Question about Wharfedale SW150 Subwoofer

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My WHARFEDALE DIAMOND SW150 SUBWOOFER does not work. the light (red) comes on when connected. but no sound. I've tried direct from speaker and from receiver connection. doesn't work. Any advice

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After finally finding the circuit diagram for the Wharfedale SW-150 sub woofer, I've managed to identify and fix a fault which has the same symptoms as yours.

The problem was with the largest of the two relays (Relay 1 in the attached photo).

My WHARFEDALE DIAMOND SW150 SUBWOOFER - wharfedale-diamond-sw150-subwoofer-p251q2jbxgw5dhyonjje5nyi-1-0.png

The circuit has two power rectifiers, the first rectifier provides the small current for the system to operate in standby. Relay 1 is normally closed and this turns on the secondary power rectifier that powers the amplification circuit.
Relay 2 (smaller and black) is used to prevent the speaker from popping every time the auto-power switches on/off, it uses a delay to allow the amplifier to stabilize before activating the relay which connects the amplifier to the speaker.

On my system the power LED was lit, but the little click that happened about 2 seconds after power-on, was no longer heard. The little click that was missing is the sound of the smaller relay connecting the speaker. This relay was not activating because the amplification circuit had not been powered.

The larger relay does not need to activate to turn on the amplifier, as it is normally closed, meaning the the default connection state is to provide power to the amplifier. The relay is only used to disconnect the amplifier when the auto-off feature kicks in (or the system over heats). I could test this relay was clicking by connecting pins 1 and 3 on the temperature switch connector.

So the relay was not connecting properly in the closed state. This is what the relay looked like on the inside.


Posted on Sep 02, 2016

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  • Wharfedale Master
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There may be an open internal fuse

Posted on Aug 28, 2016

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5 Suggested Answers

6ya6ya
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Posted on Jan 02, 2017

  • 238 Answers

SOURCE: Yamaha YST-SW150 Subwoofer

hi, is it a humming noise ??? check if the connector is plugged in properly,check the earthing, if its a three pin mains plug, if its a two pin, then the CPU SMPShave a proper eathing. let me know

Posted on Jan 12, 2008

  • 1 Answer

SOURCE: Wharfedale Modus One

The tweeters are probably blown, i had the same problem.
You can test this by placing the cable on the dismanteled crossover at the back of the speaker. colour blue/yellow.
No high volume please.
See http://www.hometheatershack.com/forums/diy-speakers/4549-wharfedale-modus-one-six-crossover-pics.html
for pictures.
If the tweeter is blown it can be dismanteld with the aid of a screwdriver, horizontally.
Place it between the tweeterbowl and the ring which has the mark wharfedale on it. The tweeter comes loose. On second hand sites you can buy little speakers, like modus one or two's with the same tweeters for a good price and put them on your larger speakers.

This how i repaired 2 of my 4 modus eights.

good luck Danny Mol
the netherlands

Posted on Mar 11, 2008

Ganx
  • 113 Answers

SOURCE: Wharfedale 10inch cude subwoofer that has a feedback hum when con

Hiya, try a different input cable (from amp to sub) if you have make sure that is ok.

Failing that if there is an earth in the plug, try to disconnect that (earth loop) - unlikely but hey electronics.... anything possible :)

If still there with new cable, earth off etc, then the Yamaha could have a problem but find that difficult to swallow...

Let me know if helps, see any other possibilty
Best of luck

Posted on Jul 14, 2009

  • 34814 Answers

SOURCE: my wharfedale sw150 subwoofer cuts out in normal viewing, any suggestions

If your Wharfedale sub is powered, it gets its input from a subwoofer output on the rear of the Sony. At a certain level, your sub is turned on and sounds just fine until the level decreases during quiet passages of music then it turns off. I believe the theory is that this approach prevents start-up "pops" but in practice it is a poor solution. I have had several subs that have acted this way. I don't know of a way to fix this short of eliminating the level-controlled turn-on circuit

Posted on Sep 28, 2012

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Hi i" ve bought on


This may help. If it's not the exact model you have it will at least get you started as subwoofers are pretty much teh same for connection and operation.

http://www.wharfedale.co.uk/Portals/0/PDF_Data/Manual/DIAMOND9_range.pdf

Others here...

http://www.wharfedale.co.uk/Support/Download/Manuals/tabid/71/Default.aspx

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Apart from the "line input"


input and output are for low level ( as with RCA cable connectors) ,, the speaker connections are for high input, (red and black connections. ) you can run the mains to the (rca) from your receiver to run the sub woofers, and from that use the speaker wire connections, to go to the left right speakers, (out only not in) this is done if you want to run the subs and the Rt/lt/ speakers , eliminating the speaker connections coming from the receiver. which you could use for 2 additional speakers if you want

Apr 23, 2011 | Wharfedale SW150 Subwoofer

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It lights up but does not produce any sound,thamks


Possible that the fuse has blown or the power amplifier is defective. you will need to remove to check even to check the sub woofer coil for continuity - if the coil has opened up or is damaged.

Mar 08, 2011 | Wharfedale SW150 Subwoofer

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Can I connect my floorstanders to wharfedale sw150 without any external amplifier, If so, how ?


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Its internal amp is for its own subwoofer ONLY, but if you use your own amp's full-range speaker-level outputs to feed two chanels entering the sub you can tag the 'floorstanders' onto the sub's speaker terminals as speaker wire extenders. Your amp will be powering the floor units.

I'd keep the sub separate and feed it LFE only if it was mine.

Feb 02, 2011 | Wharfedale SW150 Subwoofer

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Hope this helps.

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