Audio System 100V

[normanton]

Hi there, I recently purchased the Adastra 240s amplifier. I have 4 bedrooms. I have run a 4mm 2-core cable from each room back to the hub (where my amp is). I have connected each cable into the amplifier (positive to 100V and negative to COM) so that each room is a separate zone. On switching the amp on, all I'm getting is a buzzing noise which gets louder when you increase the master volume coming from the one bedroom. I'm an electrician so my knowledge of audio systems is basic. Do you have any idea of here I'm going wrong please? Amy help would be much appreciated, Lee

 

[Lucien Nunes]

If the buzz is on one input only and is affected by the volume control, it's almost certainly localised to that input's wiring, e.g. a disconnected screen. What is the audio source in that bedroom and how is it wired to the amp?

BTW, 4mm² for 100V line? the whole point of 100V is that you can use any old bit of wet string...

 

[davesparks]

4mm? We use bell wire!

 

[UKMeterman]

Could you please sketch it out somewere?

How long are the input cables and which inputs have you used and what are the sources?