338(h)(10)
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Posts posted by 338(h)(10)
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Does anyone has a schematic for AR15's crossover?
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18 hours ago, lARrybody said:
I understand where you are coming from 338 (h) (10). The AR25 uses the same size cabinet with the same woofer with a single 6uf tweeter cap. Woofer just rolls off naturally to the 1 1/4 in. cone tweeter. Good sounding speaker. The AR 15 is a different animal allogether. This is my recapped AR 15 crossover.
Quite a bit different. Might work but not sure how it would output with the 15's 1 in dome tweeter.
My 15's
In AR15, the values of the caps are 20uf and 16uf, right? Just wanted to confirm. Also, is there a schematic for the crossover? I am wondering if any of the caps are in series with the driver(s). If they are just in parallel, I may spend less and just buy electrolytic replacements.
Have you compared AR25 with AR15?
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If you guys don't mind, let me throw in two I found online that are supposedly good, new replacement for AR15. Any thoughts?
https://www.simplyspeakers.com/advent-acoustic-research-replacement-woofer-1210132.html
https://reconingspeakers.com/product/ar-9-9lsi-90-8-midrange-speaker/?show-all-questions=15113
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37 minutes ago, AR55 said:
First of all, I would not recommend modifying the AR-15 crossover. I have both the AR-15 and AR-28b, which are both 2-way speakers with 8" woofers. The 28b has a very simple, one capacitor, crossover, while the AR-15's is quite complex. I have compared the two side-by-side and the 28b's sound does not come close to the sound of the 15's. I know part of the difference is the dome tweeter in the 15's, but I believe the crossover has an even greater impact.
As far as woofer options, the 200037 is a good alternate to the 200001. The 200050 is also an option.
You asked for a spec on the AR-15's woofer. Attached are specs that I pulled from the archive drawings. One is a little hard to read, but it should help.
Thanks. This is super helpful.
It appears that this may be a good fit, given the Fs, sensitivity, and FR. But its outer diameter is a bit too large.
https://www.parts-express.com/dayton-audio-rs225-8-8-reference-woofer--295-356
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10 minutes ago, lARrybody said:
If you can’t find 200001 woofers the 200037 woofers would be my next choice. They can be found on the auction site and may need to be re-foamed. My opinion, keep your AR speakers AR.
That would be ideal, but my only concern is that I would not know if the woofers had been abused -- i can take care of re-foaming, but things like rubbing/burned voice coil and weakened cone are beyond my ability. I don't plan to re-sell my AR15, but just wanted to extract the most out of the cabinets and original tweeters.
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OR, could someone point me to any measurement of 200001 (or similar AR woofers, like 200037)? Thanks!
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And how about these? Said to be "AR" woofers good for AR17 (so AR15 should be in the same ballpark).
https://www.simplyspeakers.com/advent-acoustic-research-replacement-woofer-1210132.html
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10 hours ago, nefertem said:
After refreshing myself with your speakers . I remember wanting those when I was just starting out in AR Land. If you were to go with the scanspeak you would be very happy the parts express has good drivers too but they are almost as much as the scanspeak treated woofers I found over the listening experience with my system that the more modern woofers are faster in response and the sound stage is more detailed especially with female vocals and more forward I previously replaced the tweeters too
I noticed that the Scanspeak woofer is 4 ohm, whereas the original should be 8. Is that right? Did you change the crossover to accommodate the Scanspeak? Thanks again.
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4 minutes ago, nefertem said:
The best 8 in woofers out there are made by scanspeak I put these in my AR 93 midrange replacement
Ah, the venerable former Vifa woofers. What's your impression of the Scanspeak vs. the original?
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I just inherited a mint pair of AR15 with a pair of 8" woofers marked 135372 (sticker in the back) or 111791 (engraved in the back), which were made in 1991 (per the sticker) and supposedly for the old Bose 301. As is, the sound of the AR15 is already superb.
Interestingly, the "Bose" woofers were put in place by Alpha Tech in St. Louis as proper replacement at the time (Alpha Tech's sticker is still in the back). The woofers look like made by Tonegen. So I also wonder if Alpha Tech thought the Bose woofers were suitable replacement for 200001.
Alternatively, are there modern woofers that are good or better replacement for the 8" woofers for AR15? I am in particular interested in the offerings from Dayton sold at Parts-Express.
Finally, AR15 uses a rather complex crossover network. Would the simpler crossover for AR18 work better? I am thinking noting for the woofer (once a proper replacement is found) and just a cap (5-10uf?) for the tweeter.
AR15: mystery woofer - woofer replacement - crossover
in Acoustic Research
Posted
This is just an update. I happen to have some JBL 208H drivers around. These are US-made, 8ohm (measured 7ohm) drivers that were widely used in JBL's speakers in the early 90's -- P50, G500, XE series, etc. Since the fit is perfect, I decided to try them in my AR15. The result was phenomenal, compared to the Bose 8 inchers (which they themselves were not bad at all) -- the sound is coherent, with the right kind of layers/details. I did not sense anything abnormal with respect to frequency transition and sensitivity.
I obviously do not know how the original drivers sound, but these 208H are cheap and widely available. I recommend trying them as an alternative.