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Welks_97
Dodge Dakota
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3/15/2002
17:16:48
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 Subject: Problems with Subs
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I have the thunderform for my CC Dakota with the thunder 6000's in it. I noticed that the subs seem to be getting softer. They don't hit as hard. So I pulled them out and tested the resistance on them. Both subs read 6.5 ohms. I believe that they should be 8 ohm. When connected in parallel it should drop down to 4 ohm and my subs are reading 3.5 ohm. Is 6.5 and 3.5 acceptable? Is this why the subs are not as loud? Are they slowly going bad?
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daksport
Dodge Dakota
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5/06/2002
17:25:02
|  RE: Problems with Subs
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lower ohms will make more power go to them. I personally wouldn't buy mtx but this could hurt the speaker. I have no clue why it did it.
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Tronics Brain
Dodge Dakota
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5/06/2002
19:20:24
| RE: Problems with Subs
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First of all, if the speakers were going bad the resistance would go up, not down. My thought is that the speakers were like that from the start. Additionaly, if you measure each speaker and they both read 6.5 Ohms and then you put them in parallel, together they should read 3.25 Ohms, not 3.5 Ohms. Make sure that you are on a resistance scale, on your meter, sensitive enough to destinguish this. If not, you are kidding yourself.
Subs have a tendency to become "Softer Sounding" if continually driven hard. They loosen up.
How do you have the speakers set up in your truck? Series or Parallel. If in parallel, make sure that the amp is compatible with that impedance configuration. If not, you can overdrive the amp and cause it to work harder than it should, thus causing premature failure.
What daksport said was almost right, lower ohms will allow more current to flow through the voice coils. More current means more heat, or power dissipation. There comes a point where the current is too much and you will either fry a speaker or the amp will try to provide more current than it can handle and it will fry.
Make sure that the amp and speakers are compatible and the speakers can handle at least 1 and 1/2 times the maximum output power of the amp. Good luck
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Glenn
Dodge Dakota
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5/07/2002
20:59:01
| RE: Problems with Subs
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The measurement that you are getting with a meter is DC resistance. The 8 ohm rating is what is called nominal impedence which is a combination of DC resisitance and inductive reactance. Inductive reactance is a measurement of what the voice coil does when passed through the magnetic field. To answer you question fully, 6.5 ohms is probably the same as when you bought the subs. The reason that your stereo sounds a little lower in volume is because your ears build up a tolerance to loud volumes. Try leaving your subs off for a week and then turn them back on and see the difference when your hearing returns to normal.
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