Since your car has a lower voltage, the speakers will need less resistance to get the amount of power necessary. An amplifier that can deliver 50 watts of power at 8 ohms will be able to deliver 75 or watts of power at 4 ohms because the current is less restricted.
Because of this, most companies design car amplifiers explicitly for 4-ohm speakers. As you might expect, the opposite reasoning is true of your home speakers. Since your home outlets offer a much higher voltage, it needs a smaller percentage of that to be passed along to the speaker and is likely to have a higher impedance rating.
There are 4-ohm home theater speakers out there, but it is rare for car speakers to have a higher impedance than 4 ohms. The most obvious difference between car subwoofers and the ones used for home theaters is the size. Not only does the cabinet size of the speaker make room for a more powerful subwoofer, but it is also necessary if a subwoofer is going to be active.
An active subwoofer is a subwoofer that has an internal amplifier built in. It does not need to rely on the stereo amplifier for power, and therefore has a lot of flexibility and can be a lot more powerful. Active subwoofers, since they have their own amplifier, also need their own power source. The easiest way to tell if your home theater subwoofer is active is by determining if it needs to be plugged into a power outlet. Passive subwoofers only need to be plugged into the amp.
Active subwoofers require a wall outlet. As you might imagine, the subwoofer in your car is going to be passive — unless you really put the effort forth for something active. The size difference also creates a difference in efficiency between the two subwoofers. The subwoofer in your home is designed to move a lot of air and produce sound for a large area. The subwoofer in your car is designed to fill the vehicle cabin with sound, which is a much smaller space.
Manufacturers design Car speakers for an entirely different environment than home speakers — in more ways than one. A single woofer of eight ohms or with dual four ohm voice coils will also give the needed load. You can also choose to use a dedicated subwoofer amplifier. These are relatively inexpensive and have built in subwoofer filters in most cases.
In general, they also deliver more power into four ohms and can be used with a single four ohm woofer other combinations are possible.
Electronic pieces are a little trickier. They require that the volts AC from the wall be converted to 12 volts DC. For smaller devices like head units you can probably use a bench power supply that delivers amps DC. They are available from Parts Express and other sources.
These are usually the kind you will need since most questions I receive on this topic involve running car audio amplifiers in a home stereo setup.
The largest you are likely to see is 40 amps continuous so don't plan to use too large of a setup. Plug an RCA plug into the home speaker. Connect the positive RCA plug wire to the positive automobile speaker wire. Then connect the negative RCA plug wire to the negative automobile speaker wire. Turn on the system and listen to the sound coming out of each speaker to verify everything is working.
William Kinsey lives in Concord, N. When an amplifier is designed for 8-ohm speakers, then 4-ohm speakers might result in cranking the volume all the way up to get decent sound. You can double up and connect two 4-ohm speakers to a single 8-ohm terminal to create 8-ohms of resistance. This will not necessarily give you better results than an 8-ohm speaker.
You could — in theory- wire a home audio subwoofer into a car. The process is difficult, and not recommended unless you are incredibly knowledgeable about electronics and wiring. Whether or not the process would actually work would depend on the capabilities of the amplifier and stereo system in your car, and the exact subwoofer you are using.
Attempting to wire an active home subwoofer into your cars stereo system, for example, is much more dangerous. Because active subwoofers require their own power source, you would need to find a way to connect the subwoofer to the battery.
Connecting it directly to any source output on the amplifier alone would not be enough. I highly recommend that you choose a subwoofer designed for a vehicle instead of attempting to modify a home subwoofer.
They are designed to be compatible and look great in your car. This active subwoofer from Rockville is a great, low profile example. The reasoning and consequences of these differences are nuanced, so you should take a closer look at each to understand why they exist. Thanks for the nice article. Please keep it up. Please stay informed like this. Thank you for sharing. You may find more details here. Can I use 2 different active crossovers on one monoblock amp..
Some other key differences between car and home speakers are: The system in your car is going to be subject to harsh environmental factors. The power source in your car is very different than the power source in your home. The speakers in your car need to fill significantly less space than the ones in your home.
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