in parallel to each other to produce a total impedance of 4 ohms matching the amplifiers. 

Conclusion 

You now understand how to wire 8 speakers to a 4 channel amp. However, choose the method that gives you quality output and fully utilizes the materials you have without requiring that you adjust your budget. Another common wiring is to wire 6 speakers to your 4 channel amp. Check out this guide to learn more.