giovanni56

The Sprague are the best conditioners, however in the many deliveries I have done, I found several out of specification, they are not eternal and after 45/50 years once you open the case for maintenance I think it is useful to replace them and not have problems for other decades

Sul disegno Ar è indicato un diametro di 263 mm, ma 248,9 + 31,75 = 280,65 che è la misura che ho trovato.

Thanks, guys, I have to build a pair of them on some bad woofers and I just needed the measures, however I noticed that on the 200003-1 the masonite ring has a width of the circular crown that is the largest diameter smaller in the first 200003 up to those with the black basket, then slightly reduced in the 200003 versions Ar10p with white logo on black up to about Ar9. I have made now a measure of the external diameter of the masonite ring on a woofer 200003 with black basket and it is 280mm so the 263mm indicated in the Ar drawing does not convince me, maybe the drawing refers to the masonite ring of the 200003-1.

Roy, thank you very much

Good evening everyone, where can I find the schematics for the Ar LST2 crossover filter? Can someone post it, thanks.

Altoparlanti da ritoccare e woofer da riassare.

Grazie

That's a hybrid suspension! That brochure doesn't look like a photo, it looks like a rendering, the tweeter doesn't even have the three suspension points on it!

Hi Luigi, thanks for the clarification; so, if you want to be fussy, on Ar 200003 woofers, according to the years of production, you could install specific foam with the curved edge of different sizes. I have found 17.5 mm, 18.7, 19.2 and the infamous 14.7 with wide external flat edge, of which I have never understood the reason for being conceived.

From the attached Ar drawing the curved edge of the foam is 0.72" or 18.299mm.

Thank you, for translating

I noticed that the curved edge width in the Ar 200003 woofer suspension in the Restoring AR3a document is listed as 5/8" which corresponds to 15.875 mm. Dealers of replacement suspensions, for example Simplyspeaker or MidWest, have suspensions with 19 mm (6/8 ") and 17.6 mm (5.6 / 8") curved edge. Can someone explain the reason for these differences? The 5/8" format listed in the Ar3a Restore document, is that the correct one? Thanks to all

Anch'io preferisco il 200003 e il 200003-1, al TNG che, a mio avviso, esprime un basso più leggero e meno "magico", tuttavia le differenze sono lievi e calibrando la quantità di assorbimento del cabinet si attenuano così tanto. Con identici valori di Qtc, sia con il TNG che con il 200003, la qualità dei bassi è simile, inoltre la disposizione in camera degli altoparlanti aiuta ad ottenere bassi molto simili.

Di seguito sono riportate le misure di woofer, midrange e tweeter dell'Ar10Pigreco Replica.

The hand-corrected label (with a 1 in place of a 3), has the initials 1200013-1 which was the one attributed to the Ar3a Replica's hard paper dome tweeter.

I also answered about the same question

The filter diagram I attached fits the 2010 Scanspeak tweeter which is 8 ohms. Everything is described in the thread. You have to eliminate the 6 nF capacitor and exclude the potentiometer that are part of the fitro for the Ar3a 4 ohm tweeter.

Hi Giorgio, yes, I have the measurements of the woofer and tweeter Ar/TNG, as soon as I recover them I'll send them to you on Whattsapp; given the treatment, I think I won't post anything here anymore

This is the last pair of Ar LST's I restored about a month ago. The owner's name is Marco, he lives in Pisa. He brought them to my home in Ravenna as several other owners of Ar speakers have done over the years to entrust me with the restoration or maintenance, so I had the opportunity to test and measure several drivers. I own a pair of 200010-1 midrange speakers that I jealously guard as a spare and do not sell. I joined this group because since 1970, I have been an Ar enthusiast. I joined because I like to compare technically, with due respect and education to all, no one excluded. I'm not a salesman and it's not my habit to tell lies. What I have stated in my previous posts on this thread is due to technical considerations, but I respect your opinion that comes from your decades of experience in the field. This is not a competition between you and me to see who can piss the farthest. Best Regards Giovanni

Very nice, congratulations!

Every time I restore a speaker I measure all the drivers and, over the years, I have measured a lot of them, I have restored three pairs of Ar LSTs that have a total of 24 midrange drivers and many other Ars with the 200010-1, so thirty might be a few. It is true, as we age, the Fs of the drivers decreases but, if Ar claims 400 Hz for its new 200010-1 midrange, I would have expected that the ones I measured, being old, would have values lower than 400 Hz. In my opinion the mid 200044 is not compatible with Ar11 (and similar), with a cut between woofer and midrange at 525Hz because it has a too high Fs that is not mechanically controlled with the external damping wool held on the dome by the external grid as on the midrange 200010-1.

I measured at least thirty Ar 200010-1 midrange drivers and six Ar/TNG 121010-, the lowest Fs was 458Hz in the Ar/TNG, while in the Ar200010-1 550/580Hz, I never found a driver with Fs of 400Hz, while in the 200044 that I measured the Fs values varied from 685Hz to 730Hz, for this reason I consider the 200044 midrange not compatible as a substitute for the 200010-1 without having to modify the crossover filter for eventual use in the Ar11/10, Ar3a/Ar3a Improved.

The attached filter scheme is deliberate, to be used on Ar3a and Ar3a Improved but also on Ar11 and Ar10pigreco