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Jeff_C

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About Jeff_C

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    Birmingham UK
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    Music, HiFi, Cycling, Holidays

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  1. Jeff_C

    AR-16 Resurrection

    This is a really old thread and the links to those PDF files no longer work. Any chance that the original files can be re-uploaded for eager AR-16 owners like me and any other interested parties to see them?
  2. Jeff_C

    “ AR-LST, after Forty Six Years of Use”

    You (and others) are right, I was commenting about a usual series/parallel arrangement. I should have looked at the schematic.
  3. Jeff_C

    “ AR-LST, after Forty Six Years of Use”

    To elucidate the point RoyC and Aadams makes, if one tweeter in the 'series' wired section of the LST is blown (goes open circuit) then its partner tweeter wired in series with it will also cease to produce audio, as it has no complete circuit. The parallel wired pair of tweeters should still work. Taking this a step further, if two tweeters go open circuit, then depending on which two , there could none of the four tweeters producing audio or two tweeters producing audio. I believe it would take a minimum of 8 tweeters to go open circuit to prevent all 16 tweeters producing audio. But conversely the 'right' combination of 8 blown tweeters could leave 8 producing audio.
  4. Any idea of the timeline when this rental plan was offered? Dealers here in the UK have been offering home trials for a few decades but usually the dealer offers up their own demo pair and I have always declined home trials because I would feel a bit guilty if the trial (or trials) failed to win the dealer a sale from me. Home trials of equipment funded by the manufacturer with pick up from local dealer seems a more workable arrangement IMO.
  5. Jeff_C

    AR5 restoration - advice needed

    For those living in Europe, this supplier comes recommended. I have used them in the past. Your foams are shown in this link with proper white water based speaker glue lower down the page. I took advantage of buying 3 at the discounted price in case I messed up, but even as a complete novice at this I only needed 2. http://speakerrepairshop.nl/index.php?item=foam-ring-_10-inch_-for-acoustic-research-ar5-woofer&action=article&group_id=10000033&aid=945&lang=en#.Wd3lHLpFycw
  6. Jeff_C

    Unbelievable find, NOS

    Doesn't anyone else feel it is rather strange that no explanation has been offered as to why these have remained unopened for so long? There must be a story to be told.
  7. Jeff_C

    Should the AR-5 have been a 12" Speaker?

    Dr Floyd Toole has said (fairly recently) that how the bass sounds accounts for about 30% of a loudspeaker's appeal. Back in the days of the Advent vs AR-5 I believe how the bass came across was probably even more important to a prospective buyer. So no surprises that the Advent at its price point did very well. I suppose there is a point where the mid and treble have to be 'good enough' to get the sale and the Advent easily met that criteria.
  8. Jeff_C

    Market for LST

    But you still have to play digital sources through loudspeakers. I do not uphold the view that any piece of vintage gear should only be used in a hifi chain of exclusively vintage gear. That would be so limiting.
  9. Jeff_C

    recapping epi 104c

    Welcome to the forum. I am unfamiliar with your speakers but the caps are usually glued down to the crossover board or cabinet on most speakers of this vintage. If you are going to replace the caps then cut the wires as near to the body of the old cap as you can. That gives better options for using that wire for attaching the replacement cap. Once the old cap is cut free you can work on getting it free from its glued mounting to the cabinet. If you do not know the value of the caps that need replacing make sure you do not obliterate the markings on them trying to get them away from the cabinet. Some caps age better than others so there is a possibility that the caps do not need replacing. It is always a good idea to post some pictures along the way, especially if you have any difficulties. I'm sure others will help out here who are more familiar with your speakers.
  10. To my mind that is the neater solution, especially if the switch was never going to be used to direct the signal to different rooms. What swung your decision that way finally?
  11. That fits perfectly with my thoughts on the affect on impedance of adding subs. I hope that proves to be the case.
  12. Jeff_C

    new acquired AR-18's

    I made cloth covered wooden frames for mine. I only use them as covers and leave them off for listening. The original foam grille was extremely acoustically transparent, but the cloth (even to my aging ears) cuts out a noticeable amount of HF response. YMMV. The foam was machined out to be quite thin where the drivers are placed, that may have helped with transparency. I doubt that any foam grille replacement would have the sculpted out foam where the drivers are placed, but if they can do that as well for reasonable cost then great. That is particularly what was on my mind when I said they may be "difficult/impossible to replace". If I could replace the foam grilles for reasonable cost I would like that because it puts the speaker properly in its time zone of mid to late 1970s when many speaker manufacturers used foam grilles.
  13. Jeff_C

    new acquired AR-18's

    They appear to be the original open cell reticulated foam grilles and they do look great. If you can delicately rub your thumb along a bottom edge of the foam grille and do not get any crumbling away of loose cells, they should be good for a few more years at least. Keeping them away from UV light may help to preserve them more. I wonder why the woofer foam surrounds have rotted when the grilles have survived. As these are now vintage I think I would put a full cover over the speakers when not in use after they have been restored. That may help preserve those grilles as much as possible. They will be very difficult/impossible to replace. I had similar foam grilles on the AR-16 (they are from a similar era, mid to late 1970s). The grilles were exposed to quite strong sunlight in the environment where they were used (well at least when the sun shone here in the UK). I remember the grilles lasted about 10 years before I gave up on them and threw them out. In the latter years of their use I used to see black foam crumb on the floor beneath the speakers. It became a weekly job to hoover it up. When doing the 'thumb-crumb' test dislodged too many foam cells from the grille I threw them away. Operating the speakers without the grilles on the woofer foam surrounds were then getting a good deal of sunlight exposure but they lasted a further 7 years before the speakers had to be 'retired' in 1993 due to woofer foam rot. During the 10 years lifetime of the grilles I used to wash them occasionally in a bowl of warm water and washing up liquid, just gently squeezing them with the palms of my hands so that the detergent could work to dislodge household dust etc. Then rinse them in clean tepid water and then lay them out to dry on newspaper before attaching them back on the speakers. I do not believe that process shortened their life.
  14. Adams - I have found out that the CR65 have nominal impedance of 8 Ohms. I would try and find out what the minimum impedance is and at what frequency(ies) the lowest impedance occurs. The fact that the CR65s are 8Ohm makes things a little easier because wiring in parallel gives a nominal impedance of 2.66 Ohms. If you set this up without a switchbox it should fall within the amp's operating spec, and you will have the advantage that the full power availability into that 2.66 Ohm load will be being used to create sound, (rather than being wasted as pure heat dissipating across a protection circuit resistor). In turn that will mean that you will not need to crank the volume up so much to get to the desired listening levels. If it were me I would try the setup without a switchbox especially if the switchbox would only serve as 'protection'. It is worth investigating whether the amp features any protection circuitry. Many just shut down if safe operating limits are exceeded. As for the wiring harness you could code all the up the cables with matching codes on the speaker terminals so the end user cannot go wrong. The only thing I am unsure about is how the subwoofers affect things as I have never used subs or even contemplated using subs. But as the subs are self-powered with their own amplifiers I doubt that they affect impedance calculations but I would certainly want to be sure about that first.
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