View Full Version : Lansaloy DOT3 Surround Treament for LE-14A and others

01-23-2010, 03:53 PM
Since it has been about 15 months since I last treated my woofers in my L101’s, I thought I would record the procedure and post a helpful thread on applying DOT3 brake fluid treatment to you old Lansaloy surrounds. These are common on the LE-14A and others from the mid 50's to 70’s. By the way, this is just the way I do it, there are other ways and very helpful threads here…

http://www.audioheritage.org/vbulletin/showthread.php?t=871&highlight=dot3 (http://www.audioheritage.org/vbulletin/showthread.php?t=871&highlight=dot3)

http://www.audioheritage.org/vbulletin/showthread.php?t=5424&highlight=dot3&page=2 (http://www.audioheritage.org/vbulletin/showthread.php?t=5424&highlight=dot3&page=2)

The problem is the Lansaloy can get very dry and brittle and therefore crack and break completely. Of course when that happens you need to install a new surround kit, but they do not make a Lansaloy surround replacement, so you must use a standard foam surround replacement in that case. There is a helpful thread here http://www.audioheritage.org/vbulletin/showthread.php?t=469 (http://www.audioheritage.org/vbulletin/showthread.php?t=469) on how to do a new foam surround.

If your Lansaloy surrounds are not yet brittle and cracked, you can treat them with DOT3 brake fluid and they will soften up quite well and the sound will have a huge improvement as well. It is not known how long you can continue to treat them, but many have been doing it for years without having to replace the surrounds. You should treat your Lansaloy surrounds annually in order to maintain proper pliability and retain optimum sonic performance. Of course your first step is to remove your grills and dismount the woofer from the cabinet. Be very careful here to handle your grills and woofers carefully in order to avoid nicks and scratches. Once you have the woofers out, place them on a work surface with plenty of light.

01-23-2010, 03:59 PM
You will need 2 QTips, and a very small amount of DOT3 brake fluid(about a capful or less).

01-23-2010, 04:04 PM
Simply apply the DOT3 brake fluid to the surround being careful not to get any on the white aquaplas coating on the woofer cone as it will make stains that cannot be removed. Apply a generous portion all the way around the surround until it has been coated thoroughly.

Allow it to sit and absorb for twelve (12) hours at room temperature. Once it has been fully absorbed and is no longer shiny and does not appear wet, flip the woofers over and apply the same procedure to the rear side of the surround.

Allow the brake fluid to absorb another twelve (12) hours. Carefully remount the woofers into you cabinets. Your done! That was easy.

This may seem like a pain in the rear, but you will have a noticeable improvement in the performance of your grand old JBLís. You wonít be sorry. This is especially helpful if you have a pristine pair of vintage JBLís that are all original because it will help you retain their original condition and optimum resale value. Happy listening.!