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About Alessandro

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  • Birthday 10/29/1956

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    Rome - Italy

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  1. You could also use a two-component wood glue. However on my AR 7 is not a white adhesive is instead present a rubbery adhesive semitransparent. I always face the presence of such adhesives on all AR 7 but the reason lies in the fact that the size of the hole that houses the woofer and almost indentical to the internal width of the cabinet so you have to make that part more tough. If desired inside you may paste the strips 1cm square and the problem would be doubly solved for both the robustness that for the seal. Alessandro
  2. Hi Analogean, For the restoring take a look at the work I've done on my AR 7 & AR MST at the following links ... I hope you will find something that will be useful . Regards Alessandro
  3. Hello ra.ra, Thank you for the good appreciation. However the condition of the cabinets was really a disaster! I forgot to take accurate photos before. As regards the crossover all ok, in fact, the caps were ok and so the resistors and switches. So I have not seen fit to replace, instead, as you know, I had to carry on my AR-MST. Would also bring all aware that making a new real wood veneer is not very difficult in fact to be found on market for roll veneer and so you can buy the necessary length (see attaching pictures of raw wood and impregnated with adhesive side ). These wooden rolls have the distinction of having an already applied adhesive on the side ... it just lays it on the surface and therefore with a very hot iron, ironing you pass on the noble surface and paste. Finally take off the excess edges with a sharp knife. Need to pay attention only to the 45 ° cuts to the front edge. They pass a pair of nut oil hands and finally of beeswax that must be pulled with a wool cloth. The domes in the center of the woofer cones have been forced to change from flat (original) to those in the dome since a thorough cleaning was necessary flowing in the coil magnet. I confirm that I am very happy and satisfied with the work done but it is now a pleasure to listen and be given a second life to these beautiful AR. Regards Alessandro
  4. Dear All, How do the other had to do half a miracle I mentioned in my previous post I found a couple of really bad AR7 were reduced both from an aesthetic point of view, the paintings were to be replaced, a Tweeter had burned the coil, to be able to reconnect a pole because it was broken near the dome, both woofers were from clinching capacity and the baskets were filled with oxide, fortunately spiders and coils were unharmed. So the furniture I had to scrape down with an orbital sander and then I proceeded to lay a new wood veneer, then two coats of oil and a wax. I placed a tweeter and I've replaced one that had landed from an AR 6 when I had replaced both, then I cleaned up the woofers and did replace the foam. The great work of restoration gave her paid off and now I am very happy because they sound really great and have become part of my collection of small AR: AR 6, AR7 and AR MST that some you will remember that I converted into three tweeter version. So for me it is a pleasure to make you take part in this success .... with patience, a bit of attention and a bit of manual work ... nothing is impossible. Greetings BEFORE:
  5. Hello ra.ra. Thank you for asking. In fact when they arrived the two 10 mF caps I was surprised by the size, which is why I was forced to position them as you can see in the pictures otherwise the woofer could not be positioned correctly. However this kind of caps are really recommend, have a high-speed response. Therefore the choice of including an 0.82 mH inductance I used a computer for passive crossover filters in order to obtain a lower cut at a frequency of 1,600 Hz to 6 db per octave while the frontal Tweeter couple have a cut to a frequency of about 1.900 Hz up to 5,000 and finally the single tweeter side operates by the frequency of 5,000 Hz always at 6db per octave. Although apparently seems to be a gap between the 1600Hz and 1900 did I just get a slight decline as I used cuts only 6dB per octave. As regards the application of Zobel filter did not give me satisfactory results as such filter from considerable advantages in the presence of crosses at the same frequency. In fact also acoustically I obtained a response bending at low frequencies (between 70/80 Hz and 400 Hz). Finally accurate that actually exist on the diagram of my AR-MST and that of AR-MST / 1 on the "decrease" position, in fact I've kept a 3 ohm resistor instead of 6 ohms and not in parallel to the main line . I hope to have a clear statement of how elaborate and in any case I can not help but thank You All for the valuable tips that have allowed me to have now a pair of AR-MST of which are extremely happy as well as my pair of fantastic AR-6 (European version). Now I'm working on the restoration of an AR-7 pair ... but this is a new challenge! Regards Alessandro
  6. Hello Timmy, This is the end xOver schematic. Regardas Alessandro Catalano
  7. Hello Timmy, How do you know my AR MST are the model to 4 tweeters and as written earlier I was not happy with the sound so I tried everything that was written about and this forum I found many answers and many aid. So I started to make some gradual changes and now that I have come to an end are really satisfied. Now they're playing very well with powerful bass and mids and clear highs. The first step was to replace the capacitor 6 mF with a 10 mF high quality (and expensive), and I had already obtained a marked improvement in performance, and are then passed to the three tweeters version by following the chart instructions ( with the exception of "Decrease" position in which the resistance had to be done in parallel ... I simply adopted as also adopted in the RA 6). In addition to ease banking problems between woofer and tweeter I also added an inductance of 0.82 mH. Finally I removed a Twewter for each speaker (one right and one left and I closed the hole with stopper plywood carefully cut for the purpose. I now have a pair of AR MST fantastic. I hope to be liked and the rest at your disposal for any clarification. However, the brown glue melts with the heat of a soldering iron. Now I bought a pair of AR 7 I'm trying to restore ... but it will be difficult because the furniture is shabby. Thank you !
  8. Dear All, Today I found on a sales listing of a couple of new woofer for AR 6 and attaching photos . I ask for help because the codes are not 200,001 but those visible in the images , and also the shape of the magnet is round instead of square . Would you be able to confirm that these are the latest evolution of the woofer for AR 6 ? Thanks in advance. Regards Alessandro Catalano
  9. Hi Stimpy, It ' a pleasure for me to give to you some information that may be useful for your fantastic AR Speakers ! Alessandro
  10. Hello Stimpy, Actually I am very pleased to have entered a filter for the woofer and in fact now AR MST sound very good . I confirm that the woofer and the tweeter are all of the same polarity and everything seems to work well. Next weekend will put zobel circuit on the woofer as on AR 6 and see if there will be further improvements. The caps are very good and I highly recommend them. They have a very good and clear sound on medium and high frequencies . Alessandro
  11. Hi, Hello, I point to the new implementations made my AR MST: in my previous post I replaced the capacitors with 2 new 10 mF high quality and now I have also added two inductances from 0.68 mH around so as to get a crossover frequency to about 2,000 Hz (Look for reference the attached crossover scheme) . Now at last the AR MST have a much better sound and so all musical instruments are at the right distance. I am waiting for the arrival me more capacitors and resistors (24 mF caps and two resistors 10 Ohm) so as to place them directly on the woofer terminals such modified Zobel circuit. This should improve, I think, to correct the issue as a result of the correction of the inductive area in the woofer crossover with tweeter. Unfortunately, at this point, not having available an anechoic chamber and suitable instruments, go forward by trial. Therefore any of your suggestions will be valuable to me. Thanks for your attention. regards Xover AR_MST.pdf
  12. Hi, I think I can confirm that it is correct as stated by "ra.ra." Alessandro
  13. Hi Timmy, It is not necessary is almost irrelevant given the tolerances of the caps. I am also considering to increase the performance of the crossover by the addition of an inductance from 0.82 mH and a zobel circuit mounted directly on woofer exactly as on the AR 6 crossover ... but I will let you know how it will sound, while maintaining the four tweeter configuration Alessandro
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