Question about Logitech Z-560 Computer Speakers

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Shorted Sub-woofer While moving a few things around, the sub-woofer came un-plugged from my PC. Lousy sound came next - think sizzle - and now, no more sound. So, is there something inside the sub-woofer that can be replaced/repaired? Before I pull all the set screws, etc. out? There's no reset or external fude that I can find... Thanks in advance, Monty

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Try this site first; but it sounds as if something has fried in the amp - if you look inside you may well see some burning marks around some of the components. Another possilility is that the cable being pulled out pulled something inside the speaker that has damaged the cone or more likely the power supply , but the symptoms you describe suggest an amplifier issue, possibly caused by damage to the power supply system. Hope this helps :)

Posted on Mar 11, 2007


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Posted on Jan 02, 2017


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1 Answer

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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My Onkyo sub-woofer sounds like something is loose in it or rolling around...the sound is similar to shaking a can of spray paint. When I plug it in to the system it sounds crackly. If i turn the volume...

sub woofers are very powerful bass , with incredible sounding technology. your problem might be with the woofer wall around the circle. open the box and take the woofer out.Check if there is any tare over the corners of the cloth. sometimes there might be a crazy noise because of a little opening in the cloth caused by small tare.. if so better change it with a new 1 and make sure that the new cloth has guaranty
damaged sub woofer eg. images?q=tbn:and9gcqv8lxhmuosnjkfywvef7uujnntmudkhhpl-pghy0i7xushrda- torn cloth- images?q=tbn:and9gctcogf_osbsmo3vmcu1vjnpozksylq4nojwpbojuo3w28zvb3honw
Thanks for rating good luck

Feb 08, 2011 | Onkyo SKW-200 Subwoofer

1 Answer

Some weeks ago the sub stopped working. Thought dog had chewed the coaxial driver cable, but not shorted (now). Tried another sub w/o success.

Hi, I went to the Denon website and they have no documentation there for your receiver.
But do not frown, I have some good suggestions for you.
0 Don't beat the dog. After all, it's their job to chew things.
1 Get a new, un-chewed cable and see what happens between the sub output and the sub woofer. If it works, your in business. If it does not work. Don't be discouraged . Go to step #2
2 If the sub output on the Denon has failed, and everything else is good. There is another way to use your sub.
Install a patch system using the Headphone output from the front of the Denon. It may seem odd, but it works exceptionally well for the following reasons. It works on all signal sources. So if you are not playing a home theater source, you still have the use of your sub.
You will need the following adapters.
1 A Male stereo phone jack to female mini-phone jack. (Something that would accept typical small headphone sets such as those on an iphone).
2 A stereo "Y" connector that that has a single stereo male mini-phone jack that has two "RCA" female jacks.
3 A simple RCA male to male stereo cable pair as is commonly used to connect CD players, etc. i.e. separate red and white RCA connectors at both ends.
1 and 2 above may be available as a single unit combined with each other.
Take these adapters and connect the Item 1 into the Receiver, Item 2 plugged into Item 1, Item 3 plugged into Item 2 and finally the other end of Item 3 plugged into the two female RCA jacks mounted onto the back of the sub-woofer. If the sub only has one female RCA connector, get a RCA "Y" connector that has a single male end to 2 female ends.
This setup will work perfectly with any sub. The reason is as follows. Most decent subs have an adjustable high frequency cut off. So you can vary it from about 20Hz up to about 140 Hz.
I recommend that it is cut off at 80 hz. This way the bass transition is usually seamless between the woofer and the rest of the system. .
Then adjust the woofer volume control in a similar manner.
If it all works out, give the dog a treat and enjoy yourself.
I really hope this helps, I love my sub woofer as well.
Let me know how this turns out.
If you have any questions please post them on the site and I'll get back to you ASAP.
Best Regards,

Jan 22, 2011 | Denon AVR-3600

1 Answer

I recently purchased a new Denon AVR-391 receiver and am having a problem hooking up my subwoofer. It seems that the Denon has a pre-out RCA looking output and my subwoofer uses conventional speaker wire. ...

Your sub-woofer apparently does not have an amplifier built into it. This type requires you to use your front left and front right speaker output to got through it to your regular speakers. It is called a passive sub-woofer for that reason.
To set it up, Connect your front speakers to the "output" of the sub. It should say "to speakers" on it.
Then connect the Speaker Outputs for the left front and right front on your Denon AVR-391 directly to the Sub. It should say on the back of the Sub "to amplifier".
Here is some theory you should know, if you don't already know it, that will help you get a satisfactory result in setting up this system.
There is a condition on setting up all speakers and subs that not everyone know. It's call "phase alignment". Phase alignment (A Good Thing) refers to all of the speakers in a system moving in the same direction (in and out) at the same instant in time. This gives you much clearer sound and better response from your sub-woofer.
Phase Cancellation (a bad thing) is when some of the speakers are moving out and other moving in during the very same instant in time. It causes problems in sound.
Here is how to handle it:
On the back of the receiver the speaker terminal outputs are colored Red and Black. Black is considered negative and Red is considered positive. On the back of the Sub woofer and on the speakers the same colors apply. MAKE SURE THAT ALL OF THE CONNECTIONS GO BLACK TO BLACK AND RED TO RED WHEN CONNECTING UP THE SPEAKER WIRES.
The system will work either way. But you will have severe bass loss if the woofer wiring is out of phase because of phase cancellation.
Hope this helps,
Best Regards,

"Phase Cancellation"

Jan 05, 2011 | Audio Players & Recorders

1 Answer


I found that one of the pins of the plug connecting the sub-woofer was bent and the plug was not seating properly deep in to the slot. Every pin has a specific task to the sound system, it seems. I set right the bent pin with a long needle gently and re- plugged in to the woofer's slot. After that every thing works amazingly. All it requires is patience and application of mind for a while exclusively focused on the problem.
Thanks and regards
M. Narayanan

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