Adcom GFA-5400 - Manual (Page 4)

^IGHT/LEFT INPUT O
The audio inputs to the GFA-5400 are through two high quality, goid piated RCA jacks to minimize high frequency
losses, noise. Etc. They will accept standard RCA type plugs, one for each channel, LEFT and RIGHT. To ensure that the
performance designed into the GFA-5400 is realized, you should use the highest quality cables feasible. Whatever cable you
finally select, it should have low capacitance. This is particularly important if you use a long run between the preamplifier and
amplifier. Generally speaking, a cable with a capacitance of less than 100 pF will work best.
The load impedance which the GFA-5400 inputs present to the source preamplifier or tuner-preamplifier is 49.9k
ohms. This load impedance results in minimal amplifier noise when used with a source component of low output impedance
such as an ADCOM preamplifier or tuner/preamplifier. To preserve the correct stereo image, please be certain to connect the
left output of the preamplifier or tuner-preamplifier to the RCA jack on the GFA-5400 labeled LEFT INPUT and the right output
of the source component to the RIGHT INPUT jack.
RIGHT/LEFT OUTPUT ©
The GFA-5400 is ''polarity correct" and does not invert phase. That is, any positive going signal at its input will appear
WARNING
Whenever connections to or from the GFA-5400 are being made, be certain that the AC on/off switch of the amplifier
is in the off position, the AC cord of the amplifier is disconnected from the AC wall outlet and that all associated
components are turned off.
as a positive going signal at its output. The GFA-5400’s connections to the loudspeakers are made through two high quality,
five-way, gold plated binding posts located on the rear panel. These terminals will accommodate bare wire, tinned wire, terminal
pins, spade lugs or banana plugs, both single and dual. These output terminals are color coded RED and BLACK to indicate
polarity. To ensure correct stereo phasing, you must connect the RED output terminal (labeled “+”) to the loudspeaker input
terminal color-coded RED (or labeled P O S I T I V E , P O S , 8 OHMS or 4 OHMS). The BLACK binding post terminal on the
amplifier (labeled should be connected to the loudspeaker input terminal color-coded BLACK (or labeled NEGATIVE,
NEG, C, COMMON, G, or GROUND).
The RIGHT OUTPUT should be connected to the right channel loudspeaker, as you face the pair of loudspeakers, and
the LEFT OUTPUT to the left channel loudspeaker.
In order to ensure that connections to the loudspeakers are correct, you must be able to identify each wire conductor
of the loudspeaker cables at both ends of the cables. This is relatively easy to do since most loudspeaker cables consist of two
parallel, stranded conductors in a flexible insulation, with a coding system for wire identification. Sometimes there is a colored
"tracer” wrapped around one of the conductors; some cables have one of the conductors colored silver and the other copper;
some have a "ridge” molded on the insulation of one of the conductors, while others are imprinted with a n d / o r m a r k i n g s .
o e o e o
n^t input
ADCOM
10 Timber Lane
Marlbom NJ 07746 USA
Model GFA-5400
Power. 115VAC
Frequency: 50-60Hz
Power ConsumpHon(max): 960W
ADCOM Marque Deposee
/A
'/ '
left input
CAUTION' Tn pmvnnt alaririn .«hof*. Ho not removo coiw Ato
used serviceatile parts inside. Refer servKing to quaUfied
personnel. For continued protection against lire nazard,
replace only with same type and rating fuse Disconnect A C
supply cord befor charing fuse.
WARNING: To reduce the risk of fire or elecinc snock. do not
expose this equipment to rain or moistire
GFA-5400 Rear Panel Diagram
Generally speaking, when making connections to the loudspeakers from the amplifier it is very important to use the
correct type and size of wire in order to avoid unnecessary loss of amplifier power in the cable, reduction of amplifier damping
factor and other undesirable conditions. For runs up to twelve feet, ordinary “zip” or lamp cord, made up of AWG18 stranded
wire and available in a variety of insulation colors may be used. For runs up to forty feet, AWG16 stranded wire should be used
as a minimum to prevent power losses. For lengths over forty feet and not exceeding sixty feet, use at least AWG14 stranded
wire. Runs exceeding sixty feet require the use of heavier conductors such as AWG12.