HP HDX 18 Maintenance And Service Manual page 82

Remove the subwoofer:
1. Remove the three Phillips PM2.5×5.0 broadhead screws 1 that secure the subwoofer to the base enclosure.
2. Remove the subwoofer 2 by lifting it straight up.
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The rubber grommets 3 should be inspected and replaced in the correct locations 4 on the subwoofer. These
grommets are critical for satisfactory subwoofer performance.
Reverse this procedure to install the subwoofer.
Removal and replacement procedures 4–49