AirCo causes heavy interferences to my MF A300

[admin_exported]

Hello

I've owned a Musical Fidelity A300 for around 7 years now, I use now to power-amp front Spekers from Sony AVR. This is to say I use my sony AVR to feed rear and center spekers and the A300 as power-amp my front Nautilus 805.

I have just intalled a brand new Air Conditioner (Mitsubishi Heavy Industries, brand new) in the room and any time I connect it (for cool or warm) it produces a strong noise in the front spekers. If I switch off the A300 I can still hear a very soft interferece in the rear spekers but the heavy noise comes up when I switch on the A300.

I need to warm or cool the room (with the Mitsubishi) and then I switch off the AirCo and then I switch on the HIFI, as they can not live together. This as you may guess it is quite cumbersome.

Can you please give me any idea of how to filter out this noise (maybe there's any kind of device) or shall I contact MF or Mitsubishi.

Thanks (Sorry for my English)

 

[idc]

Your issue sounds ripe for a mains conditioner. Your English is fine, where in the world are you?

 

[Anonymous]

Thanks

I was expecting a sort of solution like that. It seems that the interference comes from the outlet, it is not a RF interference.

The problem is that I have been suffing the web and I have found products from Isotek, Furutech and Audio Agile but they are damm expensive, some go up to 3000 ?, some costs1200 ?, 1500 ?. That's crazy. I wonder if an average surge protector could do the job, I can find a decent one for 30 ?.

Surprisingly going over the 9 pages user guide of the MF A300 they mention this:

WARNING - Radio Frequency Interference (RFI)
This hi-fi product has been tested to ensure that its operation will not be adversely affected by
normal background levels of RFI. It is possible that if this product is subjected to abnormally
high levels of RFI the unit may be susceptible and not perform as expected. In the unlikely
event of this happening on a regular basis, please contact Musical Fidelity's service department.
The unit has also been tested to ensure that it does not radiate excessive levels of RFI that could
affect other pieces of electronic or electrical equipment.
The electronics in modern hi-fi equipment is complex and hence may be damaged by lightning.
It is possible that during electrical storms the operation of some equipment may be adversely
affected. For complete protection of your hi-fi system during such storms, mains plugs and aerial
leads should be disconnected.

I am based in Madrid however I have not been using English in five years.

Thanks

 

[idc]

For that price I would avoid mains extensions from Tacima as there are many reports of them strangling amps sound. I would look for plug in mains conditioners that would go into a spare socket next to or near your hifi, between it and where the mains are that power the aircon.

look on ebay for products such as the Russ Andrews Silencer and similar. Example here

 

[Anonymous]

Thanks for your help.

I have been looking at the products you mentioned, I think it is a good starting point.

Strage thing the silencer, as it has to be placed into a spare socket, I can't understand how this work. As for me, it had to be placed either at the souce or recipient of the noise, but not "next to". Anyway I may drop a line to them to make sure that it will fit my needs

BTW if you have a look to the Russ Andrews main conditioner they also cost a fortune (at least for me 1300 Pounds)

Thanks again

 

[idc]

Some RA stuff does cost a fortune. The cheapest mains conditioners are the plug in devices. Tacima and Isotek make similar products. I suppose an issue for you is finding one with the right plug type.

 

[Anonymous]

Thanks idc, your help is very much appreciated.

Maybe this device from ISOTEK can do also the magic: http://www.isoteksystems.com/en/isoplug.asp

I still wonder how these things work, as current is not goint through them.

But this post it's only to thank you for your help.

 

[Anonymous]

I have found the same issue for people power-amplifying only the fronts.

http://community.whathifi.com/forums/404880/ShowThread.aspx#404880
I have found now this post related the same issue, what a
conincidence!!! that the three of us we had the same configuration, we
were only amplifying the front spekers. Is it a conincidence, sure it is
not.
But I have and advange, I am using an integrated amplifier
not a sheer power amplifier for my fronts, so I have some extra imputs
to check the noise without being conected to AVR.

I run to my
Musical Fidelity A300 and I connected and ipod to it, and I switched the
AirCo unit on, and guess what?, cristal
clear!.

For the sake of the science I connected the fronts
straight to the AVR, and also no noise.

So the problems it is
not the power amp itself nor the AVR, but sources from the
configuration.

There's something wicked power-amplificating only
the fronts!
Regards

 

[Gwyndy]

Jasabel,

Consider asking an electrician what it would cost to install a dedicated mains spur for the HI-Fi, if it's cheaper than the Mains Conditioner, it may be worth getting one for the Air Conditioner as well.