Question about Mordaunt Short Avant 907W Subwoofer Speaker

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My Mordaunt-Short 907W has developed a bad habit of humming and buzzing. This low-pitched droning sound gets louder as time passes. The problem has gotten bad enough that I just don't use the sub any more. I have had it in my home theater for several years, but this problem has only recently developed. What could the problem be?

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5 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

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sanjin
  • 56 Answers

SOURCE: subwoofer noise

You didn't say is your sub active or passive.If its active first check signal cables from theater system,power line of the sub, it has to be the same phase as the system.If its passive take a voltmeter disconnect the sub from the system and measure for DC voltage on the SUB output on the system when its OFF.If DC voltage is present your amp is damaged.It can also be that the preamp circuit for the sub doesn't mute the input when unit is on stand by and you hear frequency of your power supply (50-60Hz) on the sub

Posted on Mar 10, 2008

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Ganx
  • 113 Answers

SOURCE: i Have a buzzing mordaunt short avant 916i cone

Hiya, its the cone. The former is touching the magnet inside. Realignment is really tricky and dont know many people who can do that so you may either have to live with it or see if someone can recone it in your area.

Best of luck

Posted on Jul 15, 2009

  • 232 Answers

SOURCE: 309i sub not working

hi ,
2 things to do

1 - the power amp has fail and will need to be looked at
2- your amp could have a sub output faillure

Posted on Jul 15, 2010

rommelalilin
  • 2178 Answers

SOURCE: Hi my name is Ben. I have a Mordaunt Short home

It can be repaired. A transistor shorted and possibly some resistors burned open as well. This is due to an overload causing the transistor to drive hard creating heat and eventually shorting out. The transistor needs to be isolated, removed, and replaced as well as the resistors.

Posted on Nov 12, 2010

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Hi my name is Ben. I have a Mordaunt Short home theatre system which is probably 6 yo but has had very little use. On standby mode, the 309W sub started to make a buzzing sound with intermittent louder...


It can be repaired. A transistor shorted and possibly some resistors burned open as well. This is due to an overload causing the transistor to drive hard creating heat and eventually shorting out. The transistor needs to be isolated, removed, and replaced as well as the resistors.

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