Question about Logitech Z-2300 Computer Speakers

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Very quiet subwoofer

The subwoofer on my Z-2300 seems to be broken. The satellite speakers work fine but the sub is not audible during normal play, even with the bass setting as high as it will go.

It is not entirely broken however. If I unplug the satellite speakers and turn the volume up to max the woofer can he heard feintly. I have checked all the computer settings and I am sure it is not a problem with this.

Is something wrong with the amp? If so is it fixable by a professional or is it time for a new system? (it is out of warranty 3 yrs old)

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I had the same problem until I decided to plug the speaker system into my desktop instead of my laptop. Now, all is well and I had to turn the bass control almost all the way down... I was shaking the house! Must be something to do with the quality of the laptop output.

Alex

Posted on Dec 17, 2008

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Why does it play and stop but monitors work fine?


Some subs are switched on and off according to the level of the input signal. The purpose of the switching is to prevent initial "pops" and sub-audible pulsing from damaging the speaker. To the listener, however, it creates the sensation of a sudden loss of hearing followed by restoration.

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Why does my MCS sub 10 not turn on?


Is that the right part number, MCS 10, and not MCS100?

The MCS systems use a basic sub which is matched to the satellites. There's very few controls other than level on the MCS100. So as long as the power light is illuminated the there's very little other than the volume control that could be set wrong on the sub. So what it comes down to is either

  1. a blown fuse (no power at all at the sub);
  2. a broken input (#1 cable, #2 sub input socket, #3 blown sub plate amp);
  3. incorrect connection at the receiver end or the wrong settings

As a quick test, unplug the sub cab from the amplifier/receiver end. Switch on the sub and turn the volume down all the way. Briefly put your finger across to short the RCA/phono tip and ring. The sub should make a buzzing sound. You now know that the sub is working and the cable appears to be okay

Switch off the sub and reconnect the phono/RCA to the sub out socket on the receiver. You now know it is connected correctly.

Go in to the receiver's menu and check the speaker settings. Is subwoofer present? Yes/No

Are the satellites all set to Small? (they should be with this system)

Are you playing a 5.1 source in DD or DTS to ensure that the sub gets a signal? Play a BD or DVD.

On the speaker balances, is the sub channel set to 0dB?

As long as all the above is set as listed, then the only things stopping the sub working would then be insufficient volume at the sub's Vol control (so increase it), or an intermittent cable connection (wiggle the cable), or a broken subwoofer out signal at the receiver.

Aug 06, 2014 | Boston Acoustics Audio Players & Recorders

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My powered subwoofer no longer works through the receiver


if you have your front and centers set to 'small' you want your Bass out to be subwoofer only, and the rca jack labeled 'sub out' is the only place to connect your sub to if you want to control the frequencies with your reciever. I dont know the brand of your sub, or the inputs on the back of it to advise you where to connect, but it sounds like it worked for you at one time, but suddenly it does not

Mar 05, 2013 | Audio Players & Recorders

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External subwoofer doesnt play any sound


Hello,

Are you plugging the sub into a 3.5mm jack or USB?
Have you tried to plug the sub into the speaker jack?
The sub works on another computer?

Bad sub or bad jack?

I hope this helps!

Jan 22, 2013 | Dell Inspiron 1545 Notebook

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My subwoofer isnt working


it is completley possible that your sub has in fact blown itself out mine has some CRAZY excursion to the point ive turned down the bass on my laptop in hopes to keep it alive so order a new sub SPEAKER if the speaker works the amps FINE

Oct 26, 2012 | Cyber Acoustics CA-3001 Computer Speakers

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My wharfedale sw150 subwoofer cuts out in normal viewing, any suggestions


If your Wharfedale sub is powered, it gets its input from a subwoofer output on the rear of the Sony. At a certain level, your sub is turned on and sounds just fine until the level decreases during quiet passages of music then it turns off. I believe the theory is that this approach prevents start-up "pops" but in practice it is a poor solution. I have had several subs that have acted this way. I don't know of a way to fix this short of eliminating the level-controlled turn-on circuit

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Is there a way to use the Altec Lansing VS4121 Subwoofer as a stand alone?


Normally these low end systems components that depend on each other and cannot be interchangeable from other system. So if one of the components (sub woofer or right control satellite speaker) breaks or gets lost the whole system is unusable...
I was in the same situation. Got a sub woofer from VS4121 without original satellite speakers. I acquired satellite speakers from Altec Lansing 251 which used same connectors but the internal wiring was different and incompatible out of the box. Speakers are also glued together so it is impossible to open without damaging it. Not to mention there is no service documentation anywhere..
But if you like electronics you can try to make something based on the information bellow:
Altec Lansing VS4121 connector pinout
If you take the male connector (from right satellite speaker) and look at the pins and number them first row from left to right pins 1-3, second row pins 4-7, the bottom row pins 8-9 and the circle enclosure as 0
0 - Ground
1 - Speaker Right
2 - Treble (seems just like voltage control but may need to be confirmed: Min=0V; Max=voltage from Volume control Pin 9)
3 - Head Set Right
4 - Bass signal (not sure what the exact original design is as I have not opened the speaker) But seems like they use 50K potentiometer and some sort of RC low pass filter configuration. When potentiometer is set to Min it is shorted with ground. When set to Max it is taking signal from Right and Left Head Set (pins 3 and 5) combined through some larger resistors and low pass filter.
5 - Head Set Left
6 - Ground for Head set (grounds 0 and 6 seems to be connected in the subwofer but within the right satelite speaker they seem to be isolated with separate leads to sub)
7 - Power ON/OFF. When OFF or head set jack plugged = 0V; When ON and head set jack unplugged = 5V
8 - 5V Power in
9 - Volume (min=0V; max=5V). It seems they use 50K potentiometer but probably anything >10k should work.
At minimum for standalone sub woofer you will need to implement:
- Power On.Off (switch between pins 8,7)
- Volume control (50k potentiometer (probably anything beteen 10k and 50k will do)between pin 7 and 0 with variable output to pin 9
- Bass control - join two resistors R (I used 7k) and lets call this join point A. Attach other ends of the resistors to pins 3 and 5 respectively. Attach 50k potentiometer (I used 10k) between point A and ground 0. Attach Variable pin of the potentiometer to pin 4 (Bass input signal). Attach capacitor C between Pin 4 and Ground pin 0 (I used Electrolytic 1uF with negative end to ground) . Resistor R and capacitor C should make simple passive low pass filter (Google for formula) that should bypass anf frequency higher than 80-120Hz to ground and feed frequencies lower than 80-120Hz to pin 4.
PS: I managed to hack 251 control satellite speaker to somewhat work with VS 4121 Subwoofer but that is another subject. All electronic parts were salvaged from old broken TV so total cost was $0 but took several days of tinkering for speakers that I could buy used for $10-20 :)

Jun 25, 2012 | Altec Lansing VS4121 Speaker

1 Answer

What do the phase and cut off controls do,manual does not explain much.


Phase reverses the polarity of the driver so it can be matched to the other speakers and bass-reinforcement characteristics of its position in the room. You don't want the sub 'sucking in' while other speakers are 'pushing out' or a bass cancellation will occur.

Set it, listen to bass from your normal seating position, reverse it and observe if the bass gets subjectively better. Leave it in the 'better' position.

Cutoff is a variable for the highest frequency where the speaker 'cuts off'. You can experiment with adjusting it for what sounds to you like the smoothest transition betwen the sub and the othere speakers. You don't want a lot of audible overlap where the sub and other speakers are acting on the same frequencies. It may sound to bassy in that area.

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1 Answer

My satellite speakers are no longer working, logitech do not issue replacement satellites. Do you know if their is a way to use alternative sattelites with the subwoofer?


the back of the sub has 2 rca connections for left and right speakers so all you have to do is either find satellites that use rca connections or find or make your own "clip-on" or detachable wire to rca connection.

Dec 24, 2010 | Logitech Z-2300 Computer Speakers

1 Answer

The left satellite has stopped working, sound does not come of it. The left one works fine and so does the subwoofer, however the on left one not working is becoming very irritating.


Have you checked if the amplifier is working??? Maybe the saund generator (Compiuter, TV etc.) is set to only play on left, check balance, and CHECK THE CABLES

Aug 10, 2010 | Logitech Z-2300 Computer Speakers

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