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genek

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Everything posted by genek

  1. genek
    I wonder how the "Harman Curve" compares to the old Harman standard, which, IIRC, was whatever the majority of listeners in Floyd Toole's 1980s blind listening tests said they liked best.
  2. genek
    Different. Check the AR-5 schematic in the Library for values.
  3. genek
    Someone who is an "original aficionado" would most likely want to see some new response curves to determine how the speakers with rebuilt tweeters compare to published curves for the speakers when new. This is the crowd who would care that the level controls don't line up with original settings and would be looking into things like adding resistors or coils to bring response back to original. There are others who will be more flexible. These are the folks who replace original tweeters with HiVis and don't bother with adding coils, or are satisfied with L-pads instead of pots. For them, you'd probably be ok just specifying the ways in which the speakers have been modded from original.
  4. genek
    Hopefully, you are not planning on reselling, because a vintage AR "aficionado" considering buying will be unhappy to discover that the white dots no longer correspond to AR's factory Normal settings.
  5. genek
    Microstatic marketed these as devices to widen high frequency dispersion, as opposed to just adding more highs. Their advertising brochures had photos of them on top of AR-3as, but IMO their biggest impact was when I added them to ARs that didn't have domes, like my AR-6s. I think they'd be utterly redundant on top of speakers like the LSTs and MSTs.
  6. genek
    I have two sets of Microstatics left (I sold the other set to one of our members a few years ago, don't remember who). The units with two small and two large tweeters measure 9.188" across. The units with four identical tweeters measure 9" even across.
  7. genek
    Even NOS would be age degraded by now. Best you can do is measure frequency response and compare to old measurements.
  8. genek
    My thought was a Microstatic-shaped cabinet with four HiVi QiRs. They have a response range from 2.5k-20k, the same as the the Microstatics. If this discussion takes off, I'll move it to Mods, Tweaks and Upgrades.
  9. genek
    So if rebuilding a tweeter produces more output, do we know how it compares to the tweeter when new, and would more output than when new always be good...?
  10. genek
    Ouch. That means that when the speaker is positioned properly, there will be exposed holes. BTW, if that is a 2a with the cross-fired mids, proper positioning is laying it down horizontally. Cross-fired drivers should not be vertical.
  11. genek
    A portion of this discussion has been banished to The Kitchen. Disagree all you want about equipment and components, but not about each other's motives or behavior.
  12. genek
    First thing I would do is try tapping the back where the terminals on an AR would be to see if there's a hollow sound. Someone's veneer job may have been interrupted before a terminal opening got routed out and the terminals may still be there under the veneer.
  13. genek
    Most modern supertweeters are not going to provide the added "highs" that fans of modern speakers are after, because the sound most modern listeners are missing when they say ARs have no "highs" is actually mostly in the upper midrange (2kHz-4kHz) and presence (4kHz-6kHz) regions. Aperion ribbons, for example, don't kick in until 8kHz. By comparison, the Microstatic array can be set to go as low as 2.5kHz. Longtime readers of this forum may recall that our late friend Carl Richard (Carlspeak) designed an "updated" version of the 3-series called the "Super 3a," that replaced the original dome mid and tweeter with SEAS drivers. Maybe what's needed here is a "Super 3t," with the HiVi Q1R and one of HiVi's dome midranges in a small box.
  14. genek
    Yes, but it's a supertweeter that produces vintage AR highs. If someone wants to boost highs to modern levels, another one will be needed.
  15. genek
    Sounds like a job for a supertweeter.
  16. genek
    The models overlapped: AR-2 1957 - 1964 AR-2x 1964-1970 "early" AR-2a 1959 - 1969 AR-2ax 1964-1970 "early" AR-2x 1970-1973 "late" AR-2ax 1970-1976 "late" There are a couple of members who can rebuild tweeters. Will let them say whether their services are available.
  17. genek
    The 2ax was a 1964-1976. Your is an "early" model, between 64 and 70.
  18. genek
    If you watch the video, the covers of the books on the table are not reversed. The image is not flipped.
  19. genek
    It's a video.
  20. genek
    The logo plates appear to be on the wrong side of the grills?
  21. genek
    I think the question is whether the OP wants a full-on restoration or just to get them looking and sounding halfway decent. They have aftermarket drivers that have aged out, so someone was probably listening to them not sounding original for a long time.
  22. genek
    No-name tweeters, too.
  23. genek
    If you try removing the grills, there's a better than even chance you'll break them, so consider that as you're deciding whether you want to clean them. You can probably conceal most of the cabinet blemishes with some lightly tinted paste wax. And if you get them into their most optimal position off those stands and into that shelving you'll only be looking at the front moldings anyway.
  24. genek
    Restor-a-Finish is not a stain. It's designed to soften an existing finish to enable the removal of scale and trapped contaminants. The color is pretty faint. Your best bet to darken the face frame is to mix up some additional tung oil with more dye in it and then wipe or brush it onto the lighter wood. Put some painter's tape along the joint so you don't get any on the rest of the cabinet.
  25. genek
    You can try dipping a pad in some stain and wiping it along the too-light strip. The color will be laying on top and will be more subject to wear than the finish overall.
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