How to Restore JBL L100 Speakers

Written by keith patrick
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How to Restore JBL L100 Speakers
The L100 can produce up to 50 watts of sound output. (speaker image by gajatz from

JBL L100 speakers were one of the best selling speaker models of the 1970s. (See Reference 2) Many audiophiles refer to the L100 as the "Century Speaker." The L100 gained popularity as a monitor speaker for professional recording studios. JBL began producing the speaker for home use in 1974 because of strong demands from musicians who wanted to use the speakers at home. (See Reference 1) You can restore the JBL L100 speakers by cleaning off the speaker cone, replacing the speaker grills and attaching a new power supply.

Skill level:

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Things you need

  • Flathead screwdriver
  • Utility knife
  • 12-volt power supply
  • Soft cloth
  • Cleaning solution

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  1. 1

    Clean off the speaker cone and internal components. Insert a flathead screwdriver into the gap between the speaker's front grill and the wood casing. (See Reference 1) Push forward lightly on the screwdriver's handle to pry the grill away from the speaker body. Pull off the grill from the speaker's casing with your hands. Dab a soft cloth in cleaning solution. Wipe away all dust and dirt on the speaker cone and electronic parts inside the L100.

  2. 2

    Replace the L100 speaker grills. If the grills contain any scratches or tears, you should replace them. JBL no longer makes the original L100 speaker grills, but they offer an alternative cloth grill. (See Reference 3) Call 1-800-336-4JBL and tell a customer service rep that you would like to order part number #G100-CLOTH. (See Reference 3) Bring the L100 and new cloth grills to a JBL service centre to have them refitted onto the speaker.

  3. 3

    Attach a new power supply to the speakers. The L100 requires a 12-volt power supply. (See Reference 1) Purchase a 12-volt supply with a circular end from a consumer electronics store. Detach the current power supply from the speaker. Insert the circular end of the 12-volt supply into the circular input on the back of the right L100 speaker.

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