A lower-impedance rated speaker will require an amp with high voltage output capability, whereas speakers of higher impedances may need only nominal power so long as their wattage ratings are matched.
A 4 ohm speaker without a compatible amp will produce distortion and will not sound good and it could even damage the speaker, although most of them have some sort of protection against this. In a nutshell, the difference between these two types of speakers is their impedance and how it affects power consumption.
A speaker with a lower impedance will require more voltage for adequate sound levels, whereas one with higher impedance ratings may need only nominal power so long as they are matched wattage-wise to an amplifier.
One tank has a garden hose attached to it. The Other tank has a two inch diameter hose. The 8ohm speaker, like the garden hose, is a resistance to flow.
The bigger requirement can only be met by a bigger water tank, or an amplifier that is rated for 4ohm speakers. Halla said:. Thanks for adding more depth TLS guy. I was going to do all of the math, but it was late The issue is that the amp does not necessarily have to be more powerful to drive the 4 ohm speaker.
However the amp has to provide more current to the four ohm load so the output transistors have to be more robust. Now the power delivered is the square of the current X the resistance. The square root of 25 is 5 amps. So the amp has to deliver 5 amps to produce watts into 8 ohms. Now the voltage from ohms law is the current X the resistance which is 5 amps X 8 ohms which is 40 volts Now lets take the four ohm load. Which is 50, the square root gives a current of 7.
Now if the amp did not drop its voltage when driving the 4 ohm load then the power delivered is the square of the voltage divided by the resistance. Now you might say what is the difference. Well if the amp drops voltage supplying the four ohm load it is current limited. The transistors will be stressed and the amp will likely hit a hard clip and in the worst case scenario will clip at five amps, if that is its maximum current output.
If you do the above calculations that would be watts into 4 ohms. The point is that amplifiers that have to deliver more current require larger power supplies and bigger output devices.
It is the current output of the amp that has a bearing on cost. The maximum current output determines how much power an amp can deliver to a given load. The voltage an amp can deliver is determined by the operating voltage of the power transistors. Obviously the output voltage can not exceed that. This measurement is about how difficult it is to power the unit. It is essential to remember that this rating is only a baseline.
If you have an 8-ohm speaker at home that you use, the product will be at that level for only a small percentage of its active time because impedance varies based on what you play. An 8-ohm speaker might be at 5 ohms, 17 ohms, or even 41 ohms. It is all over the place because the frequencies drive that part of the equation.
When you want to compare 4-ohm vs. Most speakers end up having three significant peaks where the impedance levels tend to be the highest. The first is within the bass frequencies, typically somewhere between 20 Hz to 50 Hz. As the frequencies rise, the peak comes down until you reach the next set in the higher bass range. The third peak occurs around 2 kHz with many speakers. The only difference between the two involves the severity of the peaks if all other elements are identical.
Different power ratings can change those ohm spikes, causing the audio to sound tinny or unnatural because of where your ears sense the impedance. Yes you can. Basically if you play it too loud the speaker will draw too much current and you might blow the amplifier. While you can connect a mix of speakers with different ohm ratings, the best sound quality will come from equally rated speakers connected in pairs, such as two 8-ohm speakers connected to Speaker A on the amp or receiver and two 4-ohm speakers hooked up to Speaker B.
All speakers have an impedance rating in ohms, which represents how difficult the speaker is to power. The lower the impedance, the more efficiently it allows the electric signal, which is basically the music, to pass through the speaker.
A lower impedance speaker will accept more power. For example, a 4 ohm speaker will extract more power from your amplifier than a 8 ohm speaker, about twice as much. For most people, a 6-ohm or 8-ohm speaker is going to be the norm. Those types of speakers are particularly well-suited to match with the designs of most AV receivers. For a stereo pair of speakers, the amplifier should be rated at watts per channel into 8 ohms. If your amplifier is designed to drive a 4 ohm speakers, then 4 ohm speakers will play louder at the same power than 8 ohm speakers.
If your amplifier is designed to drive a 8 ohm speakers, then 8 ohm speakers will play louder at the same power than 4 ohm speakers. The main difference between 2 ohm and 4 ohm car speakers is the amount of energy they draw from the amplifier.
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