Aadams

I took the challenge and spent some time searching. These don't look like any AR model I can find. Three items: The drivers are wrong. The woofer resembles those used in Kef speakers and the tweeter is unlike any AR driver in the library; no AR ever had wiring directly into the rear of the speaker; the vinyl covering doesn't look right. These could have perhaps once been ARs but they have been modified beyond recognition.

For estimates to rebuild drivers send a Personal message to @RoyCand /or @Chris1this1. They can restore AR3 mid drivers and tweeters that meet threshold repair criteria. Not all mid and tweeter bodies can be restored to health. If all we can know before the purchase is the grills show no sign of removal and the cabinet integrity is not impaired I would offer no more than $300 and that is betting the woofers are cloth surround, way less if the cabs have joinery problems from moisture. I guess I am just too picky. Aadams

I have purchased old Spragues from known and trusted sellers. They work fine. If you have listened to these speakers and can't hear a problem then this cap replacement is precautionary rather than remedial. You could leave the big cans in place and replace all the smaller values. Cap replacement in working speakers is rarely a big payoff excercise.

Those are original Spragues. Crossover has not been recapped.

I think your midrange difference was accounted for in another recent thread. The unit with the resistors is a later engineering change related to a change of woofers. If the resistor mid works use it and keep the other as a backup expecting to add resistors if you use it in these 2axs. The stuffing I would install 18-20 oz of fiberglass torn into large chunks, as did AR, and cover the woofer hole with thin batting, fiber screen fabric or low count linen and be done with it. That wool and especially the cotton will hold moisture.

If you are an attentive listener you will notice the difference, assuming you have a carefully rebuilt original to compare. If you usually listen while being diverted and you use the resistors on the HiVi you may never notice the difference, especially if you don't know how the original is supposed to sound.

Anything will work if you know the correct quantity because all stuffings damp differently. The only proven filling is the original quantity of factory rock wool or its replacement, about 18oz of fiberglass chunks Corning or Johns Manville works. Color doesn't matter. Every other filling is a local experiment. Which tweeter do you have? Provide a photo.

My two cents. Price in the range but $600 is a stretch because of this

Is the seller the original owner? If so what year were they purchased? Are you certain the grills have never been removed?

Have these speakers been recapped? If you are not sure you can post photos of the crossovers, someone here will know the answer. Aadams

It would help if you could provide photos including drivers. Do all drivers operate?

Check your PM box.

Thanks. You have been very helpful. Is there anything else a potential buyer should know about these? I plan to send you a PM.

Thanks. These are not idle questions. Do both cabs have the same caps? Are all the tweeter bodies straight with no cracks or bends? Can you show photos of the backs of the cabs. Does the corner damage affect the integrity of the cabinet joints? When you said you would sell for what you had in them, what was that price? Send a PM if you prefer.

Are the LST2 cabs in as good a shape all over as they appear in this photo? If the woofers are removed could you please provide a photo of the crossover caps, close enough to verify the brand and condition.. Are all six tweeter bodies undamaged?

They are 8 ohm, the same as AR5 mids. Mids for the 12inch woofer are 4 ohm. Your mids are rarer but the market is also smaller.

Is the jumper wire connected between the T and 2 terminals?

We are far beyond practical driving distance. I know the price would be right.

Where are you located? If close enough I would be happy to remove your LST2 burden. Are the tweeters all original? Do all the mids operate? Adams

With a Hivi AND the dome mid set up with zero attenuation you are going need a lot of furniture, drapes and carpet.

I have a vintage Mac amp that measured 130watts at the Powerguard trigger, when it was refurbished two years ago. It is fed by a Mac Preamp that sends the same program source to 2 Crown XLS amps all connected to 12 inch ARs. There is no audible difference. I agree, amplifiers do not all sound the same but in this case they do.

The Crown XLS is a good choice. You can find outstanding pre-amps in old high end 5.1 receivers that allow you to bypass signal processing, such as this Sony ES model for $99 or best offer. Tone controls on these units are not straight forward. Adams

Current advice is inductor only. This thread has everything you need.

This is the second pair of Classic ARs I have turned to the bookshelf position for which they were designed. Both pair were turned sideways to address sound stage width but they also sound clearer. With the first pair I accepted it was my imagination but with this second pair I am convinced the sound is better with the cabs turned sideways. Also, if you like live performance jazz recordings that are both technically and musically excellent here is one from 2019.