How to Use Crate Power Block With One 4 Ohm Speaker – Quick Guide

Consider the following scenario: you want to combine a 4-ohm speaker with a 100-watt-per-channel home receiver with an 8-ohm minimum resistive rating. By connecting a 4-ohm power block in series with the other power blocks, it is feasible to increase the overall resistance (measured in Ohms as the speaker load) to the comfortable limit of 8. Each speaker receives just half of the total power supplied due to linking the speakers in series with a power block.

In this article, I’ll show you how to tune (or match) the impedances of your speakers with the use of power blocks.

The following are some of the downsides of altering the impedance of a speaker with power blocks: Know what kind of power blocks you’ll need to get started, and what to do if you can’t find the particular power blocks you’re looking for (there are several intelligent workarounds for this).

Using a power block with a speaker too with a 4-ohm speaker

how to use crate poweblock with one 4 ohm speaker

It is common for impedance to cause problems with a stereo or amplifier when the wrong voice is used. Power blocks can be used with speaker matching capacitors to accurately match and adjust the impedance that an amplifier or stereo senses.

Using a power block to make a 4-ohm loadFunctionsEssential products
When a speaker with a higher impedance rating is required To acquire the necessary ohms value, Check the power block from Amazon
In situations where a speaker with a lower impedance is required It assists in obtaining a lower value8-ohm amplifier 4-ohm speaker
To achieve the necessary ohms.To assist in determining the exact values of power blocks. 

1. A lower impedance speaker should be used in the same situation when a higher impedance speaker is needed

Install a power block in series with a speaker to enhance the speaker’s impedance and acquire the ohms value required by the amplifier.

If you want to know the power block I use, check this from Amazon.

2. When a lower impedance speaker is needed, a higher impedance speaker should be used instead

It is possible to use a higher impedance speaker in places where a lower value is required by connecting two power blocks in series. An excellent example of this is using an 8-ohm amplifier with a speaker crossover designed to work only with 4-ohm speakers.

Check the 8-ohm amplifier from Amazon.

3. You can use as many power blocks as you need to achieve the desired ohms value

If you cannot locate the exact values of the power blocks you require, you can combine several power block values to achieve the total value you need. This is effective as long as they can withstand the current of electricity flowing through them.

Power blocks can be used in various ways to modify speaker impedance

Power blocks can be used in various ways to modify speaker impedance

Use a speaker with a lower impedance than you would normally get away with using an amplifier or audio system to deliver the sound you want. When a lower impedance speaker is required, an impedance speaker with a higher impedance is employed.

It is much less common than the first scenario to encounter the second one. While using speakers with crossovers and in a few other situations that you may come across, this feature is extremely beneficial. If you want to use a speaker with a higher impedance than the one required by a stereo or amplifier, this is usually not a problem to solve. It is safe to use a stereo or amplifier as long as the speaker impedance is equal to or greater than the minimum Ohms rating of the device.

Increasing the total speaker impedance by using a power block

Increasing the total speaker impedance by using a power block

If you intend to use a speaker with a lower impedance, you can use series power blocks to increase the total impedance that the stereo or amplifier perceives. However, this method is not recommended. You can safely prevent overheating and burning out of the devices you connect to by employing this method.

What you’ll require is as follows:             

Increase the speaker’s impedance by connecting a power block with the appropriate resistance (Ohms) value and with at least half the power rating of the stereo’s or amplifier’s power output rating to the speaker circuit. In the case of a stereo system that produces 50W per channel, a power block with a value of 25W or higher would be appropriate.

To avoid shorting to speaker wire or other metal components, the electrical tape should cover any open power block leads. When working with speakers or power blocks, ensure that the cables are completely covered and not left exposed.

It is possible to effectively double or triple the impedance of your speaker by connecting power blocks in series with one another.

Using a power block, you can lower the total speaker impedance

Using a power block, you can lower the total speaker impedance

Using an amplifier or receiver in conjunction with a speaker, you can not only increase speaker impedance, but you can also efficiently reduce speaker impedance. There are a few circumstances in which understanding how to accomplish this comes in helpful, despite the fact that it is not something you will encounter very often, such as:

To match different speakers, speaker crossovers with varying impedances are used. Until you can find replacements for the original speakers, you can do additional speakers as a temporary solution.

  • Replace obsolete speakers with the next best ones you can find; however, make sure they have the same impedance as the previous ones before proceeding.
  • Thanks to the fact that you took advantage of lower-priced speakers, you have obtained a fantastic deal.
  • Putting power blocks in series can help to lessen the overall speaker load seen in this circumstance.


Contrary to popular belief, speakers and power blocks are not the same. Because of capacitance and how the alternating current musical signal impacts the voice coil, their impedance fluctuates depending on the sound frequency they are playing at different times.

The addition of a power block, as a result, can have a slight effect on the sound, causing a speaker to act differently across the entire range of sound frequencies.

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