Question about Mordaunt Short 309W Subwoofer

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Mordaunt Short Avant 309i subwoofer set-up

I suspect that this is not a simple answer but before I purchase I'd like to know the facts My home cinema system uses 2 MS 903i rear surrounds, 2 904i floorstanders and the 905i centre speaker. I love the speakers. I now want to add the MS 309i sub woofer which I am assuming should fit seamlessly. However unlike the speakers the sub has to be configured, using the various different settings. 1. Volume 2. Notch filter 3. Frequency 4. Phase In simple terms - how do I do it?

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Re: Mordaunt Short Avant 309i subwoofer set-up

Lots of ways. To set it up properly you will need a decibel meter, Radio Shack makes a nice one. With the meter volume can easily be set as well as phase. I'm assuming frequency is the crossover frequency, generally set at 80Hz. This one involves some trial and error as I am not familiar with your speakers. Don't know much about the notch filter. A good resource for setting up subs can be found at:

Posted on Jun 22, 2007

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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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