Originally Posted by bluedvl11
Oooookkkk. Pretend your talking to a retard. Does less mean 10 ohms or 6 ohms?
Here is an article that should help you understand better. the simple answer is Less would be 6 ohms.
Okay. Every now and then I see questions regarding speaker impedance and the importance of matching loads with what your amp has been designed for.
In this article I intend to explain what impedance technically is, why it is important, and how it is calculated.What Is Impedance?
Impedance is the resistance that an electrical component, such as a speaker, offers to the flow of current. It is measured in Ohms. It restricts the current flow within a circuit to a specific amount at a specific frequency. This component is commonly known as a Load.
Now to put that into context. An amplifier puts out a large amount of current (measured in Amps) that is intended to move the speaker coil and generate sound waves. An amplifier would have been designed to produce a specific amount of power (measured in Watts) through a load with an impedance of commonly 4 or 8 ohms.Why Is It Important?
The lower the impedance of the load, the greater the current flow will be. Too little resistance, however, will result in too much current passing through the output circuitry and which may cause damage to the amplifier. This being the case, it is always important that you do not use your amp with the impedance of the load less than that of which your amplifier has been designed for.
Running a load of greater impedance will not cause any damage to your amp, however you wll experience some loss of power and therefore perhaps a slight drop in volume.
Another thing that needs consideration is the fact that some amplifiers have more leniency towards impedance mismatching than others. So it’ll always be a good idea to read your manual or ask a tech to confirm what your amplifier can or cannot do.How It Is Calculated?
Every electrical component has a resistance, and these all come in a very wide range of values. Amplifier speakers are usually made to have an impedance of 4, 8 or 16 ohms. Which, thankfully, keeps it simple.
So, say for example you've got yourself a 50watt amp designed for no less than an 8ohm load, and an 8ohm 50watt speaker. Well that'll be simple, just plug 'em together.
But what if you want to use multiple speakers? Or what if all you've got is a 4ohm speaker? Now here you will need to do a bit of calculating and re-wiring of your own to ensure you match the impedance as closely as possible in order to prevent possible damage to your amplifier.
And to do that you'd use that handy little life skill of yours known as maths.Series and Parallel
To explain further, firstly I must explain the difference between Series and Parallel circuits.
When components are in series it means that they have been wired end to end, so that the current will flow through each component one after the other. Each component in the series will have an added effect on the total amount of resistance that the circuit will have.
When components are wired in parallel the current is split into multiple paths and flows through each component individually. But now that there are multiple paths in which the current can flow, the resulting resistance within one section of the circuit will have significantly less of an effect on the total amount of resistance within the entire circuit. The more components wired in parallel there are, the more number of paths there will be and therefore the less total amount resistance there will be.
Got that? Yes? No? Doesn't really matter. Hopefully the maths will help explain it.When Wired In Series
When multiple components are wired together in series the total resistance will equal the sum of the resistance of each component.
So two 4 ohm speakers wired in series would have a total impedance of 8 ohms. (4 + 4 = 8).
One 4 ohm speaker and one 8 ohm speaker wired in series would have a total impedance of 12 ohms (4 + 8 = 12).
One 8ohm speaker and two 4ohm resistors wired in series will have a total impedance of 16 ohms (8 + 4 + 4 = 16).
So the formula for this would be: R1 + R2 + R3 + ... = RtWhen Wired in Parallel
Just like in my above explanation, parallel is a little bit more complicated. Here the reciprocal of the total resistance is equal to the sum of the reciprocals of the resistance of each component in the circuit.
The formula for this would be: (1/R1) + (1/R2) + (1/R3) +... = (1/Rt)
So two 8 ohm speakers wired in parallel with have a total impedance of 4 ohms (1/8 + 1/8 = (1/0.25), Rt = 4 ).
Three 8 ohm speakers wired in parallel will have a total impedance of 2.6 ohms (1/8 + 1/8 + 1/8 = (1/0.375), Rt = 2.6).
Four 8 ohm speakers in parallel will have a total impedance of 2 ohms (1/8 + 1/8 + 1/8 + 1/8 = (1/.5), Rt = 2)A Couple More Examples
A quad box has been wired in series-parallel, two lots of two 8ohm speakers (that have been wired in parallel) are both wired together in series. This cab will have a total impedance of 8ohms.
A fold back wedge has in it an 8ohm speaker wired in parallel to a 180ohm Piezio tweeter. This will have a total impedance so close to 8ohms that it wouldn’t harm your amp at all if you ran it at just that little bit less.Conclusion
Okay yeah, it does get kind of hard to follow there. But it will be definitely worth your while to keep these formulas in mind, as one day they could come in handy.
If you still need further explanation it would be best if you read up a bit about Ohms law so that you gain an understanding of the relationship between Current, Resistance and Voltage. Google for that.
Thanks for reading. Cheers.