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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 2 responses by jgruff

jgruff OP
2 posts
 
Hey thank you so much for your quick response!

So just to understand this better, the notation here is opposite to that in boolean algebra, where A*B would mean A and B, and A+B would mean A or B?

What is the reason behind these different ratings, i.e. what is different between the two configurations (maybe in terms of the wiring or other internal features) that would cause the different impedance rating?
jgruff OP
2 posts
 
Ah thanks that last paragraph makes perfect sense, thank you.
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