Speck Electronics X.Sum - Manual (Page 13)

Chapter 2 Installation & Setup 9
Due to the high performance of the X.Sum, it is recommended that you use
only the highest quality audio cable. A high quality cable by definition is a
cable that provides good mechanical strength, high microphonic noise
immunity, high frequency response, low crosstalk, and 100% shielding ability.
All audio cable used with the X.Sum should be a 3 conductor foil shield type
(2 inner conductors and a shield drain conductor). It is not recommended that
the 2 conductor "off the shelf cables" be used.
All wire and cable interfaced to the X.Sum should be terminated with high
quality connectors. A ¼" plug or XL connector should make a positive
connection to its respective mating jack and provide adequate strain relief to
its cable. All connectors should also have a metal shell to provide 100%
shield for exposed conductors.
To clean the front panel, wipe the surface gently using a soft lint-free cloth to
avoid scratching the panel or markings. Paper towels are not recommended.
Commercially available window cleaner solutions may be used; however, the
solution should be applied to the cloth and not the panel to avoid the seepage
of liquid to the inside of the enclosure.
Do not use brushes or feather dusters to remove dust. This may cause dust to
fall into the openings around the pushbutton switches.
Cleaning