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cARver

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  1. Pete, I wanted to provide my listening experiences with two pair of AR11's I owned specifically with the tweeter. These were both recapped with original value dayton npe from parts express. Both pair of 11's had higher output than my 3a's but lacked the smoothness of voice with an exaggerated ch~sh tones to true s sounds. I was able to pick up a pair of AR9 tweeters and installed them in one pair with an immediate natural clarity as compared to the original 11 tweeters. This was the improvement needed to make these speakers enjoyable.
  2. Update. I picked up a set of surrounds (260-972 part number) from Parts Express today and confirmed it passes the vacuum test performed in my prior posted videos. The dust cap however is not sealed.
  3. Thanks for your information. From my experience every 8" woofer from a 90/9/9ls/18 all have a dual dust cap. A cosmetic outer cap with a solid inner type. The sealing is provided by the inner cap. The 8" woofer is the 9ls is unique as it has a hole in the center rear of the magnet. When I blow air into this hole, the woofer moves outward away from the airflow, so the woofer is sealed from the magnet. Conversely this woofer is not sealed in my cabinet and is most like caused by the porous surrounds being sold in the marketplace. I have recently performed several tests illustrating this. The foam does not develop vacuum in the first test. This woofer has no acoustic suspension. The foam does develop vacuum in the second test. This woofer does have acoustic suspension. Still investigating and trying samples from other sellers. Stay tuned.....
  4. I’m not sure if these videos will work, but I sealed the dust cap this afternoon using vulcanizing cement. The first video demonstrates the leak past the cap with the paper lifting and the woofer fast movement. 449C07D5-5D75-454F-A53D-692C93221417.MOV The second video has no paper movement and slower woofer movement. F23D6302-F77B-4E3B-A118-662DF3DCD79C.MOV
  5. I see so the inductor is responsible for the additional 6db slope. I haven’t swapped in the 58s tweeters yet because of the wire terminals interference. Once I do I’ll post my results. I posted a question on the slope of the AR9ls per driver like recorded on the 9 owners manual. Maybe you could respond to that post?
  6. Thanks, that was the goal! Much more musical for my tastes.To me the AR11 has a bit of a congestion presentation from 8-10 feet away where as the 3a/58 are very pleasing. Two different crossover designs/frequencies but sound great! The AR11 tweeter 12db circuit, can you explain? Some further explanation of crossover layout/design in these threads would be beneficial to others on this forum. I really find in fascination and educational. The AR11 tweeter to me is sub par in comparison to the 3a tweeter regardless of output. I always noted the tweeter had excess low tweeter high midrange sound character. "s" sounds were "ch" like. The 3a was smooth but potentially fragile and low output compared to the other drivers in the cabinet. The 58s/9/90/91 tweeter is way better in my opinion.
  7. According to my speakers and Feldele's diagram the tweeter polarity is reversed.
  8. So I will attempt to describe what I did to my 11 speakers to address a over open sound as compared to all my other 3 way ARs. These speakers were pushed in the corner for months disappointing with the overall sound. This 11 has a reduction circuit that was very different from the 91/90/9 speakers. I was perplexed until fedeleluigi provided an accurate diagram, thanks Fedele! I studied an understood some of how it reduced the output but never liked the thinness of the overall sound. I don't profess to be an expert and always learning, but for example in -6 db position is the 10 parallel resistor reducing the 15 ohm parallel resistor to an overall 12.5 ohm? Does this alter the tone? I don't know but the driver was still unbalanced (loud) and unmusical to my ear. (My opinion) After tinkering for some time with the 3a setup and noticing a strong similarity to the 11 min range circuit I decided to dive in. With all mid resistors removed, I installed a 15 ohm parallel resistor assembly (duplicated with an assorted series of resistors ) (X,Y,Z) sum equaling 15 ohms like original. The midrange positive wire installed in between the 1.5 and 2.5 for a total of 3.5 similar to AR3a b-1 pot spec. See diagram. After some experimenting I have been very satisfied with the speaker balance now. It still doesn't exactly sound like a 3a but it's closer and ultimately enjoyable. I plan on using some sort of potentiometer in the near future to replace this resistor assembly and offer fine adjustment. Having said that................ All the chatter about the “improved 3a” models 11/91/58s has me offering my opinion of my collection of 3 way ARs. The 3a tweeter was dim needing treble gain to satisfy my taste, mids smooth/clear and woofer strong and deep. 58 tweeter installed now and it's a well balanced speaker. The 11 has a stronger tweeter but poor sound quality compared to 9/90/91 style tweeter, the mid is over bearing and thin and woofer is potent but not as deep as the 3a with more punch. Better now with modded midrange crossover. The 58s has the best tweeter of the bunch, mid needed attenuation (cheaper bookshelf- no switches compared to 91) and woofer needed slight poly fill removed to better perform. 91 is similar to the 58 however I believe the cabinet has some mild resonance during thick mid bass passages. Please feel free to comment or ask any questions as this was a multi-day project while tending to a broken heater and being a father LOL.
  9. I have been learning about crossovers and slopes but no expert by any means. Can some one confirm the slope of the 9ls 9lsi slopes since the owners manuals don't seem to call it out like the AR9 manual does? I'm guessing here on the 9ls/lsi......... 18db 200 hz woofer? 12db 200 hz lower mid bass? 12db 1100hz mid bass? 12db 5500hz mid dome? 12db 5500hz tweeter or 6dblsi mod? Actual_AR9_crossover_circuit.pdf
  10. Anyone know why this link is no longer available? AR-3a-vs-AR-11_Tweeter_ARHPG_001.pdf
  11. Yes, I did both to reduce the images. These circuits are so much different to the 91 in my opinion. The 91 uses series resistance for all the attenuation where as this has parallel resistance for some attenuation? Thanks again!
  12. Here is what I follow as the tweeter circuit. I moved the inductor to the tweeter on the diagram to clean things up. Looks like the tweeter is out of phase from the mid and woofer circuits. I am a novice at this and tip my hat off to those of you who create these diagrams.
  13. Thanks Pete. I've been looking for a while and haven't found them yet. If you see the threads please share. Thanks again!
  14. I am working on my AR11 speakers and would like some clarification, explanation of the diagram listed on the The Classic Speaker Pages. I am by no means an expert and have pondered over this for some time. http://www.classicspeakerpages.net/library/acoustic_research/add_series_1975-1978/add_series_schematicsservic/ar-11_schematic.html There are several difference between my speaker and the link above. I have also confirm my brother's speakers and a spare set of crossovers removed to have the same set up as mine. The first difference are the resistors inside. 15, 10, 5, 3 and 1.5 ohm with this diagram showing 15, 3,3,1.5 and 1.5. The second is an inductor (.44MH ?) on the same side as the 40uf cap in my speaker with the diagram showing on the opposite. The woofer circuit is a match to the diagram. One goal is to understand the paths for the mid and tweeter driver attenuation. I may be missing something, so please feel free to provide some clarity.
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