Adcom GFP-345 User Manual

Whatever processor is connected to the EXTERNAL PROCESSOR IN O and EXTERNAL PROCESSOR OUT O jacks
ro'Tnhfh! i acks - l f V ou wj sh to insert an equalizer into the tape recorder circuits this must
be done through the specific TAPE IN © and TAPE OUT © 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
FXTFRNAI °pinr^nSl^n n n T te(i ' simi,arly ' because of the design of the circuitry in the GFP-345. and when the
TA QC , S S0R IN ® )acks are used an additional high-level input, this individual signal will not appear at the
TAPE OUT © jacks, nor can it be selected through the INPUT © selector Therefore, tape recordings cannot be made
of the signa source Pegged into the EXTERNAL PROCESSOR © jacks. To return to usual operation of the preamplifier
push and release the EXT PROC © button and the operation of all the switches and selectors will return to normal and
the source plugged into the EXTERNAL PROCESSOR IN © 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-limited signal which does not extend to DC. Although these capacitivelv-
coupled outputs do restrict, somewhat, the extremely low frequencies, around 5 Hz or 10 Hz, it does not, in any way
sonic detedoration ° f ^ S ' 9nal fr ° m ,he preampli,ier Great care was taken in the selection of capacitors to preclude any
™ £ tpUtS ,0 V ° Ur POWer arnplifier ' sim P'y 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 hiqh
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. y
OUTPUTS LAB ©
Tha ? U J« PUTS L ^ B ® . ,s direct-coupled, with no capacitors, and was designed to provide an output voltaqe ideally
ma c ed for operation with the ADCOM brand of amplifiers. !t 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
l ™ uwii° W h| t0 . D ? (d J[’ e ?’ C Urren,) ' There,ore ' '* 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
wo 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. You 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
°J P ? ™ er am P |lfiers up to the 200-watt-per-channel 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).
UNSWITCHED © OUTLET
The UNSWITCHED © outlet can supply the AC power requirements of any accessory source used with the GFP-345,
f^ a S r a ? P P ^ yer anal °9 The AC 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 mam power switch ©. The total power drawn through the UNSWITCHED © outlet must never exceed 800 watts.
6

Adcom GFP-345 Specifications

General

Brand	Adcom
Model	GFP-345
Category	Amplifier
Language	English