Adcom GFP-345 - Manual (Page 7)

Whatever processor is connected to the EXTERNAL PROCESSOR IN О and EXTERNAL PROCESSOR OUT 0 jacks
will not be operative at the TAPE OUT 0 jacks. If you wish to insert an equalizer into the tape recorder circuits this must
be done through the specific TAPE IN О and TAPE OUT О jacks along with the particular recorder. In such an instance,
this processor will not operate on any other source selected through the INPUT ® selector but will operate only on the
tape loop to which it has been connected. Similarly, because of the design of the circuitry in the GFP-345, and when the
EXTERNAL PROCESSOR IN
О
jacks are used an additional high-level input, this individual signal will not appear at the
TAPE OUT О jacks, nor can it be selected through the INPUT © selector. Therefore, tape recordings cannot be made
of the signal source plugged into the EXTERNAL PROCESSOR О jacks. To return to usual operation of the preamplifier,
push and release the EXT PROC 0 button and the operation of all the switches and selectors will return to normal and
the source plugged into the EXTERNAL PROCESSOR IN О jacks will be disconnected from the circuitry of the GFP-345.
OUTPUTS NORM ©
The OUTPUTS NORM © are capacitively coupled using very-high-grade metallized film capacitors. It is ideal for use
with power amplifiers which require a bandwith-Mmited signal which does not extend to DC. Although these capacitively-
coupled outputs do restrict, somewhat, the extremely low frequencies, around 5 Hz or 10 Hz, it does not, in any way,
degrade the quality of the signal from the preamplifier. Great care was taken in the selection of capacitors to preclude any
sonic deterioration.
To connect these outputs to your power amplifier, simply interconnect the LEFT CHANNEL and RIGHT CHANNEL
OUTPUTS NORM © jacks to the corresponding left and right input jacks on the amplifier. To preserve the extremely high
quality of the circuitry in the GFP-345, it is recommended that you use as high a quality cable as possible to make this
interconnection.
NOTE
Both the OUTPUTS NORM © and the OUTPUTS LAB © may be used simultaneously should you wish to
bi-amp your speakers, or drive more than one amplifier. When using both of these outputs simultaneously, there
will be no “loading” effects on the preamplifier.
OUTPUTS LAB 0
The OUTPUTS LAB © is direct-coupled, with no capacitors, and was designed to provide an output voltage ideally
matched for operation with the ADCOM brand of amplifiers. It can be used, however, to drive almost any power amplifier
presently available with input sensitivities ranging from below 500mV (0,5V) to well above 2.0V. To connect this output to
your power amplifier, please follow the instructions in the section above OUTPUTS NORM ©.
It should be pointed out that, since the OUTPUT LABS © is direct-coupled, it is an extremely broadband circuit which
responds down to DC (direct current). Therefore, it requires that your power amplifier (if it is not an ADCOM-brand
amplifier) be able to handle this extremely broadband signal.
NOTE
Although the GFP-345 was designed primarily for use with stereo power amplifiers, it can operate just as well with
two mono power amplifiers. When two mono amplifiers are used for stereophonic reproduction, it is strongly
suggested that they be a matched pair with respect to brand, model, input sensitivity and power output.
SWITCHED © OUTLET
The SWITCHED © outlet is controlled by the power switch © on the front panel of the GFP-345. 'ibu may plug the AC
line cord of your power amplifier, or any other accessory, which you want to turn on and off with the power switch © of
the GFP-345 into these outlets. The current-carrying capacity of the switch © Is sufficient to handle the inrush current
of power amplifiers up to the 200-watt-per-channei class. It is not recommended that very-large-power amplifiers, above
the 200-watt class, be plugged into these outlets (see NOTE below following UNSWITCHED © outlet).
UNSWITCHEO © OUTLET
The UNSWITCHED © outlet can supply the AC power requirements of any accessory source used with the GFP-345,
such as a CD player or analog turntable. The ^ line cord of the accessory may be plugged into this outlet. The
UNSWITCHED © outlet is not controlled by the power switch © on the front panel of the GFP-345, and power will
always be available at this outlet so long as the GFP-345 is plugged into an energized wall outlet, regardless of the position
of the main power switch ©. The total power drawn through the UNSWITCHED © outlet must never exceed dcio watts.