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About DavidDru

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  • Birthday 04/25/1966

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    Boise, Idaho
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  1. L710 conundrum????

    Hmm, Rob, those do look odd, including the mids and tweets. Here is my 710:
  2. Newly acquired AR-78LS

    The car analogy is a good one. One would wonder what would have happened if AR had kept the model number going and just made changes to it over the years like they seemed to do for a while with various models (3 -3A, 2-2a-2ax etc). At some point they either felt the design changed enough to call it something else, or the marketing people finally got their way. No doubt, the 3 and 3a were the industry standard for write some time and I am sure other speakers manufacturers probably tired of being compared any time they came out with a 3-way design of similar proportions.
  3. The Quintessential AR Speaker

    Great responses above. And I will throw in my response....in era's. The AR3 established AR and defined so much for the brand and in the industry, as well as customer expectations from that point forward. The 2nd era would have to be the AR9. Both made huge statements.
  4. Newly acquired AR-78LS

    My comment was just that, a thought out loud comment and general question. Not pointed specifically at your feedback on these specific speakers ra ra. It's just interesting to me that so many other later models from AR are looked upon this way, where in general most are just 3-way designs like many other brands. I would guess it would depend on how different the drivers were at this point. The enclosure is different. Crossovers are different etc Maybe I am wondering if it's a fair thing to do and wondering if it's only because it's the same brand. Thought I would throw out the question and get people thinking and responding.
  5. Newly acquired AR-78LS

    I bet those are good. So are we always going to say any 3 way with a 12" woofer from AR is a descendant of the AR3? At this point in the chain I am not sure what the 3 or 3a would have to do with a 3-way 12" design.
  6. M-907 to be restored

    Sorry for not responding earlier Pete. The amp is a Phase Linear 400 that has been rebuilt entirely to the White Oak up grade. WOPL as most refer to it as. Phenomenal. Powerful. Now found some DQ-M5's A smaller 2 way. Also very good after new surrounds.
  7. Biamping L1590 anyone doing it?

    yes. Device sits between preamp and amps. This particular one is 2 in 4 out so I can split to two amps. Connect the device to your laptop and a microphone and make any adjustment you can think of and what the computer picks up on. They have others that split more ways too. Can be used to do high level room equalization adjustments or used to divide. Or both. Once you set the settings you disconnect the computer. Look up minidsp
  8. Biamping L1590 anyone doing it?

    I am still planning on it. I picked up a MiniDSP and Umik microphone so I guess I can give it a go.I will be mixing and matching amplifiers though. Wondering if it will be okay to use my WOPL SS 250w/ch amp on teh bottome end along with my Dynaco ST70 up top for something like this.
  9. Allison CD8 Speakers

    Marc, where are you located?
  10. 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.
  11. 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.
  12. 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.
  13. 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.