Tunedguy57

@ra.ra About 4xa I wrote "someway unlucky". And IMO it was, I agree with you about strategies of AR for this model. Personally I prefer the sound of 4x: more smooth and natural human voices. I don't want criticize the Allison's tweeter, actually a beautiful one. About the 6 different performances: even if I do understand that nowadays can be nice comparing and listening different versions, I judge somewhat uncorrect from a serious speaker-maker selling different products with the same name.

IHMO the presence of a glue ring is a normal consequence of assembling procedures, partially automatized. Thickness of the paper of cone from coil to edge normally decrease, and there is no practical need of an heavier edge. Instead, it's desiderable a lighter one, to prevent dynamic shock of the cone surface, and breaking-up phenomena.

I agree, absolutely, usually various version of speaker have had a new suffix ( 2a, 2ax, 2x, 4x, 4ax) but 6 in its various issues never had anything to say: "I' m a new version!" . So one can have in his hands a minimalist 6 ( european, only one capacitor for tweeter) or a much more complex 6 with a completely different xover. It could be ok, if they should sound similar, but unfortunately they don't.

I remember a post from RoyC where he wondered if AR was ever satisfied of 6 model. I think he was right. Since there are not less than four version of 6. Woofer and xover change during six-seven years of production. So things are some confused on their performance. In my opinion it should need specify first which version we are speaking about. My first 6 (european made in Holland) had only a 6 uF capacitor for tweeter and a switchable resistor. No coil, no pot, nothing. Other pair I got later had a coil for woofer and a 10ohm resistor across it. First series had an alnico magnet woofer. Later it was ceramic. I loved 6, but it has been a difficult love. It was anyway my first love. Now I have 4x, 3a, 5, 6, 7 and I do love all of them.

If original and well working I'd keep 6' as first choice. But it should be interesting to know what woofers are mounted on your 4ax. Original ones had cloth surrounds and are not interchangeable with 6' ones, being their Fs about 37Hz, instead 24Hz of those on 6 model. IHMO 4ax was an unlucky version, some way worse than previous 4x. Regards. Tunedguy57

Hi, those "Industrial cond.corp" capacitors were mounted by factory....were really fine and well sounding (paper in oil) but after 40 (or more) years can have gone out of tolerance. In particular it's not so rare their value has become more than 50%. It's a dangerous situation for tweeter! In order to fix your 4x's I should change both with a parallel of a 15uF and a 4.7uF plastic film. I should avoid a 22uF. Better not to stress your valuable tweeters. Best results could be obtained with paper in oil, but they are somewhat expensive nowadays. PS: it s not so rare finding in old AR boxes different capacitors. In particular can be found Industrial paper in oil and NP electrolytics (often by Sprague). They mounted indifferently both so your pair may have both inside. tunedguy57