Question about Labtec Pulse 420 Computer Speakers

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I lost the wall plug in power cord to my Labtec Pule 420 speakers. Model #: S-LBD49

The plug in on the back of the subwoofer says 15V DC Input.

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Posted on Jan 02, 2017

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SOURCE: no wires for labtec lcs-3210

1500mA @ 15VDC. I've got a set of these speakers and I just looked at the adapter.

Posted on Aug 23, 2009

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rommelalilin
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SOURCE: I need a AC/DC power

Radio Shack

Posted on Jan 14, 2011

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1 Answer

Kef subwoofer cuts out at high volumes


I have experienced the problem of the output cutting out in a KEF PSW2500. I have also previously replaced C52 which is mentioned in previous posts and is the storage capacitor to power U13 that protects the speaker from direct current in case of fault. The problem of cut out at high volume levels occurs on my unit as follows: When the input level is high in bass content, regardless of the input level (VR1) setting on the back of the unit, the output has a loud pop and stops until power is recycled, or just pops loudly on peaks but will recover. If I remove one channel of the input the problem is much less apparent.

The previous C52 fix corrected the buzzing noise caused by the protection relay coming on and off when the capacitor was dry, but the new problem is slightly related as follows: The audio operational amplifiers (opamps) make up the filter and gain stages and are powered by a +/-15V supply composed of U14 and U15. If you measure the -15V output (this can be done without the speaker connected and using a VOM) you may see that its output will go to 0V during peaks or may lock at 0v while the +15V side is stable. If you do measure this, the result is that the output of the opamps will have DC on them instead of 0V, causing U13 to detect this and shut down the output to the speaker to avoid damage.

Cause: The cause of this problem is due to the lack of input capacitors in the original design, between the Vin pin and ground of the voltage regulator IC's which in some cases can lead to latch up of one of the regulator IC's; especially the negative regulator (U15, LM7915). This part is not defective, but just latching up due to instability in the design.

Fix: To fix this problem, you need to add some components as follows: For simplicity sake, I used the same 47uF/63V parts that are used in the C52 repair. You need to solder 2 pieces in parallel with Vin and ground of U15, making sure the minus side of the capacitor is to the input and the plus side is to ground. Secondly, you need to solder 1 piece to the Vin and ground of U14, where in this case the minus side will go to the ground and the plus side to the input. Note: If you get the polarity wrong, the capacitor will blow up due to overheating. The reason that you unbalance the capacitors, is so that you make sure the positive regulator comes on first and then the negative regulator second. This is well documented by the manufacturers of the parts so it is not new.

Since this instability may be due to parts ageing, you may also want to add 1 piece of capacitor at each side of the +/-15V connector on the preamp board side, which is labeled CN2. This will make sure the audio circuits still have a healthy filter on the supply to keep the audio nice and clean. Note that the ground is common between the supplies so CN2 is only 3 pins.

You can test the unit without the speaker connected first with some high level content while re-checking the 15V supplies. Both should be stable and the protection relay should only come on when powered up and stay engaged anytime there is music content. If that checks out, re-assemble the unit (remembering to connect the red and black speaker wires) and enjoy your new sounding sub-woofer.

Dec 01, 2012 | KEF Audio PSW 2500 Subwoofer

1 Answer

The power supplies / ac adapters for my AW-871 speakers were both lost in a recent move. The speakers show input of 15v center + but no power spec. Do you have a suggestion for replacements? Thanks for...


Higher voltage then required is not so recommended, internal circuit may over voltage driven. some power amp max limit may fall within 18V only. See this link If your speaker power less then 30w you can choose 15V 2A will do or else select higher spec.

Jul 23, 2011 | Acoustic Research 900MHz Wireless Stereo...

1 Answer

I need a 15V AC to AC adapter for ouir Audio Source home theatre subwoofer. Can you help? I can easily find 15V AC to DC and the only 15V AC to AC power source cables I can find are for Toshiba...


Sure! An Audio Source Sub power adapter is $38 +$9 shipping from this seller. It's importnat to know the power requirements of the device in either watts or amps to choose an adapter capable of serving the load. Otherwise, it might be too small and cause a fire. This one looks like it is like the one supplied originally.

I hope this helped & good luck!!

Nov 01, 2010 | Audio Players & Recorders

1 Answer

Basslink works for a few seconds after i turn on the stereo, then it fades away. The servo light is always on even when i disconnect the input line and turn the knobs to the min level. What could be wrong?


Hello, check the +15v and -15v on the Switching Power Supply Control board. If one or both are missing, it is probably Q117 for +15v and Q118 for -15v. If one is missing the limit comparator will rail to one side and cause the auto variable volume control to trip the servo protection.

Oct 02, 2010 | Infinity BASSLINK Car Subwoofer

1 Answer

Basslink has no output, but Power LED and Servo LED always on.


Hi,

One or more of the DC to DC outputs might be bad. Check the
/- 54v on the main PCB and the /-15v on the switching controller PCB.
Losing one side of the 15v will cause the limit comparator to rail and force the servo protection, even with no input signal.

Apr 02, 2010 | Infinity BASSLINK Car Subwoofer

3 Answers

I need to get a power supply for Advent SUB


The adapter in question has the following specs:
Input: AC 120V 60Hz 30W
Output: AC 15V 1500mA 22.5VA

Nov 04, 2009 | Audio Players & Recorders

1 Answer

There are 2 sets of wires on the rca rt2760 home theatre system subwoofer, i know thay the purple ones are the speaker inputs......but the red and black is dc input for the amp thats inside the...


one is for the speaker connection the other is a control wire for the sub that should have a white plug on it to plug in the back of receiver

Oct 13, 2009 | RCA RT2760 System

1 Answer

Monsoon power cord needed on old computer speakers


leejean


the very best way to solve your problem, go to the electronic store and ask a dc power supply adapter 15volt 2A,vice versa polarity. with universal connector for it sure you can select the right type connector do you have for it fit to the back socket of your unit. before you connect read the correct polarity of your device you see label at back (+, -). and set the polarity output of the adapter correspond to your unit,,,

johnfil,,,,

Oct 07, 2008 | Level 9 Sound Designs Monsoon Planar Media...

7 Answers

What voltage required to power a sony subwoofer


Hey,

I just got one of these units, the SONY SS-WG990.
The RCA cable is direct conection to the speaker.
It requires external AMP.
The other cable is just for the system switch and LED.
If you just have this unit, all you need is an AMP to
feed it.

Apr 12, 2008 | Audio Players & Recorders

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