Is my Sub woofer 1 OHM or 4 OHM?

hassy786 · Apr 8, 2014

I have a 350 Watt Sub woofer and 400 Watt AMP and I am trying to work out how many OHMS my Sub woofer is.. I used my Multi Meter and changed the setting to "OHMS - 2000" and got the reading "004" and when I changed the Multi Meter setting to "OHMS - 200" the Multi Meter jumps between the reading "066 - 072"??

Does this mean my 350 Watt Sub woofer is a 1 OHM or a 4 OHM?? I don't know how to work out how many inches the sub woofer is.

Anyone give a reply!! I'm stuck at this problem because if I don't solve this I cant set the Gains on the AMP!!

Eduello · Apr 8, 2014

What is the subwoofer model?

hassy786 · Apr 8, 2014

Eduello :

I have no idea.. When i opened the Sub woofer box up to find some details about the speaker all I found on the speaker was 350 Watts in big writing and it said 30AL next to it.. The name of the speaker is NEXT but that is all I know.

Eduello · Apr 8, 2014

Where did you buy it from? Did it have packaging?

hassy786 · Apr 8, 2014

Eduello :

It was my dads he left it in the garage for well several years .. So im guessing he has no packaging for it I asked him if he knows anything about the speaker and he said he had no idea so im alone on this one

.. Its funny because when the multi meter setting is at 2000 the multi meter reads 004 which is 4 OHMS right? but then when it is set to 200 it jumps between 066 and 072 ? If you had to guess would you guess it is a 1 OHM or a 4 OHM? are there any other ways I can be sure how many OHMS it is?

Eduello · Apr 8, 2014

I'd say it's four, but I'm not sure though.

Read the "why are ohms important" part: http

/www.prestonelectronics.com/audio/Impedance.htm

Your amp is with 99.9% certainty a "solid state" one, though you could check that out from the manufacturer's website. That would mean you could run it at 1 OHM and if it starts to heat up then set it to 4 and see what you get.

hassy786 · Apr 8, 2014

Eduello :

This is how the speaker is currently connected to the AMP ....
https

/www.dropbox.com/s/eitvrdlks48i2zd/DSC_1103.JPG

Is it running at 1OHM or 4OHM?

Eduello · Apr 8, 2014

hassy786 :

If it doesn't have a manual switch, it automatically sets the impedance provided that the AMP can actually output an 1 OHM signal (you can check that from the manufacturer's website too).

americanaudiophile · Apr 8, 2014

You seem to have multiple threads about this setup. Since your amp has not blown up when driving the sub you don't need to worry about the impedance of the sub. The amp doesn't "adjust" it self to the impedance, it just needs to be stable enough to drive the impedance. If it wasn't it would have shut down, blown fuses, or self-destructed.
Just set the level of the sub out on the PC which you have connected to the amp so that the sub level is matched to the other speakers. The impedance of the sub and the efficiency of the sub in its box do affect that level but so long as you have enough gain to get it where it sounds right to you don't sweat it.

hassy786 · Apr 8, 2014

americanaudiophile :

Yes I have many questions I need to ask about this setup creating different threads so people do not get confused.. So your saying I should just use my ear to set the Gain and Bass Boost etc until I think it sounds right? Have done this ones and it sounds amazing shakes the house etc however I do not want to risk keeping it at that which can cause blown fuses etc which I do not want to happen so I want to set the Gain properly like everyone does but without knowing the OHM of my speaker it is hard to do this??

hassy786 · Apr 8, 2014

Eduello :

I now have the Sub woofer wires connected to the AMP like this https

/www.dropbox.com/s/aj5aytg9pcizop6/DSC_1110.JPG

Before this they were connected like this .. https

/www.dropbox.com/s/eitvrdlks48i2zd/DSC_1103.JPG

I checked with a Multi Meter how much voltage is given out when the Gain is set on max and the Bass Boost also on max and noticed when the wires are set like this https

/www.dropbox.com/s/aj5aytg9pcizop6/DSC_1110.JPG I can reach more than 50V but when they are connected to the AMP like this https

/www.dropbox.com/s/eitvrdlks48i2zd/DSC_1103.JPG I can reach a Maximum of 30V .. Now I have an idea of keeping the wires like the first picture and set the Gain and Bass Boost to 40V and see what happens.. Reason why I said 40V is because if the speaker is 4 OHMs then 400 Watt x 4 = 1600 and then Square Root of that is 40 .. Who thinks I should do this??

americanaudiophile · Apr 10, 2014

You have a stereo amplifier with a single woofer so it should be connected the way you had it originally.
If you have an amp that can be bridged to mono then that would require you to connect the speaker to the positive terminals. This would give you more power but less stability. I would use it as you originally had it connected if you are not sure of the impedance of the woofer. Sounds like you had plenty of power the first way.
Again you cannot set the gain by the numbers you are trying to use. The box of the speaker and the room are just as important as the impedance. If the amp is stable with the sub it will be fine.

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Is my Sub woofer 1 OHM or 4 OHM?

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