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Multi-Way Conventional loudspeakers with crossovers

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Old 8th June 2012, 02:43 PM   #11
Gudmund is offline Gudmund  Iceland
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Default AB Tech Services

Quote:
Originally Posted by speakerdoctor View Post
Nice resto job gudmund, but how is this going to help satinmill? He missed out on another pair of 3a's and now has no working mids and tweets to work with.
The Super-mod is the answer.
Well, one could look at AB tech Services at:

Acoustic Research Parts From the same Manufacturer AR has been using since 1983!

and one could mail the manager Mr Barsotti at AB Tech Services for replacement units when one can afford to buy them ( be patient and buy one unit from time to another):

abarsotti@mindspring.com

The midrange dome sounds ok without too much sound decrease , price 99,60$
the tweeter is sold for 62,50$
Another way is Ebay and buy the midrange speakers there!

Rgds.

Last edited by Gudmund; 8th June 2012 at 02:46 PM.
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Old 8th June 2012, 03:01 PM   #12
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Originally Posted by SatinMill View Post
I restored these ages ago, cosmetically they're a bit messy but functionally they're in good shape.

I used original domes and some newer soft dome tweeters and I rather like the results.
Well, considerable time has indeed passed since your OP's, but that's good news you had success with your resto as well!

If one visits classicspeakerpages.net and does some research, one finds the consensus on ABT drivers is they are great looking and fit perfectly.

Sound performance, OTOH, is deficient vs original drivers.

Last edited by speakerdoctor; 8th June 2012 at 03:17 PM.
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Old 8th June 2012, 03:09 PM   #13
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I find they're good enough, it's not my main pair so not a huge priority.
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Old 8th June 2012, 03:23 PM   #14
system7 is online now system7  United Kingdom
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Quote:
Originally Posted by SatinMill View Post
I restored these ages ago, cosmetically they're a bit messy but functionally they're in good shape.

I used original domes and some newer soft dome tweeters and I rather like the results.
Ah, a bit disappointed at the lack of detail there, my friend. Photos would be nice. I'm always interested in AR designs, which certainly got something extremely right. To a modern eye they look unsophisticated, especially the paper tweeters. But recall the AR-3A was one of the most respected speakers of its time using the now unfashionable acoustic suspension bass.

Without having done any modelling of some of those simple crossovers, it certainly looks like they were quite a lot more time-aligned than other designs. They also seem to have less places for energy to be stored, resulting in a very immediate and lively presentation.

What I'm getting at, is that one approach is to seek out the original drivers and similar crossover components. The other is to fully understand how the design worked, and use modern components with the same properties. For instance it stands out to me that the AR3-A used paper dome tweeters. Now that is interesting. I don't know what the midrange domes were made of, do you?
Attached Images
File Type: jpg AR3-A_Cabinets.JPG (25.1 KB, 186 views)
File Type: jpg AR3-A_crossover.JPG (80.4 KB, 180 views)
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Old 8th June 2012, 03:36 PM   #15
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I took some photos at the time, i'll see about digging them up later with a bit of commentary on what I did.

I just installed the new drivers, fixed some wiring faults in the crossovers, cleaned out the pots and put it all together again. The only tricky bit was sealing which required some new gaskets which I just cut from a foam packing bag. The surrounds are cloth not foam so did not need replacing.

I still prefer my big Celestion 662, but they came out surprisingly nice for a pair of their age
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Old 8th June 2012, 03:51 PM   #16
system7 is online now system7  United Kingdom
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The Celestion 66, which I know well enough was not a million miles away from the AR-3A. I notice a third order tweeter there. It so depends on the acoustic rolloff of the drivers, but both have something going for them.

For sure putting a dome midrange next to the tweeter is a sweet combination.
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Old 8th June 2012, 03:55 PM   #17
Gudmund is offline Gudmund  Iceland
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Quote:
Originally Posted by system7 View Post
Ah, a bit disappointed at the lack of detail there, my friend. Photos would be nice. I'm always interested in AR designs, which certainly got something extremely right. To a modern eye they look unsophisticated, especially the paper tweeters. But recall the AR-3A was one of the most respected speakers of its time using the now unfashionable acoustic suspension bass.

Without having done any modelling of some of those simple crossovers, it certainly looks like they were quite a lot more time-aligned than other designs. They also seem to have less places for energy to be stored, resulting in a very immediate and lively presentation.

What I'm getting at, is that one approach is to seek out the original drivers and similar crossover components. The other is to fully understand how the design worked, and use modern components with the same properties. For instance it stands out to me that the AR3-A used paper dome tweeters. Now that is interesting. I don't know what the midrange domes were made of, do you?
Well, the inventor of many hifi things and among others the "dome" , mr. Edgar Villchur, who was the founder of Acoustic Research unfortunately died autumn 17. october 2011.
His paperdome and coil in the AR3 and AR3a tweeter is situated with only 3 dots of an unknown glue, and deliver/delivered a wide soundperspective which in the 1950 'es was very difficult to obtain with elipse or round papercone speakers. The midrange has a fabric clothdome and a piece of something like glasswool to reduce reflections. Mr Villchur used a lot of time and messurement to get the three units in the AR3a to work together. Because of this work the crossover became rather simple, and the AR3a produces easily what we all like: "A very presize stereo window".

The sound from AR3a is authoritative and one of the best...I think. Try " Jet Set" with Grateful Dead, then you know what I mean.
Rgds.
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Old 8th June 2012, 03:56 PM   #18
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You've reminded me of something I've been meaning to do for some time, which is remove the crossovers and draw out the schematic for them, note they're 662 not 66 so they differ to some degree. I've never found full proper specifications of crossover schematic for the 662.

I've had them for a few years now, keeping them in repair has been somewhat more exciting though not challengingly so, one of the tweeters blew so I took it apart and rewound the coil, the mid dome also became misaligned and was easily fixed by centring it. I wrote both repairs up and I believe they're in my post history.
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Old 8th June 2012, 04:39 PM   #19
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Originally Posted by Gudmund View Post
Because of this work the crossover became rather simple, and the AR3a produces easily what we all like: "A very presize stereo window".
Just a pity they did not made mirrored pairs, like the 303.

Roger
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Old 8th June 2012, 04:57 PM   #20
Gudmund is offline Gudmund  Iceland
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Just a pity they did not made mirrored pairs, like the 303.

Roger
Yes, you are right! mirrored pairs would have been better....I think.
I have a very rare pair spare set of AR3a in light birch veneer, and I like the dark rosewood better. My thought was to built a new pair of AR3a cabinets by use of MDF hardwood and with dark rosewood veneer. At this point it was possible to make them mirrored.
Rgds.
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