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AR-9 First Restoration


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Hi Everyone.

I'm working on my first pair of AR-9s. My question today is about the wadding material. Attached is a picture of the material that is in there now. The larger cabinet has the same material. Is this the correct material for these cabinets? I've only ever worked on earlier models of ARs and none had material like this. I'm wondering if this is replacement material since the LMR woofers had been replaced at some point. Thanks for your help.

-George

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1 hour ago, meta_noia_fot said:

I'm wondering if this is replacement material

YES.  That is the correct stuffing for the AR9 series.  That cavity was stuffed very densely, specifically for the original 8" midrange driver.

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Maybe somebody can explain to me why the upper three drivers have poly fill stuffing, but the lower dual woofer and crossover area is empty.  

 

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The woofers and crossover area of the AR9 and AR90 is left empty on purpose (i.e. no poly-fill material). There is a thread on this site about it. The Tim Holl white paper on engineering the AR9 might also shed some light as to why. I believe it is an isobaric chamber.

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  • 2 weeks later...

Thanks for all the help previously, everyone. I'm in need of some more advice.

1. How should I attach new grill fabric? The previous owner had the fabric replaced at some point to a tan fabric (I hate it). The larger grills have the fabric attached just using glue. The smaller, side grills appear to be glued with a chrome frame stapled onto the grill (I assume this is the chrome piece I've seen people talk about omitting on other threads). If there is supposed to be chrome frames on the larger grills, they're missing. I've only replaced grill fabric on one set of speakers before (AR-6's) with sub-optimal results. And the only hi-fi store near me doesn't do grill fabric replacement unfortunately. If glue, any suggestions for a glue/fabric combo? Or should I just get a power stapler?

2. What about speaker spikes/feet? I noticed there are screw threads on the bottom of each speaker. Does anyone know a spike set that fits these threads? Or what the thread measurements are? I figure elevating the speakers may help keep the floating floor I'm on from vibrating during heavy bass passages.

3. Finally, any advice on placement in a small room? The centers of the vertical arrays are about 7 feet apart. Unfortunately there isn't much room between the LF woofers and the walls and a record shelf (see pic).

Thanks again for all your help.

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1 hour ago, meta_noia_fot said:

If there is supposed to be chrome frames on the larger grills,

No.

The original black fabric was stretched and stapled around the entire perimeter of the large grill.  Same with the woofer grills.  But glue would work as well if you are careful and patient.

Regarding placement.  You have plenty of room and enough options.   You don't need spikes but you could use adhesive felt pads to ease movement on the wooden floor.

Those baseboard heaters being so close would concern me but others may know better.

 

Above is a link to an AR 9 ref manual download.  Read the section on speaker placement.

Adams

 

 

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Thanks @Aadams. I think I'm experiencing the slight bass boost below 100hz the manual mentions. I'm going to experiment with EQ-ing the bass a small amount. 

1 hour ago, Aadams said:

Those baseboard heaters being so close would concern me but others may know better

 

I know in the winter I'm going to need to pull them at least a few inches away from the heaters. I'm also going to insulate those wires. The room, like the speakers, is a work in progress.

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