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<blockquote data-quote="Lasherž" data-source="post: 8707636" data-attributes="member: 679555"><p>Yeah that's an issue I'm dealing with in my car too, but I think maybe he's running a test tone through the ipad instead of through the head unit which is very likely to be the problem. I say even go as far as burning a CD and playing it in the car with the test tone if you need to.</p><p></p><p>The "correct" tuning frequency will depend on impedance so it's dependent on the enclosure and the driver which tone is the best to use. The best way to find it though is to just play a lot of them and figure out which one gives the most voltage and use that. Between 40 and 80 will usually be the right spot. 60hz is the most accurate for non-true rms meters.</p><p></p><p>When you say you measured 4 ohms at the subwoofer, that's actually too high for a 4ohm sub. Impedance goes up as the subwoofer plays, but a DMM can't measure that. So 4 ohms is actually more similar to 5 or 6 ohms impedance on speakers. The resistance DMM value is usually somewhere between 2/3 and 3/4 the impedance value.</p></blockquote><p></p>
[QUOTE="Lasherž, post: 8707636, member: 679555"] Yeah that's an issue I'm dealing with in my car too, but I think maybe he's running a test tone through the ipad instead of through the head unit which is very likely to be the problem. I say even go as far as burning a CD and playing it in the car with the test tone if you need to. The "correct" tuning frequency will depend on impedance so it's dependent on the enclosure and the driver which tone is the best to use. The best way to find it though is to just play a lot of them and figure out which one gives the most voltage and use that. Between 40 and 80 will usually be the right spot. 60hz is the most accurate for non-true rms meters. When you say you measured 4 ohms at the subwoofer, that's actually too high for a 4ohm sub. Impedance goes up as the subwoofer plays, but a DMM can't measure that. So 4 ohms is actually more similar to 5 or 6 ohms impedance on speakers. The resistance DMM value is usually somewhere between 2/3 and 3/4 the impedance value. [/QUOTE]
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