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Powered Sub no sound? - Page 2

post #11 of 26
Thread Starter 
Yes thats is where I tested it at. I also just tested the amp running your sine wavs 50 file, and ran the voltmeter to where I unplugged the driver from and did not get a reading at all.

I believe the amp is dead, but is there any additional ways to verify that the driver is still good before I spend the money to replace the amp?

Can I plug the driver up to an old stereo system via +- cables it puts out 150watter per channel? Would this hurt it?

I just want to verify that it will still play sound
post #12 of 26
Quote:
Originally Posted by jdouglas View Post
Yes thats is where I tested it at. I also just tested the amp running your sine wavs 50 file, and ran the voltmeter to where I unplugged the driver from and did not get a reading at all.

I believe the amp is dead, but is there any additional ways to verify that the driver is still good before I spend the money to replace the amp?

Can I plug the driver up to an old stereo system via +- cables it puts out 150watter per channel? Would this hurt it?

I just want to verify that it will still play sound
If that's where you tested for resistance, then that's not right. Resistance shouldn't change unless there's a signal going through it too.

And yes, you CAN plug the driver into whatever stereo you want. Just be careful with the volume (keep it low). Especially if you're going to try it free air (no box). Problem being, there's no crossover in place, so the driver would receive full frequency instead of just bass.
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post #13 of 26
Thread Starter 
At the back of the driver a red and a black wire run out of it to the amp... From these 2 wires is not where I test impendance? the alternating could be due to the voltmeter.

Yes the Amplifier is the only thing not in the box its sitting here on my work bench plugged up with the line from the receiver running into it. I tested the wire/ receiver by using a small computer sub that my brother has it is producing bass, when I plug up the amp I set it to ACV and touched the 2 points where I unplugged the black and red wires. And I get a reading of 0, I also moved the voltmeter around the 3 different settings under ACV and only get a reading of 0.

Apparently the driver is Fine it hits nice and hard, from this stereo at volume 2 haha, I only tested for 10 seconds.
Edited by jdouglas - 3/30/11 at 4:11pm
post #14 of 26
Thread Starter 
double post
post #15 of 26
Quote:
Originally Posted by jdouglas View Post
At the back of the driver a red and a black wire run out of it to the amp... From these 2 wires is not where I test impendance? the alternating could be due to the voltmeter.

Yes the Amplifier is the only thing not in the box its sitting here on my work bench plugged up with the line from the receiver running into it. I tested the wire/ receiver by using a small computer sub that my brother has it is producing bass, when I plug up the amp I set it to ACV and touched the 2 points where I unplugged the black and red wires. And I get a reading of 0, I also moved the voltmeter around the 3 different settings under ACV and only get a reading of 0.
Was it 0.4 ohms, or 4 ohms. BIG difference there. It should be reading either 4 or 8ohms, or very near that. But yes, sounds like you did that part correctly, assuming the amplifier wasn't anywhere near it (completely unhooked).

To test the output of the amplifier, yes you'd hook up to the speaker line outputs that run directly to the driver. You'd hook the meter up as if it were the driver. And test for AC Voltage (with probably the 200v setting on the meter). And from there, you'd turn the volume and gain up to see if you get output.

You could also hook some other amplified speaker / sub up to the reciever, and see if that works (using the same RCA cable). You could also try hooking another passive speaker up to the amplifier (being careful with volume and gain). You could also try hooking the subwoofer driver up to another amplifier / receiver / stereo, again being careful with volume.
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post #16 of 26
Thread Starter 
4.0 Im a little dislexic typing today

also in case you missed this in my edit of the last post

Apparently the driver is Fine it hits nice and hard, from this stereo at volume 2 haha, I only tested for 10 seconds.
post #17 of 26
Quote:
Originally Posted by jdouglas View Post
4.0 Im a little dislexic typing today

also in case you missed this in my edit of the last post

Apparently the driver is Fine it hits nice and hard, from this stereo at volume 2 haha, I only tested for 10 seconds.
Okay, so now you just have to figure out if its the amplifier, or the signal. So hook another amplified speaker set (PC speakers work fine) to the RCA line that you had running to the amplifier. If the speakers work fine...then your amp is dead. If they don't work...then its a signal issue.

You may or may not need an RCA to 3.5mm adapter to do this. Could also use another stereo as well, that has RCA inputs.
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post #18 of 26
Thread Starter 
The stereo I do have only has the stripped cable method of hook ups. So I would do

Receiver -(3.5mm to rca)- Amp -(?) additional speakers?

What cable am I using to hook the amp to additional speakers?
post #19 of 26
Quote:
Originally Posted by jdouglas View Post
The stereo I do have only has the stripped cable method of hook ups. So I would do

Receiver -(3.5mm to rca)- Amp -(?) additional speakers?
Okay, so we know the receiver works, and we know the subwoofer driver works. This means its either a signal problem or an amplifier problem.

Receiver -> RCA Cable on the sub pre out -> Another amplifier / stereo -> Speakers
(if its PC speakers, you MIGHT need a RCA female to 3.5mm female adapter, so the PC Speakers can use the same port as a PC).

If you're just hooking up another stereo that has RCA inputs, then you don't need the adapter. The other stereo that you have, has no inputs at all? If it doesn't then that won't work. It has to have an input of some kind. The "stripped wires" is for speakers.

Quote:
What cable am I using to hook the amp to additional speakers?
Depends on the amp and speakers. Assuming you're testing the sub amp with some other speakers, it really won't do any good at this point, as we already know the subwoofer works. So you can hook the subwoofer back up to its amplifier at this point. You just need to figure out if its the signal that's not getting to the amplifier, or if the amplfier isn't working.
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post #20 of 26
Thread Starter 
Oh got ya, yea i already tested the signal, with my stereo it does have RCA inputs(thought you meant output) The signal is playing on the speakers/ sub(thats how I tested the driver since the cd player went out in it)
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