How to you make the impedance calculation? - Office Equipment & Supplies

yes. google, impedance calculator and it will help you out on how to wire it

All power amplifiers are designed to operate with a maximum current. This is limited by a minimum speaker impedance load. Your amplifier manual will specify the minimum load on output channels. High quality amplifiers can drive speakers with a combined impedance of 2 ohms or less. To calculate your parallel load, as you have requested, use the following formula. 1/Total load = 1/mgongo speaker impedance + 1/HW-E5500 speaker impedance.
Example. If your mgongo speakers have a nominal impedance of 8 ohms and the HW-E550 speakers have a nominal impedance of 8 ohms, then the formula is 1/Answer=1/8 + 1/8
1/Answer = 2/8
1/Answer = 1/4
Answer = 4.
If your amplifier can drive a 4 ohm speaker load without clipping then you are OK.

This is based on MOST cabinets like this: First look for any small screws which are usually through the grille near the top and bottom that retain the grille. When those are removed, one has to pry the grille out of the grooves at the side by dishing the grill outward at the center so edges come inward. There often is a "U" shaped rubber strip along the edges that will need to be put back on before grille is dished and put back.

Note that SOME speakers have a fuse or a polyfuse to protect them from excessive current. If yours do not, consider puttin in polyfuses to protect them. They are available from Digikey.com.

Calculate the hold current based on the pwer rating and impedance. Take the square root of the rated power of the HF divided by the impedance and choose aa polyfuse that will hold that current and one that will standoff the peak voltage of your amps. Calculate that voltage as the square root of the max power of your amp divided by the LOWEST impedance allowed for the amp.

http://search.digikey.com/scripts/DkSearch/dksus.dll?lang=en&site=US&WT.z_homepage_link=hp_go_button&KeyWords=polyfuse

Set the filter to search for "Radial" type package and find suitable rating in the list that comes up.

I am not familiar with "I7 15" but will assume it is a speaker. Please correct me if I am wrong. As for the amp setup:
The amp output impedance is not adjustable. The amp is rated at 1 ohm which means you can connect any amount of speakers onto the output as long as the sum total of the load you connect to the amp is not less than 1 ohm.
Speaker impedance is also not adjustable but the total load connected to an amp can be altered by altering the way the speakers are connected to the amp.
The formula for calculating impedance looks very complicated but is quite simple.
First you have to understand the difference between series and parallel connections.
See diagram.
Series: Connecting 2 or more speakers by using the negative on one speaker connected to the positive on the next speaker.
Parallel ( // ) : Connecting the positive of a speaker to the positive of the next and the negative of the speaker to the negative of the next.

Connecting speakers in series is handy when you have two 500 watt speakers for instance and want to run them off an 1000 watt amp. Connecting them in series will assure that you dont over power the speaker and damage it. When connecting speakers in series the total of the impedance of the speakers is the impedance of each individual speaker added together. In our example the total impedance will be 2+2+4=8ohm
The parallel connection impedance calculation is a bit more complex.
1/Rtotal = 1/R1 + 1/R2 + 1/R2
1/Rtotal = 1/2 + 1/2 + 1/4
Rtotal = 0.8 ohm

If you have Microsoft Excel installed in your computer you can enter the following formulae as shown into the spreadsheet. After entering the formulae you must enter the values of the speakers into fields A2, B2 and C2 and it will calculate the total impedance for you.
Using less speakers just remove C2 from the formula.
Using more speakers add for instance D2 into the formula
For your specific amp make sure the load you connect is not less than 1 ohm. It is safe to connect more than that but using less will result in the amp protection circuitry to be activated.
If you use one speaker only then there is no adjustment to be made.
Your particular amp can also connect to an additional amp( and speaker) by using the "PASS-THRU" connectors. This saves you from using an additional set of signal wires from the head unit.
I hope that you now have a better understanding of amp wiring.
If you like you can leave a comment with the specs of the speakers you want to use (wattage and impedance) and I will draw up a diagram for you to use when wiring the system.

Let me address the wiring kit first. No the higher wattage kit is not a problem however you will need to change the inline fuse to an amperage that is more suitable for 250 Watts. The amps main fuse will be able to protect the power supply but no need to have a larger fuse than needed.

Now lets talk about the fuse. First off what kind of amp is it? Just for my knowledge. What is the rated impedance that amp can drive bridged mono or stereo (however you have connected it) If the total impedance presented by the woofers is lower than what the amp can drive the amplifiers power supply will demand more current than is designed for. I guess what I need to know is the model of speaker, model of amplifier and size of the inline fuse (right next to battery). Initial diagnosis would say the load on the amp is too large.

Rule of thumb for calculating impedance. The easy way if you have two or more characteristic impedance that are equal then you can add them and divide by the number of impedance to get your total Load however the formula is as follows,

1/((1/Z1)+(1/Z2)+(1/Z3)+(1/Z4)) or (Z1^-1 +Z2^-1+Z3^-1+Z4^-1)^-1
(They are the same thing, just written differently)

In electrical terms Z is your impedance, the negative exponent just means reciprocal.

So in your case if you have 2 dual voice coil subwoofers with a 4 ohm per coil impedance. If you parallel the two coils you would have a 2 ohm impedance. Then if you parallel the two woofers you would have a 1 ohm impedance. This is to low of a load for your amp to drive.

Let me know

Either you are putting in partially discharged batteries (test the new batteries with a battery tested NOT a voltmeter), or there is a partial short in the ca;culator (low impedance). If he batteries test good before insertion and they drain very quickly upon use, then the calculator is defective (it has some sort of low impedance in the circuitry. In this case, complain to Texas Instruments and have them give you a new calculator.

Your speakers may be underpowered by your receiver. Check the watts and impedance of the speakers, and the wattage of your receiver to make sure they closely match. (impedance is calculated in ohms- indicated by an omega symbol written near the wattage rating)
"Overload" may also mean that the amp went into protect mode, and that means that you're OVER-powering your speakers and it wants to protect them from damage due to impedance mismatch.
But- if the impedance and wattage match between the speaker and the receiver/amp, you should check the polarity of the speaker cables (+/-) BTW- never put 2 speakers in 1 output- that will almost always cause something like this and will sound bad.
I hope this helps.

Digital scales purport to measure your body fat through a process called BIA, or bioelectrical impedance analysis. Essentially, it clocks the speed that electricity travels through you. The scale runs a low-level electric current through your body, using your feet as positive and negative electrodes. The current encounters different levels of impedance, or resistance, from fat versus muscle. The scale measures this impedance, and throws it together with other factors (age, sex, height) to come up with your BMI, or body mass index.

Whether you should run them series or parallel depends on the ohms of the speakers and the rating of the amp. If the amp rating is 2 ohms and the speaker are 4 each, then you can run parallel. When you connect speakers in parallel, the total impedance (ohms) is calculated by dividing the impedance of one speaker by the number of speakers, assuming they're all the same. When in series, add the speaker impedances together (i.e. 2 speakers 4 ohms each=8 ohms) Going over the amp rating doesn't hurt anything but the level of sound, but when you go below it, you'll eventually burn out the amp.

Hope this helps, and please rate my advice.
Thank you, and good luck!!