Richie
Member
Registered: 3rd Dec 02
Location: Newport, Wales
User status: Offline
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Being as my system has had to come out of the car i thought i would have a play with my new multimeter. I connected both binding posts up with the cable as you would do to make it drop to 2 ohms, well sure enough, connected the multimeter as you would connect the amp cables to the box and it showed 2 ohms:
But if i connected one lead to the negative of 1 binding post then to the positive of the other binding post it was showing 0.3 ohms!
Someone please explain this? The multimeter is working fine 
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paul_spurrell
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Registered: 14th Sep 01
Location: Bath Avon
User status: Offline
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looks like a bomb
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Savinforcorsaproject
Member
Registered: 3rd Aug 03
User status: Offline
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In the 2nd pic sudnt it show 4ohms?
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Richie
Member
Registered: 3rd Dec 02
Location: Newport, Wales
User status: Offline
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No because the subs are already wired in parallel hence the yellow cable. The multimeter is just acting how the amp would connect to the system.
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TOMAS
Member
Registered: 7th Aug 02
Location: Nottinghamshire
User status: Offline
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Nah you are creating a short circuit, its bypassing all the coils. Thats the resistance of the copper wire used i think you'll find. Quite normal.
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Richie
Member
Registered: 3rd Dec 02
Location: Newport, Wales
User status: Offline
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How can that be when its the negative of one coil and the positive of another?
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TOMAS
Member
Registered: 7th Aug 02
Location: Nottinghamshire
User status: Offline
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Its shooting straight up the positive speaker wire from the 'amp', into the binding post, straight into the multimeter and back out the multimeter into the other neg binding post and back into the 'amp', your missing out all the coils!
[Edited on 08-11-2003 by TOMAS]
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kev_corsa
Member
Registered: 7th Nov 02
Location: Newport, Uni in Bristol
User status: Offline
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yeh but that would measure open circuit unless the wires which connect to the amp are shorted together.
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SteveW
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Registered: 15th Jul 02
Location: Up in the clouds
User status: Offline
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This is pretty much what my system did 
This is simulating a broken voicecoil or two... When i blew my sub, the amp was reading "low ohm" signs
When i went back to Soundgallery they measured it and i was at something like 0.3ish
Thus it was blown, ergo, your subs are blown to the multimeter 
maybe
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