igotyourba
I know that ohms are teh amount of resistance the speaker causes and that's about it. I read other answers on here and they don't make sense to me. But anyways, I need to know about ohms so I can choose car audio components. I want to have 2 amps, a 2 channel or 4 channel bridged to 2 to go to a box with 2 subwoofers. I want to have another 4 channel amp to go to my car speakers (LF, RF, LR, RR). I need to know what kind of speakers I can buy (ohms-wise) to make tthis work. How many ohms should an amplifier set up have? and what are some examples of how wattages should work between the amp and speakers.
Answer
When dealing with subs amp and speakers you must focus on the RMS wattage of each. You have to match the rms wattage of the amps to the rms wattage of the subwoofers or speakers. The RMS wattage tells you the amount of power the sub, amp or speaker can handle consistently without pushing the risk of blowing or frying anything.
You are right about ohms. They tell the amount of resistance and how much power a product can produce when wired at a one, two, four, or eight ohm load. In order for you to match up speaker or subs to amps just figure out the rms wattage of the sub and match it with an amp.
Usually subs are wired at a 2 ohm load but you can wire them at 4 ohm and bridge wires and all sorts of wild things.
If you want 2 amps then you'll need a mono amp for the subs and a 4 channel for the speakers. You can buy any speaker/sub and amp combination as long as the rms watts match up. You can choose to wire your subs and amp to any ohm resistance (mostly 2 or 4 ohms)
So buy an amp that can match the rms wattage of your subs at a 2 or 4 ohm load. The wattage of the amp will be split giving each sub equal amounts of power at a ohm load. And with the 4-channel amp, at a certain load the amp will provide a certain amount of power over four channels
Examples:
speakers:
you have four speakers that can handle 100 watts rms each
buy a 4-channel amp that when wired at two or four ohm can put 100 watts rms over each of the four channels. the 4-channel amp would have 400 watts rms.
Subwoofer ( 2 in your case):
Both subs can handle 500 watts rms each
You would buy a mono amp that can supply 1000 watts rms at a 2 or 4 ohm load. and when wired up the 1000 watts rms will be split to each speaker giving them 500 watts rms each.
There are many other ways to build a system but this explanation is the standard for car audio.
For a great brand you should try Alpine for your deck, speakers, amps, and subs. My entire system is alpine and i love it to death.
I hope this helps and for more insightful info on just about anything try this link: http://www.crutchfield.com/App/Tab/Learn.aspx
I hope this helps and good luck.
When dealing with subs amp and speakers you must focus on the RMS wattage of each. You have to match the rms wattage of the amps to the rms wattage of the subwoofers or speakers. The RMS wattage tells you the amount of power the sub, amp or speaker can handle consistently without pushing the risk of blowing or frying anything.
You are right about ohms. They tell the amount of resistance and how much power a product can produce when wired at a one, two, four, or eight ohm load. In order for you to match up speaker or subs to amps just figure out the rms wattage of the sub and match it with an amp.
Usually subs are wired at a 2 ohm load but you can wire them at 4 ohm and bridge wires and all sorts of wild things.
If you want 2 amps then you'll need a mono amp for the subs and a 4 channel for the speakers. You can buy any speaker/sub and amp combination as long as the rms watts match up. You can choose to wire your subs and amp to any ohm resistance (mostly 2 or 4 ohms)
So buy an amp that can match the rms wattage of your subs at a 2 or 4 ohm load. The wattage of the amp will be split giving each sub equal amounts of power at a ohm load. And with the 4-channel amp, at a certain load the amp will provide a certain amount of power over four channels
Examples:
speakers:
you have four speakers that can handle 100 watts rms each
buy a 4-channel amp that when wired at two or four ohm can put 100 watts rms over each of the four channels. the 4-channel amp would have 400 watts rms.
Subwoofer ( 2 in your case):
Both subs can handle 500 watts rms each
You would buy a mono amp that can supply 1000 watts rms at a 2 or 4 ohm load. and when wired up the 1000 watts rms will be split to each speaker giving them 500 watts rms each.
There are many other ways to build a system but this explanation is the standard for car audio.
For a great brand you should try Alpine for your deck, speakers, amps, and subs. My entire system is alpine and i love it to death.
I hope this helps and for more insightful info on just about anything try this link: http://www.crutchfield.com/App/Tab/Learn.aspx
I hope this helps and good luck.
4 ohm speakers (or 8 ohm speakers) for an 8 ohm amp/system?
Shannon
I have a nice and old Mercedes c220 (1996). We figured out that the system works on 8 ohms. Sadly, there are -39875 speakers out there that run 8 ohms (that aren't ridiculously expensive). Are there any 8 ohms speakers (preferably 5.25inch) that have good quality (around but no more than 50$)? If not, what limits can I push with the 4 ohms, and are there any that can be safe for my 8 ohm receiver? I listen to classical (as in 1700's 1800's classical) music, so unless the speaker is naturally loud, you kinda gotta crank the volume...
Answer
I'm a little surprised that your Mercedes head-end unit is 8 Ohms. Automotive systems have been lower impedance for as long as I've been paying attention to them (40+ years).
Having said that: Even if the head-end unit is rated for 8 Ohm operation, you could probably get away with hooking up speakers rated at 4 Ohms. You'll have to watch the volume control a bit, but the lower impedance speakers will sound louder than 8 Ohm speakers, regardless.
My first recommendation, though, would be to get some more amplification. Since you're not trying to build a rolling boom box, a modest-size amplifier-equalizer combination, perhaps installed in the trunk, would provide all the power you need for your musical tastes. It is also very handy to be able to equalize the amplification to compensate for the peculiarities of an automobile passenger compartment.
I'm a little surprised that your Mercedes head-end unit is 8 Ohms. Automotive systems have been lower impedance for as long as I've been paying attention to them (40+ years).
Having said that: Even if the head-end unit is rated for 8 Ohm operation, you could probably get away with hooking up speakers rated at 4 Ohms. You'll have to watch the volume control a bit, but the lower impedance speakers will sound louder than 8 Ohm speakers, regardless.
My first recommendation, though, would be to get some more amplification. Since you're not trying to build a rolling boom box, a modest-size amplifier-equalizer combination, perhaps installed in the trunk, would provide all the power you need for your musical tastes. It is also very handy to be able to equalize the amplification to compensate for the peculiarities of an automobile passenger compartment.
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Title Post: How to choose a car audio system (amp, speakers) with correct ohms?
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Author: Yukie
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