So i just finished mounting my new Ruck fan (150mm/6 Inch 470m3) . I have now connected it to my "Primair" speed controller, & my problem is that when set to any speed but high it makes a buzzing sound (not the sound of the air wooshing through the fan, but an electronic buzzing sound from the fans internal circuitry, though the speed controller is fine). Is there any device on the market which will kill the noise totally?
I have a great cabinet setup in my room but the noise will definetely keep me awake during the night.

Do you know of any device(s) which will stop the noise but not make a difference to the speed of the fan?

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Yes, a silent fan. Whats the point in buying something to make a noisy fan quieter? BUy a silent fan!

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I did consider those fans but they cost £300 and weigh over 10kg, I needed to mount it on top of the cabinet which wouldnt have been able to support it. But then again its the electrical buzzing sound which is the problem not the sound of the air passing through the fan (you know that swooshing sound).

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In the Uk good bathrooms are now fitted with 4.5inch silent fans and cost about £30 or $45 and weigh nothing. I suggest you do a little more research.

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Seriously?
I searched for fans which are in the specification of 150mm/6 Inch 470m3 but had no luck, anyway do you happen to know of anything I can purchase to reduce the noise?

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i know exactly what your talking about. A friend of mine has a speed controler too. Nothing you can do man, its how they work.

Click to enlarge 100mm Silent Bathroom Extractor Fan - BasicPart no: SR100R

Accessories Delivery info£32.25 The SR100R is designed for bathroom installation either to replace an existing extractor fan or as a new appliance. It is designed to operate as a ‘basic’ fan meaning that it’s operation will be a simple on/off mechanism. This is usually done in conjunction with a light switch but can be wired to an independent on/off switch if preferred. IP24 rated, the SR100R fan can be installed in a wall position in Zones 1,2 and 3 or ‘outer zones’ of the ‘wet’ room area.
100mm basic silent fan.
70% less noise than conventional fans. The Silent Range has been developed in response to customers who want to eliminate the nuisance noise of good ventilation.

• Dimensions: 100mm
• Safety Zone siting: 1, 2 & 3
• Integral Backdraught Shutters: Yes
• Timer: No
• Guarantee: 3 years Manufacturer Guarantee
• Stock Item: Yes

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Veni Vidi Vici - I came I saw I conquered.
Gaius Julius Ceasar

Thanks Woomeister, but I already have the Ruck fan mounted, just finish yesterday night so if anyone has found any add on accessory to kill/reduce the noise please POST HERE FIRST.

Thank you

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try hooking the fan up without the speed control, no more buzzing

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you can get something to get rid of that electric current noise, about £50 on ebay, search for inline fan controllers