If I recall correctly, the Bose speakers used in a 2002 model year are 2 ohm. For those of you in the know, what is the effect on a system if 4 ohm speakers are used.
Speakers and Ohms
- Thread starter dallen341
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All other things being equal (and they seldom are) the amplifier would run cooler. Some speaker manufacturers use the same design but change electrical parameters. Consider when a speaker designer is deciding on making a 2-Ohm vice 4-Ohm speaker. The voice coil will only hold so much wire, so the 4-ohm speaker will have twice the wire length, but use a thinner wire. As a result the electromagnetic coupling coefficient (Bl value) would also go up by about the same amount resulting in speakers with about the same efficiency. I personally tested this theory using some Seas speakers of different impedance but in the same family - all in a Tacoma I used to own.
All that implies same voice coil/magnet size - which would not be true for speakers from different manufacturers. The end result is it's sort of a craps shoot - changing impedance might be a good thing or it might be a bad thing. Only thing for certain is one should not go to a lower impedance speaker than the amplifier is designed to handle.
All that implies same voice coil/magnet size - which would not be true for speakers from different manufacturers. The end result is it's sort of a craps shoot - changing impedance might be a good thing or it might be a bad thing. Only thing for certain is one should not go to a lower impedance speaker than the amplifier is designed to handle.
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The only thing I understood>>>>Only thing for certain is one should not go to a lower impedance speaker than the amplifier is designed to handle.
Sounds like it is worth a try on running a replacement 4 ohm speaker.
Sounds like it is worth a try on running a replacement 4 ohm speaker.
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Using the 4ohm speakers might require you to turn the volume knob a little further to the right, but other than that it won't hurt.
Generally if an amp is rated to produce a certain amount of power at 2ohms the power would be halved at 4ohms and halved against at 8ohms. Just as it would double at 1ohm and then double again at 1/2ohm if the amp could handle it before either burning up or going into a protection mode.
So if an amp is rated at 100 watts at 8ohms it would be 200@4, 400@2, 800@1, 1600@1/2, and 3200@1/4. I use to run autotek MM3000s in competition back in the day and they were rated 3000@2ohms and we would run them down to 1/2ohm to try and get 12000 watts for just a few seconds. At one point we were using one RE MT 18 with dual 1ohm voice coils paralleled to 1/2ohm in a huge vented box tuned to 40HZ. A 3 second burp inside the vehicle would make your skin crawl and your hair stand up. It was tough to keep 12+ Volts going to the amps though.
Generally if an amp is rated to produce a certain amount of power at 2ohms the power would be halved at 4ohms and halved against at 8ohms. Just as it would double at 1ohm and then double again at 1/2ohm if the amp could handle it before either burning up or going into a protection mode.
So if an amp is rated at 100 watts at 8ohms it would be 200@4, 400@2, 800@1, 1600@1/2, and 3200@1/4. I use to run autotek MM3000s in competition back in the day and they were rated 3000@2ohms and we would run them down to 1/2ohm to try and get 12000 watts for just a few seconds. At one point we were using one RE MT 18 with dual 1ohm voice coils paralleled to 1/2ohm in a huge vented box tuned to 40HZ. A 3 second burp inside the vehicle would make your skin crawl and your hair stand up. It was tough to keep 12+ Volts going to the amps though.
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