With the same power delivered to each, a 4 ohm speaker and identical 2 ohm speaker will produce the same amount of volume. The reason why you get the best results with a 2 ohm or 4 ohm subwoofer matched to your amp is due to the relationship between voltage, power, current, and resistance.
When combined and re-arranged we have a simple formula we can use to calculate power to an electrical resistive load like a speaker. The more voltage that can be output, the more current that be sent and therefore more power and louder sound.
The issue is that each device radio, amplifier, etc. Estimated wait for next available agent :. For Tech Support, call I belong to a culture of fine sights and sounds, and I like spreading the word. I've been tinkering with electronics ever since I was a kid - starting with taking apart and putting back together televisions and radios. I always got them back together again and working. I took courses in radio and electronics as a teenager, and became a ham radio operator.
I worked in my high school's stage crew, running sound, lights, and a movie projector. After college, I joined a rock 'n roll band as the soundman and learned how to lug around and operate the gear that helps make music sound good and loud. Working in a music store in Austin, Texas, I spent a few years manufacturing, installing, repairing, and operating sound systems.
Our customers were recording studios, nightclubs, and touring bands. Eventually I moved back to Charlottesville, Virginia and opened a small demo recording studio. In , I finally came to my senses and got this job at Crutchfield. They actually pay me to ramble on, rant, and explain the things I love about music, electronics, and getting good sound. Given my background, they put me to work writing about some of the most complex electronic products Crutchfield sells: car amplifiers, digital signal processors, wiring, professional sound mixers, and PA systems.
Confusion concerning watts, amps, and ohms has been around for as long as people have been putting subwoofers in cars.
Watts and ohms are entangled in a series of mathematical formulas that link them intimately together such that when one of them undergoes a change in value, the other often does too. Amplifiers provide the electrical pressure in a circuit; ohms measure the resistance, or load, against that pressure; and watts measure how much power is released as work. So, using one of those math formulas, an amplifier that provides watts of power through a 4-ohm speaker, will produce watts through a 2-ohm speaker, because it's easier to push that reduced load.
At the heart of every speaker and sub is a voice coil. This is the device that puts up the electrical resistance and performs the work.
The amplifier provides the power. The resisting property of a coil is called its impedance and is measured in ohms. The lower a speaker's impedance, the easier it is for an amp to supply power to it. Problems arise when the amp's output meets very little resistance low impedance and it tries to put out more power than it was designed to produce. This leads to the amplifier overheating and then, hopefully, shutting down to protect itself from burning up.
So the capability of an amplifier has to be considered before applying a load to it hooking up a speaker. The manufacturer's specifications indicate an amp's minimum impedance requirements. Almost all amps can drive a 4-ohm load. Most amps can work with 2-ohm loads on each channel, but not when the channels are bridged together.
Some amps can drive a load as low as one ohm. The two channels of this Pioneer GM-A amp can be bridged by wiring the subas indicated. To add to the confusion, in multiple-sub systems, the total impedance depends on how the subs and their voice coils are wired together — in parallel or in series. Parallel wiring means that the connection ends of each device are connected to the same things — plus to plus, and minus to minus. Series wiring means that the devices are wired one after the other — a plus of one to a minus of another.
When speakers or voice coils are wired in series, you add their impedances together to find their total impedance. Two 4-ohm speakers wired in series have a total impedance of 8 ohms. When speakers or coils are wired in parallel, however, the formula for their total impedance is more complicated. When the impedances of all the devices are the same, their total impedance, when wired in parallel, is that impedance value divided by the number of devices. For example: four 4-ohm speakers wired in parallel have a total impedance of 1 ohm.
This Rockford Fosgate DVC 2-ohm sub has a built-in jumper so you can choose whether it has a 1-ohm or a 4-ohm total impedance. Subwoofer manufacturers make subs with dual voice coils DVC to take advantage of this difference in wiring schemes, so the user has more freedom of system design. A DVC 4-ohm sub can be wired into a system as a 2-ohm or as an 8-ohm load.
A DVC 2-ohm sub can have a total impedance of 1 ohm or 4 ohms. If I wanted 4 subs in a system, I might consider using 4 DVC 2-ohm subs, each with their voice coils wired in parallel to make them each 1 ohm subs, and then wire the 4 of them in series so my amplifier could drive them as a single 4-ohm load. Or, I could wire the voice coils in series, making them all 4-ohm subs, and then wire the subs in parallel so the amp would see the total load as one ohm.
It would depend on my particular amplifier — which load it would do the best with. To make subwoofers sound their best, they should be powered by an amp whose RMS output rating comes close to or even slightly exceeds the total of all the subs' top RMS ratings. If you want to run three subs whose RMS ratings are watts each, you'll need about watts RMS of power to run them.
Underpowered subs won't sound good or play very loud. Then, if you were to turn up the input to compensate, the amp could end up sending out clipped or distorted signals that could damage the subs. It's okay to overpower your subs a little bit, as long as the signal's distortion-free, because they're made to withstand occasional peaks well beyond their normal RMS rating. The sub and amp you need depends on what you want to hear.
If you plan on listening to music at moderate volume levels or have a smaller car, a subwoofer with a lower power handling rating, say to watts, and a matching amp is a good combo. The ultimate goal is to have the amp send its full power to subs that can handle it. The object of using different wiring options to optimize the impedance is to get the most power out of the particular amp and subs you have at hand.
For more wiring specifics, check out our subwoofer wiring diagrams. If you want to get right into choosing a subwoofer, take a look at our top-rated and best-selling subs. The amp that I'm looking at is a 1, watt amp. Conservatively rated at 1, watts RMS power at a 1-ohm load, with the capabilities of reaching beyond 1, watts at max power output. Would this be a good amp to power both subs? If so, can I connect a pair of 1 inch tweeters to offset the remaining power being given from amp to speaker?
What else if any can I connect to the amp and use its maximum power? I can wire the subs down to 2 ohm correct? I would like to know if I have a 12" dvc subwoofer rated for watts rms at 4 ohms, will the rms watts changed when it is then wired in parallel to push 2 ohms?
Or does the rms watts always stay the same wether it gets wired at 2 ohms or 8 ohm? I got 2 jl audio 12w v2-d4 with rms each and a memphis mcd at 2 ohms is rms is this a good set up and if so whats the best way to wire them up? I have a Kia Soul with a all 4 ohm Rockford Fosgate door speakers, which replaced 4 ohm factory speakers. Same factory head unit. Will the fact that this sub is 2 ohms clash with my setup? I would like to start by saying cruthfield is on OG status and l always learn something new when l search for information.
Now lets get into the dish Will this all work together? Are there any glaring issues with this that would be damaging to any of these components? If so is there a way to minimize the risk or make it work together using all of these components? I just got off the phone with one of your reps and was told that a 4 ohm sub RF P3d could only be wired to 1 or 4 ohm and I wanted it to be wired to 2 ohms. I am currently running two mtx on a taramps smart 3k.
I'm considering getting them reconed with upgraded parts but they told me the only coils they have available for it are dual 1 ohm coils instead of 4ohm. How would that effect the sound and power handling of my subs? Our subwoofer shopping guide will help you determine which kind of subwoofer and bass system you need, to get the sound you want. There is also a difference of about 2. The difference between 2 ohm and 4 ohm subwoofers is not great and they will produce a similar quality of sound if run in the same wattage.
Watts and ohms are all part of a series of mathematical formulas that put them together such that when one of them changes in value, the other often does too.
What is the power difference between ohms? What percentage of added power is there? Does it change with different ohms? Will running the 4 ohm single voice coil sub on a 2 ohm amp be related to my problem? Amplifiers usually output power based on the impedance of the sub. So if the sub is 2ohms and the Amplifier is rated for watts if you connect a 4ohm sub it will output watts to the sub.
But it is not an issue. There is only a problem if you connect a sub with lower ohms like 1 ohm, then the amp will start to heat up. I upgraded a little I had anew planet audio head unit the bells and whistles are there great price so I got a Rovkford fosgate rx5 and 4 6. I am looking to purchase a Rockford Fosgate Tbd and 2 fosgate p not sure if I should go with 2ohm or 4 ohm subs? I will be putting this setup in a fox acoustics dqc v box under the rear seat of my ram quad cab.
Please help. I was wanting to do infinity kappa series however a friend of mine said I should do fosgate power series any suggestions? These will be powered by a fosgate t Thanks for your time and effort in helping me resolve this audio build delema. Actually, from an engineering perspective the author is looking at it from the most basic of calculations.
Most of the time units with extremely low load resistances are horribly inefficient with the audio signal that is supplied.
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