JBL 4408 PDF

In a former life, I worked in professional audio sales and service for a local music store. This was about a million years ago, and the store, Musicmakers Austin, is long gone. I worked mainly with keyboards and related equipment, selling dreams and repairing the equipment when the dreams failed. The modest pay was also offset by the opportunity to buy gear at a discount for my own studio — never mind that that further ate into my take home.

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In a former life, I worked in professional audio sales and service for a local music store. This was about a million years ago, and the store, Musicmakers Austin, is long gone.

I worked mainly with keyboards and related equipment, selling dreams and repairing the equipment when the dreams failed. The modest pay was also offset by the opportunity to buy gear at a discount for my own studio — never mind that that further ate into my take home. In this fashion, I was able to equip my studio with keyboards, mixers, recording decks and sound systems. Many decades later, I still have some of that gear. During the era I fell in love with JBL speakers and eventually paid too much for a pair of monitors.

Many mixes were made on these studio workhorses. Time had not been kind to them however, and parts deteriorated over the years. A sad day. I had almost resigned myself to replacing them when an Internet search turned up a number of speaker repair options. Sending the s to a Dallas repair shop seemed too extravagant.

Then I discovered The Speaker Exchange. They provide reconing and other repair services for a range of classic speakers. With parts available and videos showing the process , I was ready to start. Just a sharp utility knife and some patience. The old foam surrounds must first be removed.

In my case they mostly just crumbled when I began cutting them away from the cone. Care must be taken to not damage the cone, or the repair becomes much more expensive. Next, the outer gasket is removed by cutting the glue bead between the steel basket and the gasket. They came out easily, and much of the remaining glue can be removed with a scraper. I used an automotive gasket scraper with success. Now, a bead of contact cement is applied to the outer edge of the cone, using the glue nozzle to spread the bead to the approximate width of the foam edge.

The glue will become tacky in a few minutes, and you apply the new foam surround taking care to center it on the cone. The dust cap is now removed. Extreme care must be used to avoid damaging either the cone or the tiny wires leading to the voicecoil. Once removed, the inner magnet piece and the inside of the voicecoil become visible.

Four paper shims are now slid between the magnet and voicecoil. This is to center and stabilize the speaker assembly. A bead of contact cement is now applied to the steel basket where the gasket was removed.

The foam is now pressed i nto the glue. After letting these glue joints dry for an hour or two, we can remove the shims and check to see that the speaker cone moves freely. Now, contact cement is applied to the edge of the new dust cap and pressed over the voicecoil to reseal the assembly.

Lastly, the gasket is glued back in place. After years of marginal and sometimes ragged sound, the result was magic! I had forgotten how good the combination could sound. Why did I wait so long to repair them? View all posts by Jim. This site uses Akismet to reduce spam. Learn how your comment data is processed. Skip to content.

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1 Pair of JBL 4408 Studio Monitor Speakers Tested and Working

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JBL 4408 your thoughts please

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JBL 4408 Studio Monitors — Repairing the Woofer Foam Surrounds

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