Question about Boston Acoustics MCS 90 Horizon Series 5.1-Channel Home Theater Speaker System Black MCS90

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Sub woofer not turning on

Sub woofer does not power on

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2 Answers

Steve K

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Most likely cause is ZD3 has gone bad. It is known to go short and cause no power in these subs. It is an 18v zener diode. Also, check R9 on the back of that board. It should be 10ohm, but sometimes goes open when ZD3 shorts.

Posted on Feb 26, 2016

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richie46

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Is it receiving power? If not that is your answer - could be a blown fuse, bad wire, bad connection, etc.

If power is there and it still does not work then the problem coud be with a bad sub woofer on/off switch, internal fuse, or worse, blown amp from over driving.

Posted on Feb 26, 2016

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do you have active speakers eg sub woofers powered speakers.they will still make noise if the power is left on. turn off power to sub woofers etc

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How many total watts


Hello
The power rating for this amp is as follows.
Two channel: Sub woofer: Min 35Watts
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Power sub woofer is not working on my pioneer vsx-81txv everything is working all the speakers except the power sub connection at the back all i can hear is the hissing sound when i try to connect the sub...


Hissing? How loud? A sub isn't even capable of making high frequency sounds at normal volumes.

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Page 17 and the MACCV procedures on Page 33 (auto) or 43 (manual)

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I lost my remote control and I want to turn on my sub woofer manually through my receiver. How do I turn on my sub woofer.


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Most powered sub-woofers have these connections, just check it out first before you buy one. They look like speaker jacks on the back of the receiver.

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Hi I own a Technics Hi-Fi system (Model SC-EH780) and would like to attach a subwoofer to it. I cannot find the subwoofer unit that is supposed to go with this system. Can you help?


Any powered sub-woofer will work with it. Check the back of the Technics, make sure there is an RCA output labeled "Sub-woofer" or "Woofer" or "Sub". If so, you can get any brand of powered sub woofer and it will work. A powered sub-woofer is one with an amplifier for the sub built into the box and you will need to plug it into an A/C outlet as well. The only exceptions to what will work with this unit is to make sure you are not buying a sub-woofer that is made to only work with the companion unit it is originally sold with. Many Panasonic and JVC sub woofers are like this. Just look for a sub-woofer that is not part of any system. Velodyne makes some really great sub-woofers that would work nice with yours, but they can be a little expensive, but they are very good.

If your Technics has no RCA output for the sub-woofer, you will need to make sure that whatever powered sub-woofer you buy has a speaker level input for it. Most powered sub-woofers have this feature, so that you may just run the front speaker outputs of the receiver into the subwoofer and then the sub-woofer will have a set of speaker outputs right below the speaker inputs so you can still have your front speakers connected to that and not loose anything from your system.

I hope I have explained this in a manner you will understand easy, if not just post whatever questions you may have right on this thread and I will get back to you as soon as possible.

It would also be appreciated if you could rate this solution if you no longer need any help from me. If you do require more help, please wait to rate this until we are finished. That way I do not get an undeserved bad rating when we have not even finished our communications.
By the way, A "Thanks for trying" and "Helpful" rating are really not good, they always end up lowering my overall score.

Dave

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