How to Refoam Acoustic Research AR9LS Loudspeakers

[@bpalpha]

I did this for a pair of Infinity speakers. This is a messy, arduous, and somewhat dangerous process (razor knife) which looks a lot easier on videos. I love the idea of bringing a damaged loudspeaker back to life, but know what you're getting in to. By the way, I did all this only to find one of the woofers on the pair of speakers was dead!

[@pay9011]

I did this to my jbl l-60t speakers. After non usage for about 20 years they sounded really bad. Nearly all of the foam had disintegrated. It was one of the most satisfying diy project ever.... because it really made a huge difference (ie back from the dead). I just went very slow at each step. If you think you might run out of the provided glue you can use Aleene's Original Quick Set Tacky Glue. It's cheap and sold everywhere.

[@danc2014]

Red and black polarity is important to phase the speaker movement. You will lose bass response if done wrong. Why did you run the signal in then move the cone while applying the glue? Should you rerun the signal before the glue sets?

[@RobertR3750]

How do you know what direction to move things when it buzzes?

[@fredgien]

What did you do with the foam piece at the bottom?

[@Tech101yt]

8:41 if you connect them wrong, the coil will be attracted to the magnet, instead of repelling the magnet.

[@ettermago]

Hi. Thanks for the excellent video. Which glue did you use?

[@remanebamus]

It came with the kit, but seems to have the same consistency as Aleene's Tacky Glue

[@alejandrocervantes4981]

I recently acquired a set of those and need refoaming too. How do you like the sound after having them refoam? Are they worth refoaming? Have tinkered with the crossover?

[@poormanselectronicsbench2021]

Although I do not own 9LS speakers, I do own AR90's and AR11's, and had listened to AR3A's for years long ago in the past. All are well designed speakers, and if you have original drivers with undamaged voice coils it's definitely worth keeping the originals and replacing the surrounds as a first choice, as you will not find an "exact" replacement with the same specifications as the originals, even if they are advertised as such. The AR11's I bought used, and, someone threw out the original 12" drivers and cut the edges of the basket's mounting flange in order to get a totally wrong 8 ohm cheap woofer installed into them. The "correct" replacements are currently $175, and on back order, and since the cabinets have slight damage to them I have sourced fairly well matched, but not exact replacements to them to get them back into working order, but mods to the cabinets are being done to get them to fit. Proper replacement surrounds are also fairly inexpensive compared to a full driver assembly, but make sure they "roll" part of the foam is sized correctly, as these are "high excursion" woofers and need a bit larger foam than a generic kit will have.

[@colbylaro9361]

Was the upper woofer sharing air space with the downfiring woofer? Where can one find pictures of the design of ar9s?

[@arksurvivalevolved9190]

What do you think would be best if we have to change the cone ring on a subwoofer, use rubber or foam ring?

[@fredgien]

Foam.

[@robertromero8692]

I used to have a pair. The foam did disintegrate, but I didn't feel like trying to refoam them.

[@poormanselectronicsbench2021]

Holding the cone up with pencils like you did was a well thought out idea! I did like how you grew an extra pair of hands at one point though 🤣🤣🤣

[@florinmoldovanu]

Does anyone know what LS stand for. I'm currently looking at a pari of AR18LS on facebook but don't know if there is any difference in the audio comparing to the AR18S or whether the LS only stands for the colour variant of the same identical drivers / crossover combo.

[@poormanselectronicsbench2021]

The original "LS" acronym on Acoustic Research speakers stood for "Laboratory Standard", which was a marketing ploy of course, but it tried to designate that the speakers had a very "flat" frequency response. The first Acoustic Research speaker to use this name was the "AR LST", Which stood for "Laboratory Standard Transducer" and was the top of the line offering from them when made.

[@florinmoldovanu]

@@poormanselectronicsbench2021 nice. Thank you very much!

[@joeygonzo]

50 hz sine waive tone is used to center the cone

[@aldo9887]

Salve, : Bella trovata quella del gruppo magnetico “ quadrato “, ma dalla AR questo non me lo sarei mai aspettato.-