Adcom GFP-345 Manual page 6

To connect the processor, equalizer or surround-sound decoder, etc., to the GFP-345 always use high-quality low-loss
PROCESSOR OUT
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°V^ ***
P[°fSSOI,ab*"ed "'"P*" Hn*n".
or "source- into the EXTERNAL
Ph °UT® k , th®rear pane 0f lhe GFP'345' observing the left and right labelling on both sets of jacks
PRnrpstqnR iw rfihnS,9n.t processor marked "output, "out" or "line-out" to the GFP-345 jacks labelled EXTERNAL
Fp^°"-MeK^hese connections have been effected simply pushing in the EXT PROC © button on the front
panel of the GFP-345 will bring the processor into the circuit.
NOTE
11 n0 processor is plugged into the EXTERNAL PROCESSOR IN © and EXTERNAL
PROCESSOR OUT © jacks, and the EXT PROC © button is pushed in, all the inputs of the GFP-345 will be
disconnected and no output signal will be present at either the OUTPUTS NORM © or the OUTPUTS LAB
® *n£ SOund wil1 be heard throu9h the sys,em- Whenever a signal processor is not being
used, the EXT PROC © button should always be in the out position.
!v^r,r'n° Processor is connected to the EXTERNAL PROCESSOR IN ©and
Kt PRnrLflftR?C.fSS.?R OUT 0 jacks, to use the EXT PROC © button as a mute function. By pressing in the
relMMd ° ® bU* ® S'9 W 66 m,errupted until ,he EXT PROC © button once again, pushed in and
3. Normally, the GFP-345 does not invert polarity; that is, if a positive-going signal is present at any of its inputs,
or^^^8itiVf^Sln9 signal at the ou,puts- However, if a signal processor is connected to the
EXTERNAL PROCESSOR IN © and EXTERNAL PROCESSOR OUT © jacks, and its circuitry inverts polarity
the signals present at the OUTPUTS NORM © and OUTPUTS LAB © will also be inverted in polarity (check
the Instruction Manual of your signal processor to determine if it does or does not invert polarity).
4. Usually, there should be no appreciable level difference whenever a signal processor is connected into or out
of the circuitry of the GFP-345 (through the use of the EXT PROC © button), so long as the processor was
designed with an absolute gam of 1 and adequate input and output impedances to fulfill this function. If a level
difference can be detected when switching a processor in and out of the circuit, and this is disturbing to you
please contact the manufacturer of the processor you are using to see if a correction of this level difference carl
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enectea.
5 It is also possible to employ the EXTERNAL PROCESSOR IN © jacks as an additional set of inputs, since
Sf5£55'apRnt^2S,rl^f«-U,lry* beforejbeLEVEL © and
BALANCE
©
controls. If you wish to use the
S^R N ® ,acks 88 an add,tional lf1Put. simply plug the signal source into the EXTERNAL
PROCESSOR IN ©jacks as you would any of the other inputs (CD ©, TUNER ©. etc.) and select that source
by pushing In the EXT PROC © button. Whatever other selection of sources has been made through the INPUT
p selector wiM be disconnected and the source plugged into the EXTERNAL PROCESSOR IN © jacks will then
be fed through the circuits of the GFP-345 and out of the OUTPUTS NORM © and OUTPUTS LAB ©
5