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post #1 of 9 (permalink) Old 07-18-2011, 05:19 PM Thread Starter
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Speaker questions

Hey I was wonder what the measurements were on the speakers in 300ms. I wanted to upgrade my system but I don't know that the rear door speaker size is or the tweeter or the center dash.
TIA
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post #2 of 9 (permalink) Old 07-18-2011, 05:23 PM
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Not sure on the tweeters or the center, but Im thinking the rears is 6x9's
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post #3 of 9 (permalink) Old 07-18-2011, 05:26 PM
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the stock infinity system is designed for use with 2 ohm speakers (which are fairly hard to come by). if you want to upgrade your system with new speakers then you will also need to replace the amp with one designed for 4 ohm speakers, otherwise you will lose more than half of the amps power output and you will ruin the factory amplifier. as far as the speaker sizes, i am not sure what the exact sizes are right off hand but i do know that there are several other threads that list the sizes of the speakers you need. just do a search of the DI.net forums and you should be able to find them
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post #4 of 9 (permalink) Old 07-18-2011, 05:29 PM
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Originally Posted by 01Intrepid View Post
Not sure on the tweeters or the center, but Im thinking the rears is 6x9's
the rear deck speakers are 6x9s. i had to replace mine. it sounds like he has the 11 speaker infinity system because he is asking about rear door speakers, but i do not know the size of them.
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post #5 of 9 (permalink) Old 07-18-2011, 06:07 PM
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I take it you got your amp turn on issue straightened out?

The center dash and rear door speakers are some odd size like 3". I'd have to take a look at one of my spare rear door panels. They are all 2 ohm speakers. If you had a Base or Midline system your original speakers would be 4 ohm. Are you going to upgrade the speakers and use the factory 360w amp? if so, your replacements need to be 2 ohm.
The sails are 3" with a 3 3/8" center to center distance between the two mounting flanges. I believe the rear door and center dash is about the same size speaker as the sail for diameter. Again I'd have to check. Biggest difference there is that the center/rear speakers will have a much greater mounting depth than the sails because they have much bigger magnets.

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post #6 of 9 (permalink) Old 07-22-2011, 01:38 PM
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then you will also need to replace the amp with one designed for 4 ohm speakers, otherwise you will lose more than half of the amps power output and you will ruin the factory amplifier.
As an electronics technician, I can state with 100% accuracy that connecting speakers with a higher impedance to a solid state amplifier cannot and will not damage the amplifier. The issues with connecting a speaker with too large an impedance to an amplifier only relates to a vacuum tube type amplifier with an output transformer.

Now connecting too low an impedance to the output of a modern amplifier is a different issue. The additional current requirement as the load impedance approaches a short circuit will most likely toast the output devices of the amp when connecting a load with a smaller impedance then specified by the manufacturer.

By the way,
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post #7 of 9 (permalink) Old 07-22-2011, 02:18 PM
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Originally Posted by short_circutz View Post
As an electronics technician, I can state with 100% accuracy that connecting speakers with a higher impedance to a solid state amplifier cannot and will not damage the amplifier. The issues with connecting a speaker with too large an impedance to an amplifier only relates to a vacuum tube type amplifier with an output transformer.

Now connecting too low an impedance to the output of a modern amplifier is a different issue. The additional current requirement as the load impedance approaches a short circuit will most likely toast the output devices of the amp when connecting a load with a smaller impedance then specified by the manufacturer.

By the way,
In other words, a 4Ω speaker on a 2Ω amp is OK but a 2Ω speaker on a 4Ω amp isn't? Or do I have that backward?
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post #8 of 9 (permalink) Old 07-27-2011, 05:05 PM
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In other words, a 4Ω speaker on a 2Ω amp is OK but a 2Ω speaker on a 4Ω amp isn't? Or do I have that backward?
that sounds right. also, if you're wondering about speaker sizes and things like that I've always had good luck with Crutchfield, at least for information. They don't have great deals on everything, but I built my own system from scratch pretty much with their infor. Just IMHO though.
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post #9 of 9 (permalink) Old 07-29-2011, 11:36 AM
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In other words, a 4Ω speaker on a 2Ω amp is OK but a 2Ω speaker on a 4Ω amp isn't? Or do I have that backward?
Nope, you have that correct. Also, when an amplifier is run in bridged mode, it will only "see" one-half of the total impedance connected to it. So, for example, if the amplifier is 2 ohm stable in stereo mode, the minimum load you could use in bridged mode is 4 ohms.
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