David Clark 9100 SERIES, Maintenance Manual

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Tightening of the locknuts where the headband spring meets the stirrup assemblies (or temple
pad assembly for single ear model) will provide a more permanent fit for private issue headsets.
The use of eyeglasses/sunglasses will reduce the attenuation afforded by this device, due to
noise leakage at the points where the temples of your glasses create a gap at the ear seals.
Use of “Stop Gaps”, P/N 12500G-02, on the frame of your glasses is an inexpensive and
effective method of restoring a significant degree of such lost attenuation by reclosing these
gaps.
Behind-The-Head Styles (H9140, H9141, H9140-HT)
For models worn behind-the-head, first separate the hook and pile sections of the overhead
support assembly, spread the headband spring and fit the headset to your ears. Next, pull both
sides of overhead support strap up until weight of the headset is not resting on the top of your
ears, and lock the hook and pile fasteners on the straps together
(see Figure 2)
Figure 2: Headset Donning
– BTH Style Microphone Adjustment