This is just going to be a short instructable because of its simplicity. This only works with the speakers that have the positive and negative wires that hook into a stereo. To tell if the speaker is blown or not without taking it apart is really easy. All you have to do is take a 9 volt battery and touch it to the wires. If it makes scratching noises its good. If it makes no sound at all its blown.
<p>I too would use a DMM to test for continuity and resistance. Also a speaker could be damaged but not completely blown and using a battery to make it generate noise will not tell you if it's going to reproduce music very well. I do use the AA test method frequently when trying to locate which speaker is tied to which wires in a vehicle.</p>
<p>If it's not blown before this is probabaly will be afterwards ;) an easier way to check is with a DMM</p>
I'd say the best way is with an ohm meter but DC will kill the speakers. I'd only use a 9v to check polarity on big subs such as my Electrovoice EVX180s.
The only thing wrong with your comment is when you use an ohm meter it actually uses a set DC voltage to test the resistance so if your meter is powered off of a 9v batt. your actually checking ohms with 9v <br>
Sounds good. I did the math and if W = V^2/R then with a fresh 9 volt battery you're subjecting an 8 ohm speaker to a little over 10 Watts of power. 10 watts doesn't sound like much but distortion seems to do more damage to speakers in my experience than clean signals do. &quot;Scratching noises&quot; is my definition of distortion too. <br> <br>A lot of times speakers don't have sophisticated crossovers in them, just non-polar electrolytic capacitors, and the caps fail more often than speaker drivers. Although I've burnt out a lot of tweeters over the years myself. Most tweeters can't handle too many watts.
For a PP3, actually getting your full 10 watts (1.125 Amps) isn't going to be very likely. That's quite a load ... <br> <br>Usually this test is done with a 1.5V cell (AA), just to test polarity (positive battery to positive/red speaker = cone pushes OUT). <br> <br>

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