Question about Altec Lansing ACS 251 Computer Speakers

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My subwoofer is making a strange kind of noise n frequently it goes off by itself..this happened since the left front speaker started making some crakling noise every time n later the situation aggravated and nw its almost impossible for me to listen to a song or doing something as my subwoofer does a very loud noise n its jst too damn annoying!!!!

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  • 123 Answers

Hi

Good day. In regards to your issue your speaker connector might be grounded and there's no way to fix that i''m sorry. But try to do this step first to be sure

1.Make sure your speakers are plugged in, turned on, and properly connected to the
computer
. You've probably checked this, but it's amazing how little problems like this (or the
computer's sound being muted) manage to confound people.

2. Plug the speakers in to another computer, if possible. If the speakers work with the other
computer, proceed to the next step. If they don't, you've probably got a problem within the
speakers themselves.

3. Check sound card driver
> Open your start menu (right-click on the "Start" button and choose "Explore"), and find the "My
Computer" icon. Right-click on it and choose "Properties" from the submenu. Click on the
"Hardware" tab and then the "Device Manager" button.
> Expand the "Sounds, video, and game controllers" heading to find your sound card. The name
will depend on what sound card is installed on your PC. It will most likely have a name
containing "audio." It should look something similar to the example above. You'll know
immediately if there is a major driver error because an exclamation point (!) will show over the
card's icon.
> Double-click on the name of the sound card to open a new window. In the new properties window
click on the "Drivers" tab. If there is no "Drivers" tab then you chose the wrong sound device. Go
back and try again. On the "Drivers" tab, click the "Driver Update" button. Follow the Wizard's
onscreen instructions to update your driver. You can also contact the manufacturer of your PC
for the most recent audio drivers. They can usually be found online.
> If you already have the most recent driver, click the "Uninstall Driver" button. Then restart your
computer. When you restart your computer, the driver should reinstall automatically. If it does
not, install it manually with software (or a download) from the manufacturer.

4. Check the "Windows Troubleshooter". On the "Drivers" tab mentioned in the step above,
there is a button for troubleshooting the device. Click on that button, and follow the instructions
on screen.

5. Check the sound card itself. Properly shut down your PC and then disconnect all cables on
the back of your PC, including the power cable. Open up the CPU, making sure to touch a
grounded metal object (a doorknob or metal desk will work, for example) before opening up the
case. This will discharge any static electricity you have built up, which could damage your
computer.
> Locate the audio plug on the back of your PC. The sound card should be in the corresponding
location on the inside of the PC. Remove the sound card and put it back in. The Microsoft site
has detailed directions for installing a sound card; to remove one, simply do the reverse. Once
you have the sound card back in, reattach the cables you unplugged earlier and boot your PC

It this steps didn't work you might consider getting a new one. Hope this help you in someway and thanks for visiting Fixya. Have a wonderful day.

Posted on May 22, 2011

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1 Answer

My sub make a strange noise. It doesen't work anymore.Tks.


Strange noises can come from your amplifier or the sub itself. The most likely cause of the strange noise is the speaker just before it dies! If you have been using the sub-woofer at high volume levels then you probably have damaged it. Try testing the sub-woofer using a multimeter(on ohms setting) it should give you a reading from 8 to 4 ohms. Sometimes they may give readings as low as 1 ohm. When testing the speaker/sub you should hear a soft scratchy, thumping or clicking sound. This indicates that the speaker may still be working. If you don't have a multimeter try a 1.5 volt battery (say a AA), DONT USE HIGHER VOLTAGE BATTERIES they may damage the speaker! You will hear a clicking, scratching etc sound from the speaker which may indicate that it is still OK. If the speaker seems OK the problem may be in the amplifier, which I suggest you bring to a professional repairer. When buying speakers and amplifiers make sure the power handling of the speaker is equal to or greater than the amplifier output power. This should stop speakers from getting damaged. Make sure the speaker and amplifier specifications are rated in the same manner ie RMS PMPO Peak. A 100 Watt PMPO speaker will not survive the output of a 100Watt RMS amplifier!

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Offhand, could either be the subwoofer speaker itself or the electronics (amp and/or crossover). One way to determine is by physcially checking the sub speaker. When playing with bass on, pls try restricting speaker movement by pressing on it and see if the noise is reduced. Another is to temporarily replace the speaker. You can try speakers meant for the car, home entertainment or book shelf, just dont set the volume too high.

If the speakers are ruled out, then it would be the electronics inside. For this, you would need familiairty with electronic components and circuittry, a DVM and a soldering iron. Access to an oscilloscope and an audio signal generator would be nice but not a necessity. The idea is to inject a constant audio signal and determine where the noise (if electronic) is coming from. In most instances, it would be a leaky electrolytic capacitor either in the input stage or feedback loop. At other times, it would be also a capacitor in the band pass filter.

Hope this be of initial help/idea. Pls post back how things turned up or should you need additional information.

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Im sittin here with the wiring harness for my 99 altima, and the wiring thing from the back of my pioneer deh p6700MP, i have no clue which ones to match with the other one?


Here's the manual for the Pioneer -->LINK<--.

This is the 2 options of install wiring on a 97 Altima, I'm not sure if it's exactly the same, I suggest that you don't trust these pinout if yours differ at all.

Radio Constant 12V+ Wire: Pink
Radio Switched 12V+ Wire: Blue
Radio Ground Wire: Chassis
Radio Illumination Wire: Red/Green
Radio Dimmer Wire: Red/Yellow
Antenna Trigger Wire: Green/White
Front Speaker Size: 4′ x 6′
Front Speaker Location: Doors
Left Front Speaker Wire (+): Brown
Left Front Speaker Wire (-): Black/Red
Right Front Speaker Wire (+): Light Green
Right Front Speaker Wire (-): Black/Yellow
Rear Speaker Size: 6 1/2′
Rear Speaker Location: Rear Deck
Left Rear Speaker Wire (+): Orange
Left Rear Speaker Wire (-): Black/Pink
Right Rear Speaker Wire (+): Blue
Right Rear Speaker Wire (-): Black/White

THERE IS AN ALTERNATE WIRING COLOR CODE

THERE IS NO CONTACT PIN OR EXISTING WIRE THAT IS GROUND !!!!! (some really strange things happen to aftermarket radios if you think the Red/yellow wire on pin 9 of the 10-pin connector is ground”!!!!!

Large 10-Pin Connector:
Constant Hot (Memory or Clock) =RED wire pin8
Switched (Ignition) Hor = Blue wire pin4
Left Front Speaker + = Blue/white pin1
Left Front Speaker - = Blue/yellow pin5
Right Front Speaker + = Brown pin2
Right Front Speaker - = Brown/white pin6

The Smaller (6-pin) connector is only for the rear Speaker:
Left Rear + = Red pin5
Left Rear - = Green pin4
Right Rear + = Blue pin2
Right Rear - = Pink pin6

Regards

Philip

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