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About brianw

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  1. Rtally Thanks for the explanation, made total sense. As well the link to speaker makers journey! Great explanation. I believe somewhere in my past I recall a Zobel network in the rusty old brain. Again thank you. Brian
  2. Interesting read about xover's and various capacitors. https://www.audiosciencereview.com/forum/index.php?threads/capacitor-upgrade-in-crossover-is-it-audible.12287/
  3. HI David Thanks for the explanation. I realize in general what the circuit does, I was just curious what would happen if the 6 ohm resistor is removed. I suspect it would change the response curve and output level. I am curious so presently playing with xSim to see what it actually does to the curve and the output. Just thought maybe someone else might have a idea already. Thanks in advance Brian
  4. After all the xover rebuilds and other refurbishing both of my AR 9 sets are spectacular. Not being someone who understands xover design, what roll does the UMR 6 ohm 22watt capacitor perform ? Is it to lower the output of the UMR ? Thanks in advance. Brian
  5. I would agree that sticking to same dome type would be good although although the materials and characteristics of the dome will still cause many differences. The shop is is a metal fabricator, the bonus is they have a CNC machine, so I will have to supply and original plate for them to scan, should be interesting, found them through a friend who owns a custom granite kitchen counter top business. I did notice the of axis graphs and my first choice was the SB Accoustics with the XT 25 second. I have never actually seen specs on the original AR 9 tweeter so have kind of been doing some
  6. HI Pete Point well taken, coolaid swallowed. So for my own curiosity I have come down to a few possible tweeters I would like to experiment with on a sound level even though specs make require adjustment to the upper frequency cross over. I have also sourced a fabricator locally who can produce an adapter plate quite reasonably to prevent making any alterations to the actual cabinets. Should be a good experiment for myself to sit a modifed AR 9 next to one of my original AR 9's to do an A/B comparison. Before I do any ordering of tweeters I thought it best to get your professiona
  7. HI RoyC Would better dispersion not be a desirable thing, and would it not provide better clarity and range at different listening angles. Was there a particular reason for the recessed tweeter in the AR 9 ?
  8. Good point, from my younger days I probably cut off 14K or so as well, maybe its actually time for an ear test also. My concern was difficulty getting good components. Brian
  9. Hi Roy Not suggesting redesigning the AR 9, I love my fully working pair, my first set. The second set is getting final touches, this third set is more of a problem so thought I would see if other drivers are out there that were very close in performance to the original AR 9 before trying to do a ferro fluid cleanup and replacement or find someone who can do a repair on the tweeters or UMR But from what you said, I think I will order a couple of the Mid West tweeter and keep an eye for some UMR in good shape. Brian
  10. I know its been talked about on this forum before, and I have red a lot of discussions on tweeters and replacement tweeters. But I decided after acquiring another set of AR 9's that have some failed and aged or weak drivers it was time to resurrect this subject as the spare parts do get harder to find and when you do find originals you often have the problems associated with age and what you actually get when buying such an old component. I recently found my second pair of AR 9's had a very veiled sound, after swapping tweeters from a pair of AR 91 speakers I discovered it was a tweeter probl
  11. Thanks DavidR That info about the AR 9 tweeter repair was very valuable. I was also told they were not repairable. So what would be nice if there was a speaker repair service that could service the tweeter and the UMR. Myself I am not that steady handed and will get new glasses before attempting that tweeter operation. Has anyone actually used the tweeter from Midwest Speakers and if so what were your findings ? https://www.midwestspeakerrepair.com/shop/home-audio/mw-audio-mt-4121-75-inch-dome-tweeter/ Brian
  12. Think we have traced the problem. Swapped the AR 91 tweeter with the AR 9 tweeter and behold, the veil was completely gone what a difference. So did a plain decibel measurement with a test tone at 9k and 10k set the original tweeter for about 65db, left everything the same changed to the Ar 91 tweeter turned power amp back on did a measurement and saw closer 69 db maybe pushing 70 db. So we changed out both tweeters from the AR 91 and put them in the AR 9's .... End result was the more amazing then the amazing I had before. Guess I will change my will and have my ashes buried insid
  13. Hey guys Thanks so much for the input on the sometimes veiled AR 9 sound. We will figure it out, I have two(2) near mint sets of AR 9 so comparison is easy just have to go room to room. As well as the AR91 and AR 7. What I can say is the AR 91's sound clear, open and crisp although they are a 3 way. The second set of of AR 9's were rebuilt using Benics and dayton caps. And seriously I would have to say the AR 9's with the Mudorf aluminum oil sound the better of the two sets. What i do notice about the sets of AR 9's is the tweeters in one set are definitely louder and mor
  14. So my next question is with all the high end electronics ; 2 x Bryston 4B ST Power AMPS 1 X Bryston 3B ST Power Amp 1 x Marantz AV-7005 pre amp 1 x OPO BRP-103 We still find the AR 9's have a lack of openness, or much like a thin blanket over the speakers. This of course varies with source but seems to be present. Anyone have any thoughts on bypass capacitors, possible tweeter issues or do we need to make a tweak to the crossover to eliminate that roll off of the upper frequencies. Maybe someone can explain or offer suggestions that would be great. I have also been tol
  15. HI AR Surround So for the slow reply, caught up in the season and demands on my time. I get no harshness or glare from the UMR at all. And seriously no noise, just clean. I am driving the AR 9's with a Bryston 4B ST Power AMP with lots of headroom, a conservative 350 Watts per channel. www.bryston.com What I found is everything is so clean that depending on the source the 9's sometimes sound like they have a bit of a vale or blanket over them. The tweeters are working but I am wondering how well, possibly the efficiency has dropped. As I have sometime boosted the 6
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