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About michiganpat

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    Advanced Member
  • Birthday 02/06/1975

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    west michigan
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    my family, mopars, music, vintage marantz gear, restoring vintage speakers, building speakers
  1. Holographic Imaging Series M4

    the woofers down in the cab are pretty easy to refoam. The holographic series (at least the M5 & 6) used film type caps that shouldn't need to be replaced in the mid/tweet circuits. I've seen a few holographic series where the dust cap is missing...they're a very flexible rubber....not sure where to find a similar one. most I've seen are cloth, paper, or hard plastic. these were the only ones I could find http://www.speakerrepairshop.nl/index.php?action=page&group_id=10000097&lang=en#.WlAbBXlG1WI
  2. Holographic Imaging Series M4

    IIRC the bottom internal drivers on the M4's, like my old M5's, have paper cones and foam surrounds. you'll probably need to refoam them.
  3. Teledyne Era AR's

    teledyne bought AR in 1967 and sold in 1989.....so a large number of "classic era" AR's were teledyne era (Ar3a, AR5, 6, 7, the redesign of the 2x) though the ADD series, the vertical series, the LS series, to the TSW series.... Allison left I think in '71 and didn't have further involvement with AR after that
  4. Why was the AR-12 a one-year product?

    I'm guessing the spiderless, 12 only mid was also an expensive option to cover the gap from the woofer to the 3/4" tweet a relatively flat response 4-5" cone that reaches down the 300 hz seems like it should have been easy to source even back in the 70's....
  5. AR18J Restoration - information and help

    it's an open cell foam . I've made some out of felt on mine, and have also cut out foam rings....
  6. Help needed with newer AR 1 Tower Speakers

    huh, I still have my AR 312HO's, the hi-res older, 12" non-powered cousins....the foams on the woofers are still good, and the mids are still fine... I don't think the foam surround around the mids & tweets are glued in, I think it's just a friction fit
  7. I'd think the easiest way would be to run a single tweet and UMR in a vertical array, and one 8" lower midrange to one side with the same crossover as you 90's, but w/o the woofer section and the high pass to the LMR deleted (so that runs "full range" on the low end if it doesn't already).....if you wanted 8"W (MID/Tweet) 8"W arrangement with the woofers (LMR) wired in parallel, theoretically whatever components are on the LMR low pass crossover, you should be able to halve the inductance and double the capacitance and get pretty darn close. if you wire the woofers in series, you'd do the opposite (double inductance and halve capacitance).... I'd size the enclosure something between an AR17 and 18 for 1 woofer, about double for 2.....
  8. Wife needs help finishing his bucket list AR92s

    I'd love both, but too far from me, and my wife would probably either divorce me or kill me for the insurance money (:
  9. Where to find 10" Bass Drivers for AR9LS

    wonder how this would work.... http://www.humanspeakers.com/diy/parts/031.htm or is the basket 1/8" too large?
  10. Where to find 10" Bass Drivers for AR9LS

    yeah, I know they're different...the 2nd one from MISCO's website is what Meniscus used to sell as the 10" "eclipse" woofer.... guess I didn't pay close enough attention to the physical dimensions of the first one.... I have some Eminence 10" subwoofers that probably would be a good fit, as they model very nicely in a 2ax or AR3 sized cabinet.....shipping to Australia probably would not be cheap...
  11. Where to find 10" Bass Drivers for AR9LS

    https://www.midwestspeakerrepair.com/mw-audio-mw-5010-10-inch-woofer based on what you know of AR 10 inchers, how does this driver compare, Roy? I'm guessing Midwest has this made by MISCO. IIRC the old Eclipse 10" Meniscus audio used to sell (also made by MISCO in minneapolis) models very well in a 2ax sized box.... Here's a link to the specs on MISCO's website http://www.miscospeakers.com/speakers/OC10W-8D
  12. Where to find 10" Bass Drivers for AR9LS

    their DC resistance is 4 ohm? typically when I've measured advertised "8 ohm impedance" drivers, DC resistance is in the 5-7ohm range.....haven't measured many 4 ohm drivers, but IIRC aren't "4 ohm impedance" AR 12" woofers typically ~2.5 ohm in DC resistance? wow, that's a different duck with the 10 and 12 sharing the same chamber.....and such a large chamber. maybe 4th order bandpass isn't appropriate, as typically the 2 chambers are similar in size.... if I had to swag, you'd be looking for something with low FS, moderate to high Qts, and moderate VAS....maybe something like these: https://www.madisoundspeakerstore.com/approx-10-woofers/scanspeak-discovery-26w/8534g-10-aluminum-cone-woofer-8-ohm/ IIRC if you get a DVC woofer, you can theoretically shape the Q by hooking up one voice coil, and then either leaving the other open, shorted, or with a resistor between the non-driven voice coil's leads....
  13. Where to find 10" Bass Drivers for AR9LS

    since it's essentially used as a subwoofer, you may be able to look at the chamber volume, and try find a 10" driver with T-S parameters and the same impedance as the original to work until you can find original drivers or get yours fixed. with the downward firing and slotted output chamber, I think the calculations for a 4th order bandpass box would be the most applicable. I don't know if the 10" down firing woofer is the same as the main driver on a 92LS, in which case you could probably substitute any 10" woofer from a newer 2ax all the way up to the TSW series in a pinch....
  14. AR-18s speakers

    for my 58S's, I just recovered the MDF grille frames in linen, look great. in hindsight, I wish I would have run them on the router table at work with a 1/2 chamfer bit and put a bevel on it like the original ADD grilles. on the 58S's, the posts are on the box, and the grille frame is 3/4" MDF with holes to receive the studs....I have a spare badge, if it's the same as the 58S, but not a filler panel.... I've thought long and hard about pulling the vinyl off my ADD 18's and using real wood veneer....just never got around to it. shouldn't take more than $30 worth of veneer for the pair....
  15. AR93's - A New Project

    nice.....years ago I tried to buy a pair but the seller was kind of a putz, and it fell through...if I had to guess, the white dustcap might be heavier to add mass and lower the driver's Fs, much like the "spitwad" dustcap on the smaller advent woofer.... and BTW the AR94 is technically a 2.5 way, IIRC, with one woofer running full range, and the other low-passed at like 200 hz....