Top 20 Boston Acoustics MCS 130 LCR Main / Stereo Speaker Questions & Answers

mine had the same problem until it completely quit. unplug the sub and turn it over, press gently on the speaker cone, does it move freely, or do you hear a sort of scrapping noise? if it moves freely with no noise, its a dif problem than mine. if you do hear the scrapping noise, then theres a short in the voice coil, from what ive read you have to replace the driver (actual speaker part), its basically blown

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You may have to replace the zener with an equivalent having a heftier current rating.

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Most often this unit goes dead because of zener diode ZD3 shorting. It is a 18v zener. replace this and you should be back in business.

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humming is frequency intereference
problem circuitry, bad wires unprotected wires

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I don't know if you will see this or not, your post was 2 years ago. I have the same problem. My volume is stuck at 24. I have tried soft-reset........among other things. One thread says to turn volume down to 00 then press for 10 seconds. I have no control over the volume, so, yeah, thanks for that fix. I found that I could get the volume down by unplugging it,plugging it back in and sometimes the volume would pop up and I could turn it down one notch. I did it till I got to 00.............thought AHA! My problem is solved! No such luck. When I press the volume at 00 and try to hold it for 10 seconds, after 3-5 seconds it just pops back to the station frequency. I also thought that if I could get into the guts and spray the volume control with tuner-cleaner, it might help. No go.......after taking off the cover, I found a bunch of REALLY delicate looking electrical tapes and wires..........I was scared I would destroy something in an attempt to reach the volume control. I hate to trash this radio, the sound is awesome...............great design on the speaker, NASTY design on the controls. I'd be VERY interested to know if anyone, anywhere, has found a fix for this. I think maybe my next step will be hitting it with a hammer.

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it is designed to only connect to the soundbar

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Fuses blow when there is an overload. The most likely cause is a short-circuited semi-conductor IE: a transistor or IC etc. If you find one of these devices inside it with a heat sink on it, that will be the most likely cause. Transistors can be tested with an Ohm Meter and in a short circuit fault such as this, it will be like you have put the two test probes together!

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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.

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donaldws1018 I was wondering if the static problem was resolved yet. I have a pair of the VR970's that don't sound so good either.

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Have you tried Boston Acoustics web site? Google manuals and see what you get

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Do you mind to take pictures of res locations what you need?

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You may have dislocated the voice coil. Repair shop may be needed.

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As you stated in your question there are 3 3.5mm headphone jacks connected to the speakers. Green is for headphones, red is for microphone, and black is probably just a line in connector.

plug the green connector from the speakers into your headphone port on your laptop and it should work.

because the speakers are self powered and have a few adjustment knobs on them, you will have to tinker with the volume coming from the laptop and from the speakers, so you don't have distorted, scratchy sound from the speakers when playing music at loud levels.

my suggestions is turn the laptop volume down to a quater of the volume and then turn the speakers up, let the speakers do the hard work and not the laptop..

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Go in from the sub plate on the back panel.


and then flip over and remote the driver, followed by the corner screws under the feet for the bottom plate


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always 1 speaker per amp output!!! and between red and black only. You can send any signal into a subwoofer. Hi frequencies will be quiet but it's safe. switch a normal speaker for the sub and listen, you should hear a muffled sound. Look for the sub output on the amp... do you need to switch on the sub manually somewhere?

Boston Acoustics... | 292 views | 0 helpful votes

Did you find the value of ZD3.
I need it too.
I have the same problem, and I take out the ZD3 and the subwoofer works. But I'm not sure that is correct. I think it may be the circuit stand by.

Boston Acoustics... | 1,384 views | 0 helpful votes

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