When wiring in series you are increasing the Ohm load by hopping from one voice coil to the next. So an example of a series circuit can be viewed below. Just remember wiring in series it is used to INCREASE the Ohm load and parallel is used to DECREASE the Ohm load. Lets look at each example before we figure out exactly how to wire our amplifier example from above. There are two terms that you will need to know when wiring subs or speakers, Parallel and Series. So how do we do that? This is where things tend to get a little trickier however it is not as hard as it may seem. Using the same amplifier ratings from above we now know that we want to wire the amp at a 2 Ohm load. Next we will look at subwoofers and how to wire them properly to the amplifier. Every time an Ohm load is multiplied by 2 the current will be cut by half. Every time an Ohm load is divided by 2 the current will double in amperage. The larger pipe above would represent a 2 Ohm load whereas the smaller pipe would be 4 Ohm. Now if you look at my diagram above you can really see how it works. Most amplifiers have a thermal protection circuit however, it is still possible to damage the amplifier. You would not want to run this amplifier lower than a 2 Ohm load otherwise you can potentially burn it up since it would be running at twice the recommended power rating and capabilities. To get the maximum output out of the amplifier rating listed above you want to make sure it is wired at a 2 Ohm load, running the same amplifier at a 4 Ohm load will result in a 50% loss in potential power. Now this is really important when purchasing equipment. All amplifiers will feature a rating which will usually look something like this. ![]() In a car audio you should always run your equipment at the lowest possible Ohm load that an amplifier, head unit or speaker can safely handle. You need to know the ohms of all of your speakers if you want to calculate the load your amp is taking and to compensate for it. An 8 ohm speaker requires more amperage to run than a 4 ohm speaker. The less energy, the more you get out of your amps. The lower the ohms the less energy it takes to drive the speaker. Good luck.The ohm is a measurement of the electric resistance between two points. If that's the case, you could either run the subs wired to each channel, or connect them in series and run them bridged. So, from what you told me, you may have one of the above conditions. If the terminals are in parallel with an ohm meter. Speaker terminals on the amplifier, we actually have a 1 ohm load. So, if we connect 2 speakers to each pair of Positives together 2 negatives together). Speaker terminals inside the amp are connected together in a parallel configuration (2 That you can connect 2 speakers to each pair of speaker terminals. Now, when we look at the mono amplifierĪmp with 4 speaker terminals (the same number as the stereo amplifier), you might think Simply connect 2 speakers to each channel. If we want to run all 4 speakers on the stereo amplifier, we would Let's say that we have fourĤ ohm speakers. Lets compare a stereo amplifier capable of driving a 2 ohm load on eachĬhannel to a mono amplifier capable of driving a 2 ohm load. Many mono amplifiers have 4 speaker output terminals (two positives and two Generally going to be able to drive only a 4 ohm (or higher) load when bridged. This doesn't mean itĬan drive a two ohm load when the amplifier is bridged. Generally means that it can drive a two ohm load with each channel. ![]() When a multi-channel amplifier (2 or more channels) says it's two ohm stable, this See these two blurbs I copied from the Basic Auto Electronics website: ![]() (again leaving neg 1 and pos 2 on the amp unconnected), the speakers receive 120 watts and theĪmp still sees the parallel impedance of 2 ohms.īut again, your amp MUST be capable of being bridged, AND be stable at 2 ohms whenīridged, AND THIS IS NOT ALWAYS THE CASE! If you take the negative leads from the speakers andĭisconnect them from the negative of channel 1 and connect them to the negative of channel 2 Speakers to the pos of channel 1, and the negative leads of both speakers to the neg input ofĬhannel 1, the speakers would receive 60 watts, and the amp would see a resistance of 2 ohms, as Now, if you take two speakers, 4 ohm impedance each, and you wire the positive leads from both The speaker will now be receiving 120 watts (approximately), but the amp will still If you wire the pos of the speaker to the pos on ch 1, and the negįrom the speaker to the neg of ch 2 (the neg of ch1 and the pos of ch 2 aren't connected toĪnything). Let's say your amp is a 2 channel, 60 watts perĬhannel, and it can be bridged. To pos and neg to neg), and it's a 4 ohm speaker. Let's say you have one speaker wired to channel 1 (pos Bridging doesn't change the impedance (On a Stereo Amp).
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