8 ohm car speakers

I want to install a vintage car stereo in my 1974 Ford LTD. The thing is, the stereo I wanna install has printed on the back "only for use with 8 ohm speakers", and it has 2 speaker output. If, instead of installing 2 8ohm speakers, could I just install 4 4ohm speakers?

Because I dont wanna screw up the stereo by hooking up speakers with too low impedence, but with the 4 speakers, would it evenly distribute the power output to the 4 4ohm speakers, as it would if I just had 2 8ohm speakers?

You could wire 4 - 4 ohm speakers in series to raise the impedance back to a safe 8 ohm level as your vintage car stereo requires.

It will evenly distribute the power, but remember because you've doubled the number of speakers, it will take the rated power and half it.

2008-12-11 06:11:50 by Mr. W.

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I know I can add the speakers in series of 2 to get 8 ohm for each two but would it have any negative effect on my speakers and or on my amp if I do that?

Adding them is series will work, may not be that efficient though. Many newer amps/receivers are stable to 4ohms, some even lower. My amp will drive 2 ohm's mono bridged (I hate receivers).

on a side note the ohm rating is a little misleading, more like an average, thought that's kind of a weak answer. A speakers impedance (resistance in ohms) varies dramatically through the frequency range. A speaker may be 7 ohms at 800Hz and 3 ohms at 10kHz.

2006-08-03 21:49:45 by mkym111

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I have a home theatre system and it is low watts but it is an excellent speaker system and i recently blew the internal amp and now I am just going to use the speakers and power them through an external amp and use them in my car.
My question is what amp should I buy.
I am planning on running 3 25 watt speakers and a 75 watt sub woofer that all run at 8 ohms and I am going to connect them to a 4 channel car amplifier will this work. I want to run them on this:
http://cgi.ebay.com/4-Channel-1600W-Car- Audio-Amplifier-Amp-Amps-Amplifiers_W0QQ itemZ200337610578QQcmdZViewItemQQptZCar_ Amplifiers?hash=item2ea50d5752&_trks id=p3286.c0.m14&_trkparms=72%3A1234| 66%3A2|65%3A12|39%3A1|240%3A1318|301%3A0 |293%3A1|294%3A50

The rms on the amp is only 160w so u would be fine with that amp...as far as the 8ohm subs it just means that ur not gonna get as much power as if they were 4ohm....u should wire them down to 4ohm to make everything parrallel and also better quality when they match up ohms....

2009-05-03 18:26:19 by Paul R

4 stereo speaker-level inputs. 4 line-level stereo RCA outputs.
Sums up to four speaker-level stereo pairs down to a single stereo RCA low-level output.
Integrate portable media direct to your amp using aux-in and level control.
Multi-function remote controls both the aux-input level and the Channel-4 output to separately adjust bass and aux levels from the same remote source.
Balance levels from multiple speaker-level sources.

I need to replace the blown OEM 6x9 door speakers on a lexus. Amp unit is an ML (Mark Levinson). All ML speakers are spec'd at 8ohm. I've searched all over but couldn't find any 8 ohms (plenty of 4 ohms choices!). A lexus dealer sells what i need for $280. A rip-off!

I've looked at lexus forums but the best answer found is to substitute a 6 1/2 mid-sub with a 6ohm speaker.

So the question and challenge to yahoo!answers is : where can i purchase 8 ohm 6x9 speakers ? THANKS !!!

Salvage yard, excuse me... a used auto parts distributor... might be your best bet.

Be mindful that anything that says Lexus on it will be appropriately priced.

2007-12-29 08:42:49 by DIY-dumb

I have a pair of home cerwin vega speaker that need to be replaced, I want to know if i can replace them with a 4ohm car speaker intead of a 8 ohm home speaker and what is the difference. Can anyone explain the ohm rules?

The transistors used to power the speakers are ": balanced" to see a " LOAD " on the end of the wire. You ae dealing with impedance, ohms, resistance, amperage, and the dynamic curves of the output of the transistors. All these affect the " sound " quality of what you hear from the speakers. Without getting into nitty gritty details that audio gurus would discuss for hours, the most important thing in the physical hook up, is how will replacing the 8 ohms with 4 ohms affect the transistors? Some amplifier circuits actually state " 4 ohm or 8 ohm output " so you are dealing with a crude amplifier that doesnt care. On higher end equipment, though, putting in 4 ohms means that the transistors see 1/2 the " load " they expect and and are continually " shorted out ", using more current flow than they are designed for, which will cause overheating and shorter life. If the transistors are high quality, with huge heatsinks, and were over-designed in the first place by putting larger amperage values than " needed", then you can get away with it, since the over-powerful, high rated transistors can take the extra " short". If you have a unit with cheap transistors which are exactly rated for the output, with no reserve, and are not heatsunk at all or with tiny heatsinks, then you can rapidly overstress them to failure. An 8 ohm speaker will show that the coil of wire wound in the magnet on the back, is about 8 ohms.
A 4 ohm speaker will show about 4 ohms on an ohmeter setting on a typical meter. Since ohms is " resistance", less ohms means that the electricity travels more easily.
A good example would be a toaster. If you put an ohmmeter on the toaster, you find for example 10 ohms. You plug in the toaster and raw, 110 volts goes through the element, and heats it red hot. If you cut the element 1/2 as long, and plug it in, the element still has raw 110 volts, but now only has 5 ohms, and gets yellow hot to white hot, and will last only a short time before it burns itself up. The power generating station at the other end of the house wiring does not care about the huge amount of power being used, and will happily pump in power until the toaster is toasted. If you cut the wire to 1/4 the length the wire will immediately get white hot and probably blow out in front of you.
If you cut the long element in the toaster to just 1/4 inch length, and plug it in to 110, you will have almost NO resistance to the 110 ( 0 ohms ) and the element will light up like a lightbulb, and burn up with a bang.
Back to the amp. The amp is biased or balanced to see an 8 ohm RESISTANCE on the output of the transistors. Think of just shorting out the wires going to the speakers to zero ohms. People do this all the time accidentally with bare wire going into the clips, and the transistors, trying to put out x amps of power see a dead short and will try to put out infinite amps - they are only rated at X amps, and the over stress causes them to over heat, and burn out.. Putting in 4 ohms " One-Half " shorts out the transistors, causing them to try to maintain the pre-set amperage, by using more current ( amps ) than rated. ( it actually is not as simple as this, but close enough for demonstration purposes ).

hope this gives you a rough idea of what is involved without
getting overly technical..

2006-09-18 15:25:32 by josebikerider