I bought the sub from a online dealer and they said it dual 4 Ohm but I think it is dual 8 Ohm. The guy told me that I can measure it but I don't know how. I got a volt meter at home. I turn it to Ohm and measure the negative and postive posts but it's reading no resistant.
Does anyone know how?
Thanks :cheers:
Re: How to know the subwoofer is 4Ohm or 8Ohm (mike76002)
I am pretty sure that you have to measure negative on one voice coil to positve on the other....if that doesn't work let me know what kind of sub it is. If I don't know off the top of my head I can find out.
Re: How to know the subwoofer is 4Ohm or 8Ohm (Kale)
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if its a single, then you just hook up to positive and negative. make sure your ohmmeter isnt set to 2k ohms, and is on the 20 ohm setting
if its dvc you wire it series
of course you can just measure one voice coil. :crazy:
Look like I gotta have a good Volt meter. Mine can only set at 1K Ohm.
However, when it go to 0 Ohm, the scale really big from 0 to 10 Ohm ...
I just go ahead and get the digital one then.
Thanks
:cheers:
Re: How to know the subwoofer is 4Ohm or 8Ohm (mike76002)
I just ran to Radio Shack and got a digital Volt meter and measure it ...
I got around 3.1 Ohms for each coil. When I hook them in parrallel, it went down to 1.52 Ohms. So it is dual 4 Ohms sub.
The sub is Diamond Audio M5 series 12.8. I bought 2 and need to sell one.
Just make sure it is dual 4 Ohm before I post it for sale. I will sell it with my custom box for 250$. I really love Diamond Audio SQ and SPL. It is really tight and accurate so you can hear every single bass note. I had used MTX8000 15", Kicker Solobaric L7 12", JL 12W3 and none of them come close to Diamond Audio ...
thanks :cheers:
Re: How to know the subwoofer is 4Ohm or 8Ohm (mike76002)
Quote:
The sub is Diamond Audio M5 series 12.8. I bought 2 and need to sell one.
Just for future reference, series 12.8 is there dual 4 ohm sub, the 12.4 is there single 4 ohm sub. They only make 4 ohm coils in the M5 series, it is either dual or single denoted by the .4 or .8
Re: How to know the subwoofer is 4Ohm or 8Ohm (mike76002)
Your meter is fine.
The impedance of a speaker is just that. The resistance is what you are measuring with your meter and it's going to be slightly lower than what the impedance of that voice coil is.
Re: How to know the subwoofer is 4Ohm or 8Ohm (VFRLuke)
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Your meter is fine.
The impedance of a speaker is just that. The resistance is what you are measuring with your meter and it's going to be slightly lower than what the impedance of that voice coil is.
Actually, even the impedance numbers they give are just approximations. The impedance of a speaker changes with frequency. When you measure with a meter, you get resistance, which is impedance at zero frequency. As frequency rises, the impedance rises and has a spike at the resonant frequency of the speaker, drops almost to the DC impedance, and then slowly rises again. This rise in impedance determines the upper cutoff frequency for a speaker (its why subwoofers can't play high frequency tones). The spike at the resonant frequency is due to just that: resonance. Its like when you swing a weight at the end of a string. At a certain speed, you don't have to move your hand to keep the weight spinning, you just have to use force to keep your hand in the same place. The speaker works the same way, except that motion becomes current and force becomes voltage. At the resonant frequency, the speaker is moving so that it induces current in the opposite direction of the way the amp is pushing current. No current flows, but the voltage oscillates. High voltage and low current means high impedance. The rise in impedance in the upper frequency is because the voice coil is a big inductor. The impedance of an inductor rises proportionally with frequency. The bigger the inductor, the faster it rises.
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How to know the subwoofer is 4Ohm or 8Ohm
