Ohm is the speaker and Recipient Manufacturers use to let you know their performance. Speakers and amplifiers are usually rated at 8 ohms, but not always. For example, if your receiver has a rating of 6, does it mean you can’t connect an 8 ohm speaker? For this, what is ohm?
While technically, while impedance is indeed important, it’s not as good as saying: “A speaker with an X-impedance can only be connected to a receiver with an impedance.” In fact, unless you buy some rare or very strange speakers, the vast majority of people can work with any modern receiver. I’ll try to explain all of this as simply as possible, because the technical answer to “ohm is the unit of resistance” is not particularly useful to anyone in the field of high school science right now.
What is ohm?
I won’t judge anyone’s settings, but it’s usually better to have a chair on the speaker.
Ohm is the unit of resistance. just kidding. OK, but that’s the way it’s most relevant to amplifying the sound. There is at least one speaker, usually several drivers. These drivers are usually magnets attached to moving materials. It produces sound when the material moves or vibrates in the air. The electric field that causes this movement is created by the amplifier. The difficulty in moving the driver or driver is the part that constitutes the speaker’s impedance, which is rated ohms.
The vast majority of spokespersons on the market today have a rating of about 8 ohms around 8 ohms, although you can find some ratings as low as 4 ohms. Speakers below 4 ohms or above 8 ohms are rare and are usually used in the high-end.
Why doesn’t matter (mainly)
Impedance rating is basically useless. There is no speaker’s same impedance at all frequencies. If one rating is “8 Ohms”, it can be at 1k, 500hz, 20k or in fact in any frequency. No regulations believe that ratings must be performed at a specific frequency. The manufacturer says “8 Ohm” because that’s what people expect. Is this the average of a series of frequencies? Depending on the speaker’s design, the impedance of any frequency can vary between 2 and 8 ohms, and can even reach up to 40 ohms! This rating is almost always average.
This “nominal” range is also something that most receivers or amplifiers are designed for power supplies. That’s why most people also list their power ratings as 8 ohms (i.e. “100 watts at 8 ohms”), but if the speakers are below this, most will not have problems. If you want to run a 4 ohm speaker from a rated 8 ohm receiver, the most likely result is that it will run hotter. It requires harder to provide the speaker with the strength it needs.
Will cheap amplifiers have problems with speakers with lower impedance? Yes, but generally speaking, inexpensive speakers that you usually pair with cheap amps are very easy to drive. Why would anyone pair a hard-to-drive speaker with a cheap amp? At best, at least for skilled products, if the amplifier drives too much, it will just turn off. This is called “hidden protection” and unless it’s a particularly bad design, all you need to do is reopen it again. The reason this pairing is not a good idea is due to this worst case scenario: something in the chain can blow in and cause terrible damage – whether it’s to the amplifier, speakers, or even worse, your hearing. The general rule of thumb for CNET is to be the same on an amplifier as you are on a pair of stereo speakers.
It is worth noting that many companies selling spokespersons with lower impedances will often explicitly say “compatible with 4, 6 or 8 ohm rated amplifiers.” On the other side of the price spectrum, many Indoor Indoor Indoor System (Remember those?) The impedance is very low. These are designed to take into account specific amplifiers that are performed in the box, pairing allows the company to do some creative marketing. As I explained at the end, a 2 ohm amplifier rated at 100 watts can actually only 25 watts to 8 ohms. Does the side of the box look better?
exception
OK, I want to judge this. The center channel is too high and not even tilted. The rear speakers are in the front (absolutely profane). All I can only assume is the second center channel, which is a board laser. There are just a lot of weirdness here.
With the vast majority of speakers, receivers and amplifiers will work interchangeably. Of course, they will! Manufacturers usually want the widest audience, so they don’t design products that don’t fit most of them.
However, there are some spokespersons in the market that only require a lot of amplification. These hard-to-drive speakers usually have low impedance and require a lot of amplifiers. Power is an important component in any amplifier and must provide sufficient power to the starving speaker. Just like no one is trying to drag a trailer with a lightweight, hard-to-drive speaker, it requires a decent amplifier.
These are not the speakers you find in Best Buy, and if you are in a store that sells these high-end speakers, then the salesperson may also talk to you about using an amplifier with them (as they should).
OK, now some math
If the speaker has a lower impedance, more current needs to be required at the same voltage. That is, if you cut the amount of ohms in half, you need twice the amount of power. So if an 8 ohm speaker requires a specific volume of 100 watts, a 4 ohm speaker will require 200 watts to produce the same volume (watts = Amps x volts). Can a decent amplifier do it? certainly. Can cheap amplifiers do it? perhaps. Interestingly, many high-end amplifier manufacturers actually boast about it. They will rate the amplifier for example “200 watts, 8 ohms and 400 watts, 4 ohms, respectively”. This shows that the components of the amplifier are powerful enough to handle anything the speaker needs.
Should you care? Unless your speaker or the speaker you are considering is particularly difficult to drive and You are trying to power them with cheap or insufficient amplifiers and You are exploding in large quantities, then no. Most mainstream speakers are powered by almost all mainstream receivers and amplifiers. They are all designed to do this.
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