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Sony AMP/Subwoofer Problem

Hello, i was wondering if i could find some help here, i have a sony amp and sony subwoofer, for about 1 and a half years now i had no problems with this combination, but lately everytime i play music, a game, a movie, the bass of the subwoofer will cut out, then it will come back in, but it never happens in the same spot or with the same song, it just happens randomely. I'm not sure if the problem is the sub or the amp. Others speakers connected to amp do not have any problems, although the subwoofer has a specified plug in. I have read places that maybe the amp gets to hot and causes this, but that cant be the case because it hapens right away when the amp is turned stuck on this problem, the warranty is done, i just need to know a good direction to go, do i ned to replace some something inside the amp??? or sub?

Thanks so much for you time!!

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  • Evan Boudreau Jan 26, 2008

    thanks for quik reply!!!, but im wondering if its the amp itself,,,,,i tested the sub with another amp....that doesnt have a specific sub output, and it seems to work fine, i just dont want to use that amp for it because it doesnt sound well used with a non sb output amp.



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For me it,s the amplifier had a problem, if your amp is a 4 channel output the rear 2 channel is for sub woofer driver. if it is a PWM amp and you laod a 2 omhs into sub output maybe that's the cause to burned transistor output because 2 omh stable is not ideal to used it's always 4 ohm to avoid some trobles

Posted on Oct 01, 2011


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Posted on Sep 25, 2008


There are many parts inside of the subwoofer box that can cause this problem. First you will need to remove the subwoofer speaker from the subwoofer box completly, there should be no wires from the subwoofer box attached to the speaker. Take any single one-point five volt flash light battery (1.5 volt flashlight battery) and connect the side of the flashlight battery that mark minus (-) or negitive to the side of the subwoofer speaker terminals that mark minus (-). Next connect the other side of the flashlight battery that mark + to the other side of the subwoofer speaker terminals that mark + (plus or positive). When the + wire of the battery make contact with the + terminal of the subwoofer speaker, the subwoofer speaker paper should move forward away from the speaker. This forward movement of the speaker means that the speaker is good and that it is also in phase. Next you will need to connect the - minus and the + plus wires from the battery terminals permanently to the subwoofer speaker terminals. By removing and re-connecting the two wires from the flashlight battery to the subwoofer speaker terminals which is the - minus wire from the battery to the - minus speaker terminal and the + plus wire from the battery to the + plus terminal of the speaker, the speaker paper should move forward and stay forward and when the speaker move forward try moving the subwoofer speaker paper forward and backwards two to three times you should not hear any carckling coming from the speaker. Make sure that when you are moving the subwoofer speaker paper forward and backwards the wires on the battery and on the speaker terminal are not moving. If you hear any carckling comming from the speaker when you are moving the subwoofer speaker paper. THIS MEANS THAT THE SUBWOOFER SPEAKER HAS AN INTERMITTENT PROBLE OR THE VOICE COIL WIRE IS BROKEN. Check all subwoofer wires, plugs, jacks and wire connecting points inside and outside of the subwoofer box for good connection. When the speaker is playing it will vibrate the box. This vibration can cause wires, plugs and jacks connections inside and outside of the subwoofer box to come loose or not making proper connection. A loose connection in side of the subwoofer box or outside of the subwoofer box can cause this problem. Make sure that electrical power cord that brings the electrical power from the wall outlet to the subwoofer jack is good and it is also a good idea to replace the electrical power cord. Make sure that the electrical power cord is push all the way in, into the subwoofer jack and make sure that the plug on the other end of this same subwoofer power cord is push all the into the wall outlet.If you use an electrical extention cord to bring power to the subwoofer you should use one that has a ten gauge wire or one that is large. You can find a good electrical extention power cord in a local hardware store or you can locate a good electrical power extension cord at a radio shack store. This electrical extention power cord must able to carry 15 amps of electrical current continously. A small electrical power extention cord can give your subwoofer low voltage which is any electrical wall outlet voltage which is below 108 volts. Proper electrical outlet voltage should be between 110 volts and 132 volts. The amplifier inside of the subwoofer box could have loose transistors, I.C.,s resistors,capacitors, volume control adjustmens and even a broken or losse copper trace which is use for carring the electrical voltage and current. If you check every thing that I have mentioned above, then the amplifer inside of the subwoofer box is defective or broken. MAKE SURE THAT YOU REMOVE ALL THE ELECTRICAL POWER FROM THE SUBWOOFER BOX BEFORE YOU REMOVE THE SPEAKER!

Posted on Apr 04, 2008

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It is probably the tweeter, inside the Sub. it's the small ceramic disk between the cone magnet, and the speaker. id this thing is cracked or broken, this will cause the problem. if this is not it, then it is a problem with something in the wiring, and the only way to rectify it is to buy a new sub. Sorry due :(

Posted on Jan 26, 2008

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