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Understanding Speaker Output on Nikko NA-550

Hi,
I'm trying to understand this label on the back of my amp (Nikko NA-550). Specifically I'm referring to this image: https://vintage-audio-heritage.fr/download/file.php?id=57573 .

First off, are these two separate output channels or are they wired to the same channel and just allow switching between two sets of speakers?

Then I'm trying to understand the impedance rating given:
  • what does the notation A.B and A+B mean? I'm assuming different configurations of the speakers and/or wiring. Does it also apply to a single set of stereo speakers or only if using one set per output (4 speakers total)?
  • how do I interpret the impedance rating? Does "4 ~ 16 Ohm / speaker" refer to the allowed impedance range the speakers must be rated at?

Thanks a lot for your help.

jgruff

Showing 1 response by erik_squires

erik_squires
16,644 posts
 
Hey there, this is pretty typical.  Lots of buyers like to run two separate pairs of speakers, but you don't have 2x the circuitry.  The jacks are just there for convenience.

The lower the impedance number, the harder to drive. 

The top line means "A or B" - each speaker can be rated no less than 4 Ohms.

The bottom line means "A _and_ B " - Each speaker can be no less than 8 Ohms.


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