[mythtv-users] HDMI-to-CAT5 Converter

Bob spam at homeurl.co.uk
Mon Feb 18 05:56:33 UTC 2008


David Brodbeck wrote:
> On Feb 15, 2008, at 12:29 AM, Bob wrote:
>   
>> you only need 4 wires to power 3 speakers as negative is common, (or
>> neutral or black whatever you want to call it) you should check this
>> first but I've not had a problem with the 3 installs I've done this  
>> way.
>>     
>
> Be careful.  Not all amplifiers have a common ground for all the  
> speakers.  Some use push-pull final stages where the negative terminal  
> is *not* at ground potential and is *not* the same for all speakers.   
> I suspect this is more common on car audio equipment than on home  
> systems, but in theory any amplifier *could* be wired this way.  If it  
> is tying the negative terminals together can cause distortion or even  
> damage to the amplifier.

Absolutely, it's vital to check with a multimeter, but the point is it's 
the easiest way to wire up an A/V system with a projector as the run 
between video source and display device is short, the only long run is 
to the front speakers, and you can use cheap copper from the hardware 
store for that.



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