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DavidDru

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About DavidDru

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    Advanced Member
  • Birthday 04/25/1966

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  • Gender
    Male
  • Location
    Boise, Idaho
  • Interests
    Kayaking and Golf

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  1. Allison CD8 Speakers

    Marc, where are you located?
  2. Intro

    Welcome to the treehouse Curt. I myself have Allison ones that I rotate in my home office, which is the system I most listen too since I am in there a good portion of the day. They ar very nice indeed but would probably still benefit from some refurbishment. I also have a pair of Al120 in storage.
  3. Venturing into new Territory

    Well, they are in the garage. I doubt they will find a home in my home. Just want to get them to their potential, see what they can do, then see if I can find someone that wants them. I guess I could put them in my office for a while, but they basically would just be lined up on the wall. A wall of sound! Fairly efficient, but that's a lot of drivers and a decent amount of power is best. I just got the replacement caps and such from Parts Express this afternoon so I hope to dive into these this weekend. Will check those old caps. Also got the replacement batting. Had to order a huge roll of 2" thick cotton and also got some wool to try for the curtain.
  4. Venturing into new Territory

    Well, couldn't resist picking these behemoths up when they came up for a very reasonable price. First pair of speakers that the wife got on me for! And can you blame her? They are the 310AP version of the Concert Grand meaning the baffle panel was sold w/o a cabinet that the owner then installed into a wall or other custom build. The date code has these from 1960 so fairly early. They apparently came out of a church a few years ago and it looks like the custom built cabinet was done fairly close to the Bozak plans for them. There are a few key issues I am going to remedy right away and the material have been ordered including the correct batting (and curtain) and new caps around to rebuild the original N-104 crossover to the newer Tobin version with the addition of an L-pad to help attenuate the tweeter. The batting is recommended to be cotton only so I had to find a big roll of the 2" stuff. apparently the curtain, which is material that hangs top to bottom internally directly behind the drivers, can also be wool so I dug up some wool to try first in that position. Bozak seemed to go through various materials through the earliest years including some Kimsul paper insulation that I found inside these, and finally settled on Cotton materials. As with so many other 50 plus year old speakers the high frequency limitations will be present. This include the earliest X version of the tweeter array which is very limited. Original specs have it extending up to 16,000 but most say it may get up to 10,000 at this point. A later release from Bozak was a little better and can be sourced to replace these, but I am in no hurry there. Some are working on a design to incorporate a modern tweeter option. Some add super tweeters too. This also has the earliest version of the wonderful B-209 midrange drivers which unfortunately have a damping ring around the edge of the frame that have all deteriorated and now vibrate and make noise when the volume increases. I have been sourcing the the version that cam out a couple years later w/o that damn ring to replace these with. Some folks simply remove the ring and go with that but I figured if I can source the next generation drivers for a decent price, I might as well. Woofers, all 8 of then are good to go. Here are some photos for now.
  5. Jam, go into you cameras setting and change whatever that particular camera identifies for resolution and image size. Anything for web or screen use can be 72dpi which is probably one of the smaller settings and of course the image size only needs to be something like 400x600, maybe a little larger to be safe.
  6. AR Restoration Meeting--1

    Have a Northeast Region meeting at the old AR headquarters!
  7. AR93's - A New Project

    Got the new woofer driver yesterday, refoamed it last night and have them up and running now. Sound pretty darn good. Again makes me question a recap, but I guess I should just to reset the timeline. Now that everything works I will remove all the drivers, clean-up the paint job, do a nice job with the exposed capstone tops with maybe a piano black finish and keep looking for a replacement material for the socks.
  8. AR9 cost

    What was the big picture with the 9's when they hit the market? Were they cutting edge best of class etc? If so, go to today's similar best and see what they cost and there you go.
  9. Ar3 for $2,600?

    I have the Slant 6. Purchased for the remarkable price of $100 knowing the ribbons were in need of replacement. So for about $550 Graz tells me I have $5,000 speakers. I set of the Slant 8's sold here recently for I believe around $1,200.
  10. Model Seventeens

    The 17 may be my favorite speaker in that form factor. Paired with a nice vintage amp, they are hard to beat.
  11. Ar3 for $2,600?

    Frank, I actually have a pair of Apogee. Many of the key parts are still available with most being upgrades through a company called Apogee Acoustics. They are down under in Australia and the owner is Graeme Keet (Graz is what most know him by). I purchased replacement ribbons for mine about 2 years ago. Well worth the investment. Apogee Acoustics
  12. Ar3 for $2,600?

    Was there anything particularly different about this pair that makes them more collectible than others?
  13. Ar3 for $2,600?

    Why?
  14. Ar3 for $2,600?

    What am I not seeing here beyond that crazy high price they sold for? http://www.ebay.com/itm/VINTAGE-Acoustic-Research-AR-3-SPEAKERS/282611068645?ssPageName=STRK%3AMEBIDX%3AIT&_trksid=p2055119.m1438.l2649
  15. AR 9 Mid and HF Cap suggestions

    I think I have seen it spelled out before, but can someone tell me exactly what bypass caps actually do? In english, not engineer.
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