I'm about to pull the trigger on this cable as i need some for my new 5.1 setup i just got. Do i really need 4mm? The longest run from the app is going to be 10-11 meters for the rear speakers and the rest is going to be 1-2meters for the rest. Would the 2.5mm be the same sound quality?
I think 2.5mm will be fine for you. I went for 4mm as I was setting up stereo floor standing speakers and thought i'll pay the extra and never worry about picking the 4mm in first place. The change in speaker cable actually made my speakers louder and more fuller sounding, i'm talking subtle but after 3 days of back to back testing the difference was there. I actually wired one speaker only and was switching left / right on the amp to compare the old and new cables. For 3 days I had one side of my room sounding better, then I eventually wired the other side to 4mm DCSK also, then everything matched up in sound again.
Another thing about the DCSK cable, is it's really heavy (compared to most budget cable), especially in the 4mm, yet it's still quite flexible it's easy trunk around my hi-fi rack. Also when people see the hi-fi rack, the 4mm cable looks quality and it fits in with everything else.
What wattage are your speakers, if there just the regular 5.1 wattage type then go 2.5mm, however if there all premium powerful surround (you have a 5 foot foor standing speaker in every corner!), and your trying to get every last ounce of sound quality, then go 4mm.
Did your 5.1 speakers come with any cable? If so discover what size cable that was and use as a guide. My own personal rule is to go one thicker cable size than what the manufacture supplied, for example my office / computer speakers came with 1.5mm, so I used 2.5mm copper in the office and again I got a subtle improvement in those speakers.
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