Hello just bought Devolo dLAN 500 Duo Starter Kit... Which are good.. But I have them set up in the bedroom.. And I know this might sound abit picky but they make a high pitch drone/tone when in use.. So I was hoping maybe some members might be able to help and either tell me some silent ones.. (Stress silent because the one I have ain't loud just can hear in bedroom ) or better ones looking to spend up to ?80..has to be 500mbs.. Thank you for your help