Adcom Stereo Amplifier GFP 715 User Manual

GFP-715  
Wide Bandwidth Stereo Preamp  
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TABLE OF CONTENTS  
Welcome . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2  
Table of Contents . . . . . . . . . . . . . . . . . . . . . . 3  
Precautions and Warnings . . . . . . . . . . . . . . . 4  
Introduction & Key Features . . . . . . . . . . . . . 5  
Safety Information . . . . . . . . . . . . . . . . . . . . . 5  
Front Panel Illustration . . . . . . . . . . . . . . . . . 6  
Rear Panel Illustration . . . . . . . . . . . . . . . . . . 6  
Description of Front Panel . . . . . . . . . . . . 6-7  
Description of Rear Panel. . . . . . . . . . . . . . . . 7  
Remote Control Illustration . . . . . . . . . . . . . . 7  
Troubleshooting . . . . . . . . . . . . . . . . . . . . . . 8  
Service Information . . . . . . . . . . . . . . . . . . 8-9  
Warranty . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9  
Your Responsibilites . . . . . . . . . . . . . . . . . . . . 9  
GFP-715 Specifications . . . . . . . . . . . . . . . . 10  
ADCOM GFP-715 Owner’s Manual | 3  
 
THE FOLLOWING PRECAUTIONS AND SAFETY INSTRUCTIONS  
ARE REQUIREMENTS OF UL AND CSA SAFETY REGULATIONS  
Warning: To reduce the risk of fire or electric shock, do  
not expose this unit to rain or moisture.  
ATTENTION  
POUR PREVENIR LES CHOCS ELECTRIQUES NE PAS UTILISER CETTE FICHE  
POLARISEE AVEC UN PROLONGATEUR, UNE PRISE CE COURANT OU UNE  
AUTRE SORTIE CE COURANT, SAUF SI LES LAMES PEUVENT ETRE INSEREES  
A FOND SANS EN LAISSER AUCUNE PARTIE A DECOUVERT.  
CAUTION  
CAUTION  
RISK OF ELECTRIC SHOCK  
DO NOT OPEN  
TO PREVENT ELECTRIC SHOCK DO NOT USE THIS POLARIZED PLUG WITH  
AN EXTENSION CORD, RECEPTACLE OR OTHER OUTLET UNLESS THE  
BLADES CAN BE FULLY INSERTED TO PREVENT BLADE EXPOSURE.  
The graphic symbol of a lightning flash with an  
arrow point within a triangle signifies that there  
is dangerous voltage within the unit and it poses  
a hazard to anyone removing the cover to gain  
access to the interior of the unit. OnIy qualified  
service personnel should make any such attempt.  
CAUTION POWER LINES  
Any outdoor antenna must be located away from all power lines.  
OUTDOOR ANTENNA GROUNDING  
If an outside antenna is connected to your tuner or tuner/preamplifier,  
be sure the antenna system is grounded so as to provide some protection  
against voltage surges and built-up static charges. Section 810 of the  
National Electrical Code, ANSI/NFPA No. 701984, provides information  
with respect to proper grounding of the mast and supporting structure,  
grounding of the lead-in wire to an antenna discharge unit, size of  
grounding conductors, location of antenna discharge unit, connection to  
grounding electrodes, and requirements for the grounding electrode.  
The graphic symbol of an exclamation point within  
an equilateral triangle warns a user of the device  
that it is necessary to refer to the instruction manual  
and its warnings for proper operation of the unit.  
Donotplacethisunitonanunstablecart, stand, tripod,  
bracket, or table. The unit may fall, causing serious  
injury to a child or adult, and serious damage to the  
unit. Use only with a cart, stand, tripod, bracket, or  
table recommended by the manufacturer or sold with  
the unit. Any mounting of the device should follow the  
manufacturer’sinstructions, andshoulduseamounting  
accessory recommended by the manufacturer.  
a. Use No.10 AWG (5.3 mm2) copper, No.8 AWG (8.4 mm2) aluminum, No.17  
AWG (1.0 mm2) copper clad steel or bronze wire, or larger, as a ground wire.  
b. Secure antenna lead-in and ground wires to house with stand-off  
insulators spaced from 46 feet (1.221.83 m) apart.  
Read all the safety and operating instructions before connecting or using  
this unit.  
c. Mount antenna discharge unit as close as possible to where lead-in enters  
house.  
Retain this notice and the owner’s manual for future reference.  
All warnings on the unit and in its operating instructions should be adhered to.  
All operating and use instructions should be followed.  
d. Use jumper wire not smaller than No.6 AWG (13.3 mm2) copper, or the  
equivalent, when a separate antenna grounding electrode is used. See NEC  
Section 810-21 (j).  
EXAMPLE OF ANTENNA GROUNDING AS PER NATIONAL ELECTRICAL CODE  
INSTRUCTIONS CONTAINED INARTICLE 810. RADIOAND TELEVISION EQUIPMENT.  
Do not use this unit near water. For example, near a bathtub, washbowl,  
kitchen sink, laundry tub, in a wet basement, or near a swimming pool.  
power lines  
The unit should be installed so that its location or position does not interfere  
with its proper ventilation. For example, it should not be situated on a  
bed, sofa, rug, or similar surface that may block the ventilation openings;  
or placed in a built-in installation, such as bookcase or cabinet, that may  
impede the flow of air through its ventilation openings.  
ground clamp  
service entrance  
conductors  
standoff  
insulators, b  
The unit should be situated away from heat sources such as radiators, heat  
registers, stoves, or other devices (including amplifiers) that produce heat.  
mast  
The unit should be connected to a power supply outlet only of the voltage  
and frequency marked on its rear panel.  
antenna  
lead-in wire  
service  
The power supply cord should be routed so that it is not likely to be walked  
on or pinched, especially near the plug, convenience receptacles, or where  
the cord exits from the unit.  
entrance  
equipment  
ground wire, a,b  
antenna  
ground clamps  
discharge  
unit, c  
Clean unit only as recommended in its instruction manual.  
to external antenna  
terminals of radio receiver  
The power supply cord of the unit should be unplugged from the wall outlet  
when it is to be unused for a long period of time.  
power service grounding  
electrode system  
(e.g. interior metal water pipe)  
ground wire, a,b  
ground clamps  
Care should be taken so that objects do not fall, and liquids are not spilled,  
into the enclosure through any openings.  
bonding jumper, d  
optional antenna grounding  
electrode driven 8 feet (2.44 M) into  
the earth if required by local codes.  
This unit should be serviced by qualified service personnel when:  
A. The power cord or the plug has been damaged; or  
B. Objects have fallen, or liquid has been spilled, into the unit; or  
C. The unit has been exposed to rain, or liquids of any kind; or  
D. The unit does not appear to operate normally, or exhibits a marked  
change in performance; or  
NOTE TO CATV SYSTEM INSTALLER  
This reminder is provided to call the CATV system installer’s attention to  
Article 82022 of the National Electrical Code that provides guidelines for  
proper grounding and, in particular, specifies that the cable ground shall  
be connected to the grounding system of the building, as close to the  
point of cable entry as practical.  
E. The device has been dropped, or the enclosure damaged.  
DO NOT ATTEMPT SERVICING OF THIS UNIT YOURSELF.  
REFER SERVICING TO QUALIFIED SERVICE PERSONNEL.  
 
carton and all packing material as they The optimal perfomance of your new  
are intended to reduce the possibility GFP-715 will ultimately depend on  
of transportation damage should the the care with which you make the  
preamplifier ever need to be shipped connections between the amplifier,  
again. In the unlikely event damage preamplifier and loudspeakers. All  
has occurred, notify your dealer input and output signal connections  
immediately and request the name of should be made only with high quality,  
the carrier so a written claim to cover low-loss, low capacitance cables. For  
shipping damages can be initiated. The recommendations of the type and  
right to a claim against a public carrier quality of interconnections that are  
can be forfeited if the carrier is not best for your applications, consult with  
notified promptly in writing and if the your ADCOM retailer.  
Introduction  
Congratulations on your decision to  
purchasetheGFP-715stereopreamplifier.  
Two channel audio is better than ever!  
The new DVD Audio and SACD formats  
can support a wider frequency spectrum  
(100kHz) and greater dynamic range  
(144dB) than conventional CD. The GPF-  
715 is designed to capture all the fidelity  
that high resolution audio has to offer,  
with precision broadband components  
and an ultra low noise floor. Equipped  
with a processor loop, a tape loop and  
a phono stage, this new ADCOM preamp  
hasn’t forgotten about your legacy  
components.Audition the GFP-715 paired  
with an ADCOM power amp and DVD  
player and rediscover the magic of two  
channel. To realize the full potential of  
your new stereo preamplifier, and before  
making any connections to it, please  
read these operating and installation  
instructions thoroughly.  
shipping carton and packing materials  
are not available for inspection by  
the carrier. Save all packing materials  
until the claim has been settled.  
Safety Information  
There are no user serviceable parts  
inside. Refer all servicing to qualified  
service personnel.  
Placing the GFP-715  
The unit must be connected to a power  
supply only of the type and voltage  
specified on the rear panel. Connect  
the component to the power outlet  
only with the supplied power supply  
cable or an exact equivalent. Do not  
modify the supplied cable. Do not  
defeat grounding and/or polarization  
provisions. The cable should be  
connected to a 3-pin polarized wall  
outlet, matching the wide blade of the  
plug to the wide slot of the receptacle.  
Do not use extension cords. Do not  
route the power cord where it will  
be crushed, pinched, bent, exposed  
to heat, or damaged in any way. Pay  
particular attention to the power cord  
Although the GFP-715 does not  
generate much heat, it is good practice  
to ensure the amplifier’s long-term,  
trouble-free operation to provide  
adequate ventilation for the unit.  
Therefore, the GFP-715 should be kept  
away from external sources of heat  
such as radiators and hot-air ducts.  
Key Features  
We recommend that you exercise  
care when placing components on top  
of the GFP-715. If you are placing a  
heat producing component (such as an  
amplifier) on top of or below the GFP-  
715, it is recommended that you allow  
at least 3 inches vertical spacing for  
proper airflow.  
• Class A line level preamp  
• high resolution audio bandwidth  
• 4 audio inputs  
• 1 phono input stage  
• tape output w/ monitor function  
• external processor loop  
• bass, treble, and balance adjust  
• front panel headphone input  
• remote control  
If your system includes the use of the at the plug and where it exits the back  
phono input, you may find that placing of the unit. The power cord should be  
components above or under the GFP-715 unplugged from the wall outlet if the  
mayinducehum, causedbytheproximity unit is to be left unused for a long  
of their power transformer to the phono period of time. Immediately stop using  
cables or input jacks. If this should occur, the component and have it inspected  
moving the components will usually help and/or serviced by a qualified service  
Unpacking the GFP-715  
Before your new ADCOM preamplifier  
left our factory, it was carefully  
inspected for physical imperfections  
reduce the hum.  
If you observe these recommendations, • the power supply cord or plug has  
the GFP-715 will perform reliably been damaged;  
in any reasonable environment. You • objects have fallen or liquid has  
should also pay attention to such been spilled into the unit;  
agency if:  
and  
tested  
for  
all  
electrical  
parameters as a routine part of  
ADCOM’s systematic quality control.  
This, along with full operational and  
mechanical testing, should ensure a  
product flawless in both appearance  
and performance. After you have  
unpacked the GTP-715, inspect it for  
physical damage. Save the shipping  
normal considerations as protection • the unit has been exposed to rain;  
from excessive dust and moisture. • the unit shows signs of improper  
Occasional vacuuming of accumulated  
operation; or  
dust on the chassis panels and around • the unit has been dropped or  
the ventilating slots should be all that  
is required.  
damaged in any way.  
ADCOM GFP-715 Owner’s Manual | 5  
 
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[ ]  
[ ]  
4 Bass and Treble Knobs 7 Tone In Button  
Description of Unit:  
Front Panel  
The bass and treble knobs contol the This button is used to engage the bass  
bass and treble frequencies by increasing and treble controls. In the out position,  
or decreasing levels.  
the tone controls will have no effect.  
[ ]  
1 On/Off Power Switch  
The GFP-715 is turned on by pressing  
either the remote control power button  
or toggling the front panel power  
switch. When on, the LED indicator in  
the button will illuminate.  
[ ]  
8 Mono Button  
[ ]  
5 Balance Knob  
The mono setting combines both left  
and right channels for a monaural input  
signal or where speaker placement does  
not accommodate stereo playback.  
Balance control provides adjustment for  
greater accuracy of stereo imaging.  
[ ]  
6 Source Selections  
[ ]  
2 Headphones Jack  
These five buttons select the source you  
desire for listening. When you select  
CD, tuner, phono or video/aux, these  
signals are routed to the tape output  
for recording the selected source. Tape  
playback is accessed by pressing the  
tape button. The presence of signal at  
the tape outputs can be confirmed by  
pressing the tape monitor button. The  
five source select buttons are also on the  
remote control.  
[ ]  
9 Tape Monitor  
Headphonesmaybeusedthroughtheuse  
of the phones output jack on the front  
pael. This jack will accept a standard ꢀ”  
stereo headphone plug.  
Confirms that signals are present at tape  
outputs. If a three-head tape recorder  
is connected, activating this circuit  
will allow direct monitoring from the  
recording. See tape recorder manual for  
details.  
[ ]  
3 IR Sensor  
This lens protects the infrared reciever  
which receives commands from the  
remote control. Note: the pathway  
between the lens and remote control  
must be free of obstruction for the  
remote control to operate the GFP-715.  
[ ]  
10 External Processor  
Selects an exteranl audio precessor, i.e.,  
surround sound processor or equalizer.  
 
connection of an external processor or replace with the identical type and  
an equalizer. Consult the manual of your rating fuse for continued protection. See  
[ ]  
11 Mute Button  
Pressing this button mutes the main  
outputs. To turn the mute feature off,  
press the mute button again. Note:  
turning the volume knob on the front  
panel will not deactivate the mute  
feature.  
external processor.  
Troubleshooting” for more information.  
[ ]  
15 Stereo Outputs  
[ ]  
16 AC Input  
Bypass Output: The signal path from  
this output does not include the tone  
control amplifiers used by the GFP-715.  
In addition, the bypass output is a direct  
coupled connection that bypasses the  
output capacitor present in the main  
signal path.  
Use the provided standard IECAC cord to  
provide power to the unit. The plug is a  
polarized type, for continued electrical  
safety observe proper polariztion at  
main outlet and do not modify plug in  
any way.  
[ ]  
12 Volume Knob  
The front panel volume control knob is  
motorized. It may be adjusted either  
by hand or with the volume buttons on  
the remote control. The volume knob’s  
illuminated LED always indicates the  
volume level.  
Main Output: A line level stereo output  
that connects to the amplifier’s inputs.  
Remote Control  
Thesuppliedremote  
Both outputs can be used at the same  
time to accommodate a second amplifier  
for multi-room operation.  
control,  
here,  
pictured  
duplicates  
CD  
power  
the frequently used  
front panel controls.  
Two AAA batteries  
are included. The  
model number of  
the remote control  
is GFP-710RC.  
Description of Unit:  
Rear Panel  
tuner  
tape  
volume  
[ ]  
16 Infrared Repeaters  
Connect an infrared repeater, such as  
the ADCOM IRA-500II, to control other  
remote controlled components via the  
remote sensor extension.  
video/aux phono  
[ ]  
13 GND Ground Post  
To reduce the chance for hum connect  
the turntable ground lead to this  
attachment point.  
ext. proc mute  
[ ]  
17 Remote Sensor  
Extension Input  
Expand the remote control capabilities  
of the GFP-715 by using an ADCOM XR-  
500II via an external room or zone.  
[ ]  
14 Stereo Inputs  
Connect the various outputs from each  
signal source to these stereo inputs.  
Tape In/Out: Connect the Tape In to  
the Play or Output connection of the  
recording device. Connect Tape Out  
to the Record or Input jacks of the  
recording device.  
[ ]  
18 AC Fuse Holder  
This unit is protected from electrical  
overloads that may be sent to the unit  
from a surge or lighting strike though the  
use of a fuse. If the fuse blows always  
External Processor: The processor  
in/out connectors allow for convenient  
ADCOM GFP-715 Owner’s Manual | 7  
 
SYMPTOM  
POSSIBLE REASON  
POSSIBLE SOLUTION  
Power LED does not  
AC Power Cord(s) not plugged in.  
Plug in AC Power Cord(s).  
glow. No sound  
AC Fuse(s) failed.  
Replace AC Fuse(s).  
Transformer thermal protection engaged.  
I2V DC triggering malfunctioning.  
Wait until unit cools down. It will reset.  
Reset power switch manually. Check  
connection of 12V DC trigger at source.  
Make sure whole system is on.  
Verify all connections on rear of amp.  
Power LED glows,  
but no sound  
Preamp or source unit is not on.  
Connections in rear of amp are loose.  
One channel not  
producing sound  
INPUT(s) or OUTPUT(s) connector  
disconnected or loose.  
Verify both connections on that channel.  
Speaker disconnected.  
Verify connection at speaker.  
Internal protection engaged.  
Bring to Dealer or Service Center.  
If Cable TV is present (see Note 1).  
If Cable TV is not present (see Note 2).  
Try different source (tuner, tape, etc.)  
and/or different RCA cable.  
Hum from all speakers  
at any volume  
Ground loop (difference in ground voltages  
between components).  
Hum from all speakers  
(hum goes up or  
down with volume)  
Hum from the amplifier  
itself  
Problem with source unit (CD, tape, etc.),  
or RCA cable connecting that source unit  
to the preamp.  
Some major appliance, dimmer, halogen or  
fluorescent light is creating interference.  
Make sure all appliances, dimmers and  
suspect lights are off.  
or the first component the cable is connected to (i.e. the  
cable box, or VCR). If the hum is no longer present, you  
must insert a “75Ω ground loop isolator” before reconnect-  
ing the line. You should check with your ADCOM dealer to  
obtain one. If the “75Ω ground loop isolator” works only  
partially or not at all, then please read note 2 to complete  
the troubleshooting procedure.  
Troubleshooting  
Use the troubleshooting notes above to solve common  
situations that don’t require professional attention. If the  
steps stated in possible solution do not resolve your prob-  
lem, then please contact your ADCOM dealer or call the  
ADCOM customer service department. Any problems not  
covered here should be brought to the attention of your  
ADCOM dealer or ADCOM customer service department.  
Note 2: Make sure that the power amplifier is at least 6”  
from processor or other equipment using microprocessors.  
Usually putting another component between them is suf-  
ficient to minimize the hum. If this does not reduce the  
hum, turn the system off and disconnect all Inputs from  
the amplifier. If the hum still persists, then your dealer or  
service center must examine the unit/system. If the hum  
disappears, try another set of RCA cables. Connect one RCA  
cable at a time to see if one specific cable is responsible.  
If any or all cables cause the hum to appear, then the unit  
should be evaluated for proper operation by your dealer or  
authorized service center. Please see our website or call us  
for a list of authorized service centers in your area.  
A special note on “hum:” When there is a low-volume  
“hum” audible throughout your speakers, even with the  
main volume turned all the way down, you have a com-  
mon phenomenon known as a “ground loop.” A ground loop  
is basically a difference in ground voltages between two  
or more components which are connected electrically and  
which creates multiple current paths where there must only  
be one. This difference in potentials creates a 60Hz low-  
level sound (approximately a low A), that seems to “hum.”  
It can be caused by adding new components to your system,  
but that does not imply there is anything electrically wrong  
with any new component. With the advent of audio/video  
and home theater systems, the problem has become com-  
monplace. Generally, the cause is the Cable-TV incoming  
signal line. This new incoming line may add an additional  
ground at a different potential to the AC line ground of  
your other equipment (refer to note I and 2, to trouble-  
shoot a hum problem).  
Servicing  
ADCOM has a technical service department to answer  
questions pertinent to the installation and operation of your  
unit. In the event of difficulty, please contact us for prompt  
advice. If your problem cannot be resolved through our  
combined efforts, we may refer you to an authorized repair  
agency, or authorize return of the unit to our factory. To aid  
us in directing you to a convenient service center, it would  
be helpful if you indicate which major city is accessible to  
your home.  
Note 1: Cable TV systems can sometimes contribute to  
ground loop problems which cause “hum.” To determine  
if your cable system is the contributing factor, disconnect  
the Cable-TV incoming signal line (round, 75Ω) at the wall,  
8 | ADCOM GFP-715 Owner’s Manual  
 
of original purchase from an ADCOM authorized dealer.  
During this period, ADCOM will repair or replace a defective  
product or part, at our option, with a new or refurbished  
product or part without charge to you, as long as you follow  
the procedures listed below.  
Please address mail inquires to:  
ADCOM Service  
8541 East Anderson Drive  
Scottsdale, Arizona 85255 USA  
Phone, Fax or Email inquires to:  
All implied warranties, including implied warranties of  
merchantability and fitness for a particular purpose are  
limited in duration to the duration of the warranty period.  
Voice: (480) 607-2277 or Fax: (480) 348-9876  
Monday through Friday, 8:00 AM to 4:00 PM MST  
This warranty excludes all incidental and consequential  
damages, unless contravened by state law. This warranty  
gives you specific rights and you may have other rights  
which vary from state to state.  
For fax inquires, please include a return fax number for the  
reply. When calling or writing about your ADCOM product,  
be sure to note and refer to its serial number as well as  
the date of purchase and the dealer from whom it was  
purchased. In any communications to us, please include  
a daytime phone number where we may reach you. In  
the event the unit must be returned to our factory for  
service, you will be instructed on the proper procedure  
when you call or write for a return authorization. Under no  
circumstances should your unit be shipped to our factory  
without prior authorization, or packed in other than its  
original carton and fillers.  
No person, agent, distributor, dealer, or company is  
authorized to change, modify or extend the terms of these  
warranties in any manner whatsoever.  
Your Responsibilities  
The above warranties are subject to the following conditions:  
(1) You must retain and present your dated invoice or bill  
of sale to provide proof of original purchase from an ADCOM  
Authorized Dealer and coverage under the warranty period.  
If the original shipping carton and its fillers have been lost,  
discarded, or damaged, a duplicate carton may be obtained  
from our service department for a nominal charge.  
(2) You must notify us within ten (10) days after you  
discover a defective product or part.  
(3) All warranty servicing of this product must be done by  
ADCOM or an authorized ADCOM Service Center.  
Always ship prepaid via United Parcel Service (UPS) or other  
approved carrier. Do not ship via parcel post, since the  
packing was not designed to withstand rough parcel post  
handling. Improper shipment of the product will void your  
warranty coverage.  
(4) This warranty is only valid if this product has been  
purchased and used in the United States. Warranty coverage  
for products purchased and used outside of the United  
States is provided by local ADCOM authorized distributors.  
Warranty  
(5) Charges by third parties for set-up, installation,  
adjustments, shipment, insurance, and other charges are  
not covered by this warranty.  
ADCOM, a division of Klein Technology Group, LLC, makes  
the following limited warranties. These limited warranties  
extend to the original purchaser or any person receiving this  
product as a gift from the original purchaser and to no other  
purchaser or transferee. There is no warranty provided by  
ADCOM for products purchased from unauthorized outlets  
or dealers or from previous owners.  
(6) This warranty extends only to defects in material or  
workmanship as limited above and does not extend to any  
product or part which has been lost or discarded by you, or  
to damage to products or parts caused by misuse, accident,  
Acts of God such as lightning or fluctuations in electrical  
power, improper installation, improper maintenance or use in  
violation of instructions provided in this Owner’s Manual, or to  
products which have been altered or modified. This warranty  
does not extend to products which have had the serial number  
removed, altered, defaced, or rendered illegible.  
LimitedFive Year Warranty (Home, Non-Commercial Use Only)  
ADCOM warrants this product against defects in materials or  
workmanship for a period of five (5) years after the date of  
original retail purchase from an ADCOM authorized dealer.  
During this period, ADCOM will repair or replace a defective  
product or part, at our option, with a new or refurbished  
product or part without charge to you, as long as you follow  
the procedures listed below.  
(7) Physically damaged products are not covered by this  
warranty and will be returned as received without repair.  
Limited Ninety (90) Day Warranty (Commercial Use Only)  
ADCOM warrants this product against defects in materials or  
workmanship for a period of ninety (90) days after the date  
ADCOM GFP-715 Owner’s Manual | 9  
 
GFP-715 Specifications  
Output Impedance  
Bypass/Main Outputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 100 Ohms  
Tape Outputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 475 Ohms  
Output Level  
Bypass / Main Outputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2.0 Vrms  
Output Level (Maximum)  
Bypass / Main Outputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10.0 Vrms  
Frequency Response (±0.5dB)  
High Level . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5Hz-100kHz  
Phono . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5Hz-50KHz  
THD + Noise (@ rated output 20Hz - 20kHz)  
High Level . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.005%  
Phono . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.005%  
Intermodulation Distortion (SMPTE @ rated output)  
High Level . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.005%  
Phono . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.005%  
Signal to Noise (@ rated output - A weighted)  
High Level . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ≥100dB  
Phono . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ≥95dB  
Input Impedance  
High Level . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25KΩ  
Phono . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47kΩ  
Input Sensitivity (@ rated output)  
High Level . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 205 mV  
Phono . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2.4mV  
RIAA accuracy (20Hz - 20kHz)  
Phono . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ± 0.25dB  
Tone Controls  
Bass (20Hz) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ± 11.5dB  
Treble (20kHz) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ± 8.5dB  
General  
Power (available in 230VAC by special order) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 115VAC—50/6OHz  
Chassis Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3” (76.2mm) x 17” (432mm) x 11.5” (292.1mm)  
Maximum Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3.5” (88.9mm) x 17” (432mm) x 12.5” (317.5mm)  
Weight . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 lbs. (5.5kg)  
Weight, Packed . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 lbs. (6.8kg)  
10 | ADCOM GFP-715 Owner’s Manual  
 
Installer’s Notes  
ADCOM GFP-715 Owner’s Manual | 11  
 
ADCOM  
A division of Klein Technology Group, LLC  
8541 East Anderson Drive  
Scottsdale, Arizona 85255  
Voice: (480) 607-2277  
Fax: (480) 348-9876  
GFP715_manual_v1  
 

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