422
5
InstallationChapter 4
Before you plug the 422 into a wall socket, carefully read the information in the following chapter.
AC Line connection in countries outside of the European Community
A sticker on the right end of the unit indicates the nominal voltage setting for the unit as it left the
Symetrix factory. If this does not correspond to the voltage setting for your locale then do not
attempt to apply power to the 422. Instead, return the unit to your local Symetrix distributor for
modification.
The 422 is shipped from the Symetrix factory with a detachable AC power cable (IEC standard)
included. Depending on the intended destination, the power plug is either the US type (intended
for 117vac use), or the Europlug type. If the power cable s plug is not right for your locale, then
please contact your local Symetrix distributor for the proper cable.
Once you have determined that the 422 s operating voltage matches that of your locale and you are
ready to begin, follow these steps:
1 Plug the socket end of the power cable into the recessed AC power receptacle on the back of
the 422.
2 Plug the other end of the power cable into a three-hole grounded outlet or power strip.
Warning The 422 is intended to be electrically grounded. It has been provided with a
three-wire grounding plug - a plug that has a third (grounding) pin. This plug
will fit only a grounded AC outlet. This is a safety feature. If you are unable to
insert the plug into the outlet, contact a licensed electrician to replace the outlet
with a properly grounded outlet. Do not defeat the purpose of the grounding
plug!
Mounting in an equipment rack
The 422 occupies one rack space (1U) in a standard equipment rack with a width of 19" (48.3cm),
a depth of 7.5"(19.1cm), and a height of 1.75"(4.45cm). Allow at least 4"(10.16cm) behind the unit
for the protrusion of connectors. We recommend you take care not to mount the 422 next to
devices that emit large electromagnetic fields, such as audio power amplifiers. To do so may
compromise the noise performance of the 422. The 422 has been designed to conform to mechani-
cal guidelines as described in EIA Standard RS-310-C and IEC Recommendation 297.
Recommended audio cable wiring
For optimum system performance we recommend that the 422 be connected to balanced signal
sources. If this is not practical in your situation, then you may connect to unbalanced sources. The
diagram on the next page illustrates recommended cable wiring practices.
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