Just received my gear (AV1RS and AV3S), now all the M130 seem similar, but I know that two of them are 8 and the other two are 16 ohms.
Look at magnet size of them compared to each other. The one's with the larger magnet is the 16 ohm version. The smaller magnet size are the 8 ohm version. Sorry, I usually write something on the packing.
One of the tweeters had the indication of AV1RS. Is that incation for any reason, or all the tweeters are the same ?
All of the tweeters are the same. They are all tested and measured. Then they are then grouped into near identical pairs. So that when anyone orders a pair of speakers or a pair of tweeters they are a matched set.
Keeping looking and you'll see that one more tweeter says A/V-1RS. I write that on there so that you will know that pair is for those speakers. They are a matched set of tweeters.
The one that says nothing on it is for your single A/V-3S center channel speaker.
With our new version 7.0 Clio measuring system we are now storing the response curve for each tweeter sold.
So if you kid ever sticks his tinker toy through one of your tweeters and destroys it, we can look up the response curve of it and send out another near identically matched tweeter.
