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Post by John Bell on May 11, 2011 8:42:08 GMT 1
Upon RTFM of my new Crown class D digital amplifiers, I was surprised to read that shielded speaker cables are not to be used on the outputs.
I didn't realize that you could purchase shielded cables, until I went to Maplins.
It seems that all of their new stock is shielded, so I went to the Wembley PA Centre to buy some 14 SWG cables, (STAGG).
Anybody know why you would need shielded low noise speaker cable.
It appears to be a rubberized dielectric layer under the thin outer rubber sheathing. There is no "drain wire" connection.
What effect could that have on a digital amplifier?
Cheers, John.
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Post by John Bell on May 12, 2011 10:41:08 GMT 1
I received this reply to my mail to Tom Lureman of Crown Tech Support...
"Hi john, I am surprised to hear they ONLY carried shielded cabled. Shielded cables are not necessary under normal circumstances. The only reason you would need shielded cable is if you were running the wire near very high voltage stuff, or high powered RF devices. Generally, they are a lot more expensive and of larger physical size, but the conductors are usually smaller."
No mention of what it would do to the Crown Amplifiers, but I suspect that there may be confusion between screened and shielded cable.
I have read that the miss-match of the inner conductor and the outer braided screen conductor of a screened cable can be very damaging to valve amplifiers.
John
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