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Subwoofer Module N-200 ( Nuance ) Short on circuit board

I have a Nuance subwoofer module N-200 with a short on the circuit board does any body know how to fix or replace the board.

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Re: Subwoofer Module N-200 ( Nuance ) Short on circuit...

I'm working on a guys board looks like it is the Q10 and Q1 transistors I'll let you know how it goes.

Posted on Nov 20, 2008

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Re: Subwoofer Module N-200 ( Nuance ) Short on circuit...

I have for sure one working N-300 amplifier and maybe a second (Depends if I can repair it, I think I know the problem, just waiting for parts). I am willing to take offers. If interested email me at

Posted on Dec 23, 2008

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Subwoofer blows fuse

Short circuited component/s at its circuit board. Check and replace it. Check for shorted component/s at the amplifier stage circuit. If you wish to get some details; check the site linked here. Pull up older posts. Surf the site with patience.

Dec 06, 2015 | Boston Acoustics Speakers & Subwoofers

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MCS 160 Boston Subwoofer ZD3 Zener Diode Value

ZD3 is a 18v zener. Also check the surface mount resistor on the back of the board that is attached to ZD3, I think it is R9. Should be 10 ohms. This resistor sometimes opens when the diode goes short.

Jul 13, 2013 | Speakers & Subwoofers

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The fuse of Jamo Sub-200 gets blown off. is there anyone who might know the reason. thanks

try replace the blown fuse with ampere and check the sound if still ok.
some fuse got blown if the load current exceed. maybe high volume can cause the high current.
other cause by short circuit coming from the amplifier.

Aug 26, 2011 | Jamo SUB 200 Subwoofer

1 Answer

Unable to receive optimum output. The bass is totally flat !

Hi, ok the Bose Acoustimass III system consists of two small cube speakers and one subwoofer unit called the Acoustimass bass module. If the subwoofer stops working, three points can be the cause of the failure. The Bose Acoustimass III is a passive system, meaning the speakers do not power themselves, but instead are connected to a receiver or amplifier. Thus, the amplifier, the speaker between the amplifier and the subwoofer, or the subwoofer itself could be the issue.

Things You'll Need:

* Amplifier
* Speaker cable
* Extra subwoofer


Disconnect the speaker cable from the back of the Bose Accoustimass bass module and connect it to a subwoofer that is known to be working. If the subwoofer works, the bass module needs to be replaced.

Disconnect the speaker cable from the back of the receiver or amplifier you are using and from the back of the subwoofer in Step 1.

Connect a speaker cable that is known to be working between the back of the receiver or amplifier and the back of the Accoustimass module. If the module starts working, then the cable was the issue.

Disconnect the speaker cable from Step 3 from the back of the amplifier or receiver, then connect the cable to the subwoofer port on the back of an amplifier or receiver that is known to be working. If the subwoofer works, the receiver was the issue. If the subwoofer still does not work, verify that the speaker cable is in the subwoofer port of the receiver/amplifier and that the cable is connected securely to the subwoofer.

If you think you did the connection properly,Fine... If not you can use the manual from the below link and know how to connect it properly..

Have a nice day..

Feb 19, 2011 | Bose Acoustimass 5 III System

1 Answer

Electrical short in the subwoofer

You're quite right when a fuse blows there's a short. The short will be in either the power supply section, or the main amp. You will be looking for a semi-conductor of some sort. A multi meter on the ohm setting will track it down quick if it's a transistor. As the meter scale will be just like you have touched the probes together. Follow the circuit back from the fuse. Check any part that you suspect. If the sub uses an IC power amp, it could be a strong suspect!

Jul 11, 2010 | Onkyo SKW-210 Subwoofer

1 Answer

I blew the circuit board on my jbl pb12 subwoofer. how or where do i find a replacement and is it expensive or a cheap part to fix/replace?

Sorry to hear that. The JBL PB12 are notorious for their amplifier module giving out. This item is not repairable nor is there a replacement (The module is potted into an aluminum heat sink). Actually, I need to clarify, as the late models used discrete components. If this is the case, either Repair it yourself (Google search PB12 Repairs) or take it to the local repair shop. (Or to a technical college with an electronics program, they may work on it!)

The best method is looking for a plate amp to replace the PB12 Amplifier - try the bash 300W. Several people have done this conversion. Be warned, you will need to do woodworking if you want to mount the plate amp on the box!

Mar 01, 2010 | JBL PB12 Subwoofer

1 Answer

Subwoofer will not power up

More likely to have shorted out Class D amplifier module that was badly designed.
Here are the service manuals:

I modified my using Linear Amp IC from TI, bot the same power but loud enough for me.

Jan 17, 2010 | JBL PB12 Subwoofer

1 Answer

Hello I have a subwoofer and the fuse blew out. I replaced it with the same kind, but its still not working. The power light is on. When I turn it on it doesn't make that first thump sound. is it fixable?

It is very much fixable. Check if the fuse has blown again. And if it has, there is some problem with the circuit. Check conitunity across the main filter capacitor. If it's short, disconnect amplifier IC's power lines and check across the pins if it's short. In case it's short, you will need to replace the IC. But before replacing check all the rectifier diodes.

Dec 23, 2009 | Polk Audio PSW12 Subwoofer

1 Answer

Audiosource AST-Sub 10 subwoofer. it blows the fuse when turn on.

It sounds like your audio amplifer has a short (probably the out put transistors or module). This should not be an expensive epair.
To check your speaker you can use an ohm meter. First, pull of one of the two wires that connects at the speaker. You should read 4 to 8 Ohms. Also you will hear a little pop through the speaker as you touch the wire. You can also use a 9 volt battery in the same way.
Good Luck

Jul 25, 2009 | Speakers & Subwoofers

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