20 Most Recent Boston Acoustics MCS 90 Horizon Series 5.1-Channel Home Theater Speaker System Black MCS90 Questions & Answers


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.

Boston Acoustics... | Answered on Feb 26, 2016


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

Boston Acoustics... | Answered on Dec 12, 2020


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.

Boston Acoustics... | Answered on Apr 15, 2019


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.

Boston Acoustics... | Answered on Jul 02, 2018


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.

Boston Acoustics... | Answered on Mar 12, 2018

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sub woofer not turning

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