Correct. The tweeter should oscillate when tapped. This is confirmed in the SL2 set-up manual.
“*As well as being adjusted to sit centrally when viewed from the front, and flush with the front panel, the Tweeter must oscillate freely without touching any part of either cabinet.”
Thanks all for the tips. I’ll realign the tweeters when I’m back home tomorrow.
I’ve arranged to pick up loaner NACA5 at the weekend from my dealer to try out. He advised not to use non-Naim speaker cables with Naim amps and speakers.
The only bit I’m not sure about is the oscillating boxes. When I positioned my SL2s at the weekend, I made sure they sit firmly level on their spikes on the carpet. I can’t see how there can be any movement from the boxes when prodded? (or am I missing something?).
No you’re not missing anything. I had exactly the same thought as I read lots of posts about people knocking on the lower cabinet and making the speaker rock back and forth.
It’s one of those things that is quite difficult to explain in words and in practice it’s less obvious than it sounds.
But - if you give the lower cabinet a firm push you should see the tweeter appear to oscillate. In fact it’s not and it stays still but there is very slight movement of the lower cabinet on its “leaf spring”.
It is not a case of the speaker making dramatic movements.
I’m sure you’ve done this but you should have the spikes going through the carpet onto the floor below. Small slits in the carpet with a Stanley knife really help achieve that.
I’ll probably make slits in the carpet & underlay for the spikes once I’ve decided their final position. I’m still undecided whether or not to move the rack around.
I replaced the tweeters in my sl2s. Don’t recall any alignment issues so I guess I just centered them on their mountings. Probably had to adjust the front baffles afterwards to get them centered as per the standard installation procedure. Few years ago now so hard to recall.
Anyhow the important thing was that afterwards they sounded rather good both in my system and in their subsequent home.