Wyred 4 Sound mPRE - Manual (Page 12)

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to disconnect the inputs to your amp. If the noise is not present when the inputs
are disconnected from either component, try putting a cheater plug (ground
isolator) on one component at a time in order to locate the source of the ground
loop. Once the source is located you can contact the manufacturer for further
information regarding a solution. NOTE: We only recommend using a ground
isolator for trouble shooting purposes, and should be removed after the problem
has been found and resolved. Having the ground of any unit disconnected can
potentially create a dangerous situation.
An easy way to locate a noisy component is to replicate the problem then
start disconnecting components one at a time, starting with the source end of your
system. Digital cable boxes and satellite receivers are notorious for making ground
loop hum. This is normally caused by the potential difference on the input wire
(shield side) for either of the boxes when referenced to ground. If this is the case in
your system, the installation of an isolating transformer would be the easiest
solution and are normally readily available at your local electronics parts store. A
better solution is a power strip with grounded and surge protected F-connectors
that you can pass your cable or satellite signal through.
Warranty coverage
Wyred 4 Sound’s warranty obligations are limited to the terms set forth below:
Wyred 4 Sound, as defined below, warrants this Wyred 4 Sound-branded hardware
product against defects in materials and workmanship under normal use for a period of
FIVE (5) YEARS from the date of retail purchase by the original end user purchaser
("Warranty Period"). If the product has been transferred from the original owner to a
second hand owner it has a ONE (1) YEAR warranty, valid from the original date of
purchase by the original owner. If a hardware defect arises and a valid claim is received
within the Warranty Period, at its option, Wyred 4 Sound will either (1) repair the hardware
defect at no charge, using new or refurbished replacement parts, or (2) exchange the product
with a product that is new or which has been manufactured from new or serviceable used
parts and is at least functionally equivalent to the original product. Wyred 4 Sound may
option that you replace defective parts with new or refurbished user-installable parts that
Wyred 4 Sound provides in fulfillment of its warranty obligation. A replacement product or
part, including a user-installable part that has been installed in accordance with instructions
provided by Wyred 4 Sound, assumes the remaining warranty of the original product or
ninety (90) days from the date of replacement or repair, whichever provides longer coverage
for you. When a product or part is exchanged, any replacement item becomes your property
and the replaced item becomes Wyred 4 Sound's property. Parts provided by Wyred 4 Sound
in fulfillment of its warranty obligation must be used in products for which warranty service
is claimed. When a refund is given, the product for which the refund is provided must be
returned to Wyred 4 Sound and becomes Wyred 4 Sound's property.