Sub problem(s)! [Pics of Multimeter Readings]

[zorced]

Ok 2nrs just bought a used sub and it has the following problems:

- its DVC4ohm and when i hook it up to two 4ohm stable channels it immediately sends the amp into protect without a sound.

I tried my other sub on each channel and it worked 100%, so definitely the amp is fine.

- when I wire one out of the two coils it will play very distorted and you could hear a little rattle as well with hardly any volume. after a few seconds you'll smelling burning from the sub.

So what can you guys make of these problems and is it repairable?

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Update: Pics confirming voice coils defective below

[MonsterPower]

what brand sub? and a simple cheap way to check is to use a battery .. a D-cell or 9v battery and test the coils independantly ...
a multimeter can be used to test for continuity as well as the ohms of the coil .

[3stagevtec]

Get your hands on a multimeter and measure the DC Resistance of each coil. It should be between 3 - 4ohms each.

Don't touch the cone while taking measurements.. don't even let wind blow against the cone.. (try it and see what happens!)

[zorced]

ok will try to get my hands on one.
i bought it for the 8" box really, which i heard was built by you 3stage. (the one u did for justwhatyouseeing)

he had it so cheap with the sub i decided to take both instead of the box alone, i didnt mind usin an audiopipe for the while.... but i dont think even he knew the sub had probs cuz he had it put down for a while and offered to demo on my amp but i told him i had wires from the amp at 4ohm mono and he said he had it playing on a 4channel as well.

But it didnt play then, so we figured it was the way he had it wired in the box, cuz i didnt think the man would come up all the way on my side for nun.

So i say when i reach home i'd just rewire it properly, and thats when i discovered the probs.

if its out of my way to repair it i might just exchange it for sumn cheap.

[justwhatuseeing]

sub and box was put down for a lil while does putting down a speaker for a while has anything to do with the problem cuz it was workin without any problem i am as confused as to this problem as much as the op

[3stagevtec]

Do the test with the multi meter.. that will show if anything wrong with the coils.

Make sure the pigtail wires are not touching the basket too..

[MONGO]

if the sub is out of box inspect it carefully while moving the cone evenly up and down and listen for any coil rubbing noise..the cone should move freely by hand..

[justwhatuseeing]

update?

[zorced]

Real busy these days with work and exams man.
So far I just described the problem to my electrician he said most likely the coils scorched and would have to recoil (how much does this cost neway?).
monday i will get the actual readout on the multimeter..

I would give it back to you for a lil $100 u know. I hardly have time these days to see about that.
it would come like u got $300 for d box which is pretty good.

[zorced]

just as suspected. Dunno how, but the voice coils gone.
1.9 on one coil, 1.2 on the other

[zorced]

thx 3stage, mongo, mp for d help

[3stagevtec]

lol, those look more like dual 2ohm coils!

[zorced]

not even that self lol

too bad it won't work in any case. wouldn't have minded using it till ready to upgrade

[silent_riot]

1) Nice multimeter
2) Sub seems to be dual 2 - your amp may not have been stable into that impedance and went into protect
3) There could be a mechanical defect of the sub causing the smell and noises.

[zorced]

Sub is not dual 2, it indicates Dual 4ohm on the terminals and model # on the magnet.

[hi rollaz]

then probably it was repaired i guess

[TEAM ADT]

try and series bridge the coils and test on one half of your 4channel (4ohm load) and see if it works.It wont kill

[justwhatuseeing]

nah sub was never repaired fellas it was working good just parked down for abt 2 maybe3 months and decided to sell