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Old 6th December 2013, 07:53 PM   #1
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Join Date: Dec 2013
Default Acoustic Research AR 9 rebuild

Starting a rebuild of a set of Acoustic Research AR 9s.

Structurally the towers are in good condition, but all speakers inside need refurbishing/replace.

I do not know where to start. Is it even worth it? My wife thinks it is not. The project guy in me thinks it will be fun and a good learning experience.

Where should I start?

I will need 4 woofers I know that for sure. I don't know what kind to buy. I would like as close to factory or better.

I think the tweeters are good. I really cannot tell. (How do you tell if you need new tweeters)

All of the mids need replacing (I think there are two different kinds of mids on each tower), I do not know where to start.

Any guidance on the subject will be a great help.
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Old 6th December 2013, 07:59 PM   #2
tinitus is offline tinitus  Europe
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clever wife you have

sorry, not funny, but couldn't resist
sometimes we know very little, and sometimes we know too much
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Old 6th December 2013, 08:14 PM   #3
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Join Date: Feb 2010
Acoustic Research - The Classic Speaker Pages Discussion Forums
Go to the above site which is the AR classic speaker rebuild page and look for what you want or follow the links as it relates to your AR9.

As far as replacement speakers look up Acoustic Research Parts From the same Manufacturer AR has been using since 1983! for the speaker types you might want or use as replacements. These are about as close to original as you can find.

Suggest you download this document so you can understand what you are up against in doing the update for the AR9. The document is specifically for the AR3a and some of the info may apply to your needs.
Restoring the AR-3a | The Classic Speaker Pages

I have got my replacements for my AR3a from AB-Tech and have had no issues.

A very worthwhile winter project.
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Old 6th December 2013, 08:20 PM   #4
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Join Date: Feb 2010
Here is a current diyaudio post on updating the crossovers for an AR3a. Same basics will apply to your AR9 rebuild

AR3a X-Over Cap Question
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Old 15th January 2014, 07:03 PM   #5
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Join Date: Apr 2011
Location: Pretoria
Has anybody here tried their hand at building AR9 clones from scratch? With the drawings now in the public domain and all the drivers available, it seems doable. It won't be cheap or easy but the results should be worth it.
Electronic equipment is filled with magic smoke that makes it function. When it escapes, the device no longer works.
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Old 15th January 2014, 09:33 PM   #6
sreten is offline sreten  United Kingdom
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Join Date: Nov 2003
Location: Brighton UK

Refoaming the original drivers is much better than replacing.
Recapping old electrolytics is a good idea. 4 bass units and
2 lower mids will need refoaming. Mid and treble should be OK.

rgds, sreten.
There is nothing so practical as a really good theory - Ludwig Boltzmann
When your only tool is a hammer, every problem looks like a nail - Abraham Maslow
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