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McCormack DNA-1 Rev A question

I was fortunate enough to have purchased a DNA-1 Dlx Rev A from a fellow Audiogoner. The amp that it replaced is a DNA-1 Deluxe. Yes, I am moving up the food chain, and boy does it taste good. The question I have is what is the purpose of having 2 sets of Cardas binding posts for right and left channel? I know this is a 2 channel amp. I just connected my speaker wires to the bottom set of posts. My original Deluxe only has 1 set of Cardas binding posts on the bottom and it looks like there are some screw type of binding post above that. I couldnt figure this out so I had to ask. Thanks for your responses
bjue
swampwalker's avatar
swampwalker
5,138 posts
 
The second set of binding posts is for shotgun biwiring, if your speakers have separate posts and IF you want to go that route. 1 set of speaker cables to the woofer posts and a second set to the tweet/mid posts.
stevemcx
166 posts
 
Exactly right - thanks, Swampwalker.

Best regards,

Steve McCormack
SMc Audio
unsound
7,318 posts
 
Swampwalker, just for clarification; I thought "shotgun biwiring" is when there is one + and one - on one end of a channel of speaker cable and two + and two - on the other end of the same channel of speaker cable. I thought what you described is typical biwiring, either with seperate dual individual runs of speakers cables for each channel with one + and one - at both ends of each dual run, or combined/connected runs of speaker cable with two + and two - for each channel at both ends.
swampwalker's avatar
swampwalker
5,138 posts
 
Unsound- I guess we all have different ideas of the semantics involved. If you go thru the various threads on this, you will see lots of confusion and if I contributed to it, I apologize. One way to perhaps differentiate is to call them internal or external bi-wiring. Internal, in my mind, is a single + & - at the amp end and separate + & - at the speaker end, one set for the woofer and one set for the mid/tweeter. External bi-wiring is two completely separate runs from the amp. Now they can be on the same amp binding posts, but that can be ergonomically difficult. Or each of the two separate sets of cables for each channel can originate from a separate set of binding posts which is easier to implement for the consumer and less likely to result in shorting across the amp's binding posts.
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