dxho
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Posts posted by dxho
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Some discussion in Audiokarma that I cannot find now. I believe it
was Christian Vorius who finally commented he had tried them and
they do not sound like the originals. -
The domain aphenos.net is broken beyond my immediate skill
level, and I'm not interested in learning how to fix it. So...
archive.org has what you need. The KLH & AR links should
still work.https://web.archive.org/web/20231206230754/http://www.aphenos.net/electronics/speakers/klh/AR_Drawings_.html
or http://tinyurl.com/AR-drawings -
The articles say Vilchur came up with the idea on his own and
patented it by 1954.Not sure what you mean about fiberglass in AR enclosures.
There was none of which I'm aware, at least through 1970
and probably much later.As far as I can tell, Kloss never used foam in (I assume you're
referring to) speaker surrounds in KLH speakers. Also he
licensed the acoustic suspension technology from AR, starting
in 1957 when he created KLH. -
Wikipedia has details on AR and AR's patent.
Wikipedia has further details on this patent in the article on
Edgar Vilchur. Various manufacturers licensed the IP until
Electrovoice refused to pay royalties and sued AR. They
claimed prior art, though by whom is not mentioned. Anyway,
AR lost and the patent was voided. -
Looks like you have a replacement for the early 10" cloth surround woofer.
They have 6 holes and an ~11" frame. The later original is a ~10.25" frame
and 4 holes. -
The date is likely 1968 which correlates fairly closely to that 77xxx serial.
The last early AR-2ax was serial 125000 in 1970. -
Looks like some helpful information in this thread.
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I'm guessing you heard about my database second or third hand. Link to the left.
The very earliest (60-61-62 maybe) Model Sixes had surplus oil-in-metal caps. (By
the way, I have some ARs with those, and they needed replacement) There is no
database specifying when KLH used them to my knowledge.Yours were probably built in 67 or 68, well into the paper cap era. Guaranteed they
will need replacement if they're original (Callins with black body and red ends). -
Got it
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Unique picture! Have not encountered this before. The one on the right appears to have
the early style glued-in drivers, a la Model One, Two, Three, Four, and Six. These were
apparently built as KLH was shifting to removable speakers. The Seventeen came later
and never used the glued drivers, but it looks like cabinets were the same size.I would like to also see the rear (terminal plates and serial numbers).
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I'd probably go through the front first, just to confirm the crossover is in
the original location, or even exists. No telling what other mods have been
done to these. -
Looks like an AR-2a grill. If it is a 2a, the back has been veneered, and
nicely so, it would appear. Have you looked on the bottom to see if the
terminals are down there? -
Ok, yeah. I had the same curiosity about the Fours and did basically
the same thing. It even extended to the Model One, a pair of which
I did finally buy. However I eventually let the Model Fours go. They
just couldn't keep up with the AR-3a. -
Most of the Model Fours, like the early Model Sixes, had a grill cloth wrapped around the
motor board that was glued and screwed into the cabinet. Typical recap operation requires
knocking the glue plug under the rear terminal plate out. The switch and most of the caps
and buried in it.The motor board can sometimes be knocked forward and out from the back. Or it's often
easier to just cut the cloth so the woofer surrounds can be resealed. They are usually dry
after ~60 years, costing the system bass response from the resultant air leaks.The factory just screwed in screws and yanked the motor board out. Either way, a new grill
board will need to be made.There are many more threads on this repair done to the Sixes; it's the same procedure
with the Fours. Both systems sound very much alike. Don't pay a premium when the Sixes
are far more readily available. -
I converted a pair of 2s to 2xs with 2ax midranges (and panels I built). No crossover
change needed.
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Yes, your pots are in great shape and might serve you well.
There are so many choices on caps. Dayton caps from parts-express.com
are a good, middle of the road start. There are probably hundreds of posts
on other choices, though, so it's easy to get overwhelmed.If the surrounds are not dried out, they may not need sealer.
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According to the label: 5 watts minimum... That's what I'd go by.
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https://worldradiohistory.com/. Buyers guides from HiFi Stereo and a couple of
others. What more information do you need? The label pretty much covers it.These probably sold in such low numbers that you're not likely to find out much more.
Shouldn't take anything exotic or especially powerful to drive these.Here's the buyers guide listing, somewhat different than the label. I'm guessing the
buyers guide had the higher crossover point wrong. I see why the label doesn't have
the frequency response: ±9 dB?Tuned-port speaker with 10-in woofer. 5-1/4-in midrange. and a 3-in tweeter. Power
range 5-70W rms; FR 49-22,000 Hz ±9 dB; sens 90 dB sPL/W/m; imp 8 ohms;
crossover points 900 and 1400 Hz. Oak vinyl finish. 27 x 13-1/4 x 10-3/4 in $380/pr -
There are two options in re: grill cloth:
knock or push the front baffle out of the box from the rear
or build molding for the grill cloth after you cut it
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1989-1990 ~$380/pair when new
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Steel wool can leave fragments that get pulled into driver magnets and
sometimes stain the wood if (when) they rust. -
Models Twelve and Twenty Three tweeters are equivalent.
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The cloth surround woofer has a outer frame diameter of ~11"; the later woofer is about 10.25".
But, yeah, you could swap if the speaker baffle was modified.
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My first ARs were this model, and after many years of attempting to wake up
the stock configuration (original tweeters only make to about 13khz), I converted
them to AR-2x. This was a factory option from about 1964.It's just the AR-2ax midrange in an adapter plate that you'll probably have to make.
The crossover doesn't need modification, though I would renew the capacitor(s).
Even the metal caps didn't hold up to the years. The sound is satisfactory to me now.Hard to tell the difference in cabinet color from your photos.
Aphenos ar database is mia
in Acoustic Research
Posted
Yeah, it's borked, and I don't have the energy and/or skill to fix it.
However, there's a copy of the site at archive.org that should
be more or less eternal.
Also, links to the AR and KLH sections are under the graphic on
the left side of my posts.