Adcom Home Theater System GFP 815 User Manual

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ABOUT ADCOM  
PERFORMANCE AND VALUE  
In the world of high performance electronics, Adcom has done the impossible: make state of the  
art components that are easy to use at an affordable price. In doing this, Adcom has created a  
revolution in the world of consumer electronics. By creating some of the most renowned com-  
ponents and offering them at affordable prices, Adcom has enabled more people to enjoy their  
favorite music and movies at top performance levels. Perhaps Audio Magazine said it best: “No  
competing company I know can provide a similar balance of sound quality, power and afford-  
ability.”  
AWARD WINNING  
Innovation is our stronghold, and our numerous awards year after year prove that we’re never  
satisfied to rest on our reputation. From our legendary high current amplifiers to our state-of-  
the art digital processors, Adcom components consistently impress even the most demanding  
audiences. Adcom components have won over 25 Product of the Year and Special Recognition  
citations from Audio Video International, 3 Diapason D’Or Awards, 7 Consumer Electronics Show  
Design and Engineering Awards, and have appeared on Stereophile’s “Recommended Compo-  
nents” lists over 70 times since 1988. A reputation worth its weight in gold.  
ENGINEERING PASSION  
Every Adcom component is not only designed to reproduce the highest quality sound and pic-  
ture, but to also deliver the greatest possible value. It is our engineers’ passion for perfection  
that has enabled our components to be judged the equivalent of others costing two, three, or  
even five times as much. Our engineering team consistently strives to develop and design prod-  
ucts that will exceed your expectations. Our goal at Adcom is to let more consumers hear high-  
end quality sound and see high-end video without paying high-end prices.  
All Adcom components are the result of a long-standing dedication to innovation, quality, sim-  
plicity and value. Adcom, we have the power, and now so do you.  
This document is subject to change. Please check our website for  
the most up-to-date version.  
REV 2.1, 4/2011  
ADCOM is a registered trademark of ADCOM LLC  
Copyright © 2011 ADCOM LLC. All rights reserved. No part of this manual may be reproduced or  
electronically transmitted without the express written consent of ADCOM LLC.  
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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 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.  
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 re-  
quirements for the grounding electrode.  
injury to a child or adult, and serious damage to the unit.  
Use only with a cart, stand, tripod, bracket, or table rec-  
ommended by the manufacturer or sold with the unit. Any  
mounting of the device should follow the manufacturer’s  
instructions, and should use a mounting accessory recom-  
mended by the manufacturer.  
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.  
Secure antenna lead-in and ground wires to house with stand-off insula-  
tors spaced from 46 feet (1.221.83 m) apart.  
Mount antenna discharge unit as close as possible to where lead-in enters  
house.  
Read all the safety and operating instructions before connecting or using  
this unit.  
Retain this notice and the owner’s manual for future reference.  
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).  
All warnings on the unit and in its operating instructions should be  
adhered to.  
All operating and use instructions should be followed.  
EXAMPLE OF ANTENNA GROUNDING AS PER NATIONAL ELECTRICAL CODE  
INSTRUCTIONS CONTAINED IN ARTICLE 810. RADIO AND 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.  
The unit should be installed so that its location or position does not inter-  
fere with its proper ventilation. For example, it should not be situated on  
a bed, sofa, rug, or similar surface that may block the ventilation open-  
ings; or placed in a built-in installation, such as bookcase or cabinet, that  
may impede the flow of air through its ventilation openings.  
The unit should be situated away from heat sources such as radiators, heat  
registers, stoves, or other devices (including amplifiers) that produce  
heat.  
The unit should be connected to a power supply outlet only of the voltage  
and frequency marked on its rear panel.  
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.  
Clean unit only as recommended in its instruction manual.  
The power supply cord of the unit should be unplugged from the wall out-  
let when it is to be unused for a long period of time.  
Care should be taken so that objects do not fall, and liquids are not  
spilled, into the enclosure through any openings.  
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 Electri-  
cal Code that provides guidelines for proper grounding and, in particular,  
specifies that the cable ground shall be connected to the grounding sys-  
tem 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.  
-
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The optimal performance of your new  
GFP-815 will ultimately depend on the  
care with which you make the connec-  
tions between the amplifier, pream-  
plifier and loudspeakers. All input and  
output signal connections should be  
made only with high quality, low-loss,  
low capacitance cables. For recom-  
mendations of the type and quality of  
interconnections that are best for  
your applications, consult with your  
ADCOM retailer.  
In the unlikely event damage has oc-  
curred, notify your dealer immediate-  
ly and request the name of the carrier  
so a written claim to cover shipping  
damages can be initiated. The right to  
a claim against a public carrier can be  
forfeited if the carrier is not notified  
promptly in writing and if the shipping  
carton and packing materials are not  
available for inspection by the carrier.  
Save all packing materials until the  
claim has been settled.  
Introduction  
Congratulations on your decision to  
purchase the GFP-815 stereo preamp-  
lifier. Two channel audio is better  
than ever! The new DVD Audio and  
SACD formats can support a wider fre-  
quency spectrum (100kHz) and great-  
er dynamic range (144dB) than con-  
ventional CD. The GPF-815 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 phono stage, this new ADCOM  
preamp hasn’t forgotten about your  
legacy components. Audition the GFP-  
815 paired with an ADCOM power amp  
and CD / 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.  
Placing the GFP-815  
Safety Information  
There are no user serviceable parts  
inside. Refer all servicing to qualified  
service personnel.  
Although the GFP-815 does not gen-  
erate much heat, it is good practice to  
ensure the amplifier’s long-term,  
trouble-free operation to provide ad-  
equate ventilation for the unit. There-  
fore, the GFP-815 should be kept  
away from external sources of heat  
The unit must be connected to a pow-  
er 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 de-  
feat grounding and/or polarization  
provisions. The cable should be con-  
nected to a 3-pin polarized wall out-  
let, matching the wide blade of the  
plug to the wide slot of the recepta-  
cle. 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  
at the plug and where it exits the  
back of the unit. The power cord  
should be unplugged from the wall  
outlet if the unit is to be left unused  
for a long period of time. Immediately  
stop using the component and have it  
inspected and/or serviced by a quali-  
fied service agency if:  
such as radiators and hot-air ducts.  
We recommend that you exercise care  
when placing components on top of  
the GFP-815. If you are placing a heat  
producing component (such as an am-  
plifier) on top of or below the GFP-  
815, it is recommended that you allow  
at least 3 inches vertical spacing for  
proper airflow.  
Key Features  
Class A line level preamp  
High resolution audio bandwidth  
7 source audio inputs  
2 mp3 input front and rear panel  
Phono input stage (MM & MC)  
Main & Record outputs  
External remote in and loop  
Bass, treble, and balance adjust  
Front panel headphone input  
Remote control and rs-232 control  
If your system includes the use of the  
phono input, you may find that pla-  
cing components above or under the  
GFP-815 may induce hum, caused by  
the proximity of their power trans-  
former to the phono cables or input  
jacks. If this should occur, moving the  
components will usually help reduce  
the hum.  
Unpacking the GFP-815  
Before your new ADCOM preamplifier  
left our factory, it was carefully in-  
spected for physical imperfections  
and tested for all electrical parame-  
ters as a routine part of ADCOM’s sys-  
tematic quality control. This, along  
with full operational and mechanical  
testing, should ensure a product flaw-  
less in both appearance and perfor-  
mance. After you have unpacked the  
GTP-815, inspect it for physical dam-  
age. Save the shipping carton and all  
packing material as they are intended  
to reduce the possibility of transpor-  
tation damage should the preamplifier  
ever need to be shipped again.  
If you observe these recommendations  
the GFP-815 will perform reliably in  
any reasonable environment.  
. The power supply cord or plug has been  
damaged;  
. Objects have fallen on or liquid has  
been spilled into the unit;  
. The unit has been exposed to rain;  
. The unit shows signs of improper  
operation; or  
You should also pay attention to such  
normal considerations as protection  
from excessive dust and moisture.  
Dust on the surface of the cabinet can  
be easily and safely removed with a  
duster such as made by Swiffer™. Fin-  
ger prints can be removed with a soft  
cloth dampened with a mild non-  
ammonia cleaner.  
. The unit has been dropped or damaged  
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Description of Unit: Front Panel  
[4-7] Source Selections  
[1] Standby button  
[10] Bass & Treble Knobs  
Toggles the GFP-815 in and out of  
Standby mode. When in standby  
mode, the GFP-815 is activated by  
pressing either the remote control  
power button or toggling the front  
panel power switch. When the GFR-  
815 is active, the LED indicator in the  
Standby button will illuminate.  
The bass and treble knobs control the  
bass and treble frequencies by in-  
creasing or decreasing levels.  
These seven buttons select the source  
you desire for listening. When you se-  
lect phono(1), 2, 3, 4, 5, 6 or mp3(7),  
the selected source is also routed to  
the record outputs. The seven source  
select buttons are also available on  
the remote control.  
[11] Balance Knob  
Balance control provides adjustment  
for greater accuracy of stereo imag-  
ing.  
[8] Tone Button  
[2] IR Sensor  
This button is used to engage the bass  
and treble controls. In the out posi-  
tion, the tone controls will have no  
effect.  
[12] Mute Button  
This lens protects the infrared receiv-  
er which receives commands from the  
remote control. Note: the pathway  
between the lens and remote control  
must be free of obstruction for the re-  
mote control to operate the GFP-815.  
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.  
[9] MP3 IN Jacks  
Mp3 devices can be connected to the  
mp3 input jack on the front pan-  
el(3.5mm) or the mp3 RCA jacks on  
the back panel.  
[3] Headphones Jack  
Headphones may be used through the  
use of the phones output jack on the  
front panel. This jack will accept a  
standard 1⁄4” stereo headphone plug.  
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[13] Volume Knob  
[18] Ext Remote  
A remote infrared sensor can be con-  
nected here.  
Voltage switch (Bottom)  
Sets the GFP-815 voltage to 120V  
(U.S. standard) or 230V (interna-  
tional standard).  
The front panel volume control knob  
is motorized. It may be adjusted ei-  
ther by hand or with the volume but-  
tons on the remote control. The point  
dot on the volume knob indicates the  
volume level.  
Main power switch  
Switches the GFP-815’s main pow-  
er on and off.  
Description of Unit:  
Rear Panel  
[19] Auto turn on  
Remote Control  
The supplied remote control, pictured  
here, duplicates the frequently used  
front panel controls. Two AAA bat-  
teries are included. The model num-  
ber of the remote control is RC815.  
A trigger, if properly hooked-up, can  
prove to be very convenient.  
[14] GND Ground Post  
To reduce the chance for hum connect  
the turntable ground lead to this at-  
tachment point.  
-in input jack use the 12V DC or AC  
trigger in conjunction with another  
device to turn the GFR-815 on and  
off. The trigger output from the oth-  
er device should go to the trigger  
input on the rear panel of the GFP-  
815.  
[15] Source Inputs  
Source 1~7 inputs (R/L) Connects to  
the line outputs of a CD player or  
other analog audio source compo-  
nent. Up to seven analog audio  
source devices can be connected.  
-loop output jack is provided to  
allow trigger control of additional  
components in your system.  
[16] Stereo Outputs  
Rec Output: Connect rec output to  
the Record or Input jacks of a record-  
ing device.  
Main Output: A line level stereo out-  
put that connects to your amplifier’s  
inputs.  
[20] AC Input  
Connects the GFP-815 to a standard  
electrical outlet using the supplied  
power cord. Use the provided stand-  
ard IEC AC cord to provide power to  
the unit. The plug is a polarized type.  
for electrical safety, observe proper  
polarization at main outlet and do not  
modify plug in any way. If it is ever  
necessary, replace the fuse with a  
fuse of identical type and rating for  
continued protection. See “Trouble-  
shooting” for more information.  
[17] RS232 Control  
The Adcom GFP-815 can be con-  
trolled via the serial RS-232 port.  
The serial port can be connected to  
a system controller, PC or ‘dumb  
terminal’ via a straight through  
standard 9-pin(DB9) serial port cable  
(MALE on one end and FEMALE on the  
other end).  
Input 1 select  
Sets the input level for input  
source 1 to mm or mc for phono  
cartridge input or line for other  
analog devices.  
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SYMPTOM  
POSSIBLE REASON  
POSSIBLE SOLUTION  
Power LED does not  
glow. No sound  
AC Power Cord(s) not plugged in. AC  
Fuse(s) failed. Transformer thermal protec- Fuse(s). Wait until unit cools down. It will  
tion engaged. I2V DC triggering malfunc-  
tioning.  
Plug in AC Power Cord(s). Replace AC  
reset. Reset power switch manually.  
Check connection of 12V DC trigger at  
source.  
Power LED glows, but no Preamp or source unit is not on. Connec-  
sound tions in rear of amp are loose.  
Make sure whole system is on. Verify all  
connections on rear of amp.  
One channel not produc- INPUT(s) or OUTPUT(s) connector discon-  
Verify both connections on that channel.  
Verify connection at speaker. Bring to  
Dealer or Service Center.  
ing sound  
nected or loose. Speaker disconnected.  
Internal protection engaged.  
Hum from all speakers  
at any volume  
Ground loop (difference in ground voltages  
between components).  
If Cable TV is present (see Note 1). If Ca-  
ble TV is not present (see Note 2).  
Hum from all speakers  
(hum goes up or down  
with volume)  
Problem with source unit (CD, tape, etc.),  
or RCA cable connecting that source unit to and/or different RCA cable.  
the preamp.  
Try different source (tuner, tape, etc.)  
Hum from the amplifier  
itself  
Some major appliance, dimmer, halogen or Make sure all appliances, dimmers and  
fluorescent light is creating interference.  
suspect lights are off.  
Troubleshooting  
Use the troubleshooting notes above to solve common sit-  
uations 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.  
Cable-TV incoming signal line (round, 75Ω) at the wall,  
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 recon-  
necting the line. You should check with your ADCOM deal-  
er 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.  
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 common  
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 be  
a “hum.”  
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 respon-  
sible. 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  
for a list of authorized service centers in your area.  
Hum can be caused by adding new components to your  
system, but that does not imply there is anything electri-  
cally wrong with any new component. With the advent of  
audio/video and home theater systems, the problem has  
become commonplace. 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 troubleshoot 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  
advice. If your problem cannot be resolved through our  
combined efforts, we may refer you to an authorized re-  
pair agency, or authorize return of the unit to our factory.  
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  
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ADCOM LLC  
PO Box 54087  
Phoenix, AZ 85032  
Limited Two Year Warranty  
(Home, Non-Commercial Use Only)  
Phone, Fax or Email inquiries to:  
Voice: (480) 607-2277  
Fax: (623) 505-9523  
Monday through Friday, 9:00 AM to 5:00 PM MST  
Briefly, ADCOM warrants this product against defects in  
materials or workmanship for a period of two (2) 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. Consult the warranty document enclosed with the  
product or our website for the complete terms and condi-  
tions of the warranty.  
For fax inquiries, 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 in-  
clude a daytime phone number where we may reach you.  
In the event the unit needs to be sent to a service center,  
you will be instructed on the proper procedure when you  
call or write for a return authorization. Under no circum-  
stances should your unit be shipped to our factory with-  
out prior authorization, or packed in other than its orig-  
inal carton and fillers.  
Limited Ninety (90) Day Warranty  
(Commercial Use Only)  
Briefly, ADCOM warrants this product against defects in  
materials or workmanship for a period of ninety (90) days  
after the date of original retail purchase from an ADCOM  
authorized dealer. Consult the warranty document en-  
closed with the product or our website for the complete  
terms and conditions of the warranty.  
No person, agent, distributor, dealer, or company is au-  
thorized to change, modify or extend the terms of ADCOM  
warranties in any manner whatsoever.  
Always ship prepaid via FEDEX or UPS. Do not ship via Par-  
cel Post, since the packing was not designed to withstand  
rough Parcel Post handling. Improper packaging and ship-  
ment of the product will void your warranty coverage.  
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 during the warran-  
ty period.  
Warranty – USA & Canada  
This warranty is only valid if this product was purchased  
and used in the United States or Canada. Warranty cover-  
age for products purchased and/or used outside of the  
United States and/or Canada is provided by local ADCOM  
authorized dealers and distributors in the country where  
the product was sold. Consult your local dealer or distribu-  
tor about the terms of your warranty.  
(2) All warranty servicing of this product must be done by  
an authorized ADCOM Service Center.  
(3) Charges by third parties for set-up, installation, de-  
installation, adjustments, shipment, insurance, and other  
charges are not covered by this warranty.  
ADCOM LLC, makes the following limited warranties. The-  
se limited warranties extend to the original purchaser or  
any person receiving this product as a gift from the origi-  
nal purchaser and to no other purchaser or transferee.  
There is no warranty provided by ADCOM for products  
purchased from unauthorized sellers, dealers or from  
previous owners.  
(4) 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, acci-  
dent, pets, Acts of God such as lightning or fluctuations in  
electrical power, improper installation, improper mainte-  
nance 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, de-  
faced, or rendered illegible.  
(5) Physical damage to the product from any cause is not  
covered by this warranty and the product will be returned  
as received without repair.  
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GFP-815 Specifications  
Output Level  
Main Outputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  
1.2 Vrms  
Rec Outputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 282mVrms  
L/R Output Difference  
Main Outputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  
0.1dB  
Output Level (Maximum)  
THD at 0.1% Main Outputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9.0 Vrms  
Frequency Response (-3dB Line volume at max)  
High Level . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10Hz-100kHz  
Phono . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 Hz-80KHz  
THD + Noise (@ rated output 20Hz - 20kHz)  
High Level . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.005%  
MM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . 0.03%  
MC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.15%  
Signal to Noise (80K Filter JIS-A  
High Level . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ≥98dB  
MM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ≥64dB  
MC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ≥55dB  
Input Impedance  
Line . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 130KΩ  
Line 2-6 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  
31KΩ  
MP3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31KΩ  
MM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30KΩ  
Input Sensitivity (@ rated output)  
Line 1-6 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 300mV  
MP3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75mV  
MM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3.2mV  
MC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.5mV  
RIAA accuracy (20Hz - 20kHz)  
Phono . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ± 0.5dB  
Tone Controls  
Bass (100Hz) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ± 8dB  
Treble (10kHz) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ± 9dB  
General  
Power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 120VAC- 230VAC —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)  
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GFP-815 Serial Port  
Command Set  
INTRODUCTION  
The Adcom GFP-815 can be controlled via the serial RS-232 port. The serial port can be connected to a sys-  
tem controller, PC or ‘dumb terminal’ via a straight-through standard 9-pin serial port cable (MALE on one end  
and FEMALE on the other end). When using a PC, a terminal emulator program (e.g. HyperTerminal or Pro-  
Comm), can be used to control the GFP-815.  
The communications parameters should be set as follows:  
9600 baud, 8 data bits, no parity, 1 stop bit and Flow Control: Hardware  
GFP-815 COMMAND SET  
COMMAND String Hexadecimal String ASCII  
POWER ON 57,20,31,20,31,20,32<CR> W 1 1 2<CR>  
POWER OFF 57,20,31,20,31,20,31<CR> W 1 1 1<CR>  
POWER TOGGLE 57,20,31,20,31,20,33<CR> W 1 1 3<CR>  
VOLUME UP 57,20,31,20,39,20,31<CR> W 1 9 1<CR>  
VOLUME DOWN 57,20,31,20,39,20,32<CR> W 1 9 2<CR>  
MUTE ON 57,20,31,20,31,30,20,32<CR> W 1 10 2<CR>  
MUTE OFF 57,20,31,20,31,30,20,31<CR> W 1 10 1<CR>  
MUTE TOGGLE 57,20,31,20,31,30,20,33<CR> W 1 10 3<CR>  
POLARITY NORMAL (0) 57,20,31,20,32,20,31,33<CR> W 1 2 13<CR>  
POLARITY INVERT (180) 57,20,31,20,32,20,31,34<CR> W 1 2 14<CR>  
POLARITY TOGGLE 57,20,31,20,32,20,31,35<CR> W 1 2 15<CR>  
TRIGER ON 57,20,31,20,33,20,31<CR> W 1 3 1<CR>  
TRIGER OFF 57,20,31,20,33,20,32<CR> W 1 3 2<CR>  
PHONO (INPUT 1) 57,20,31,20,32,20,36<CR> W 1 2 6<CR>  
INPUT 2 57,20,31,20,32,20,37<CR> W 1 2 7<CR>  
INPUT 3 57,20,31,20,32,20,38<CR> W 1 2 8<CR>  
INPUT 4 57,20,31,20,32,20,38<CR> W 1 2 9<CR>  
INPUT 5 57,20,31,20,32,20,31,30<CR> W 1 2 10<CR>  
INPUT 6 57,20,31,20,32,20,31,31<CR> W 1 2 11<CR>  
MP3 (INPUT 7) 57,20,31,20,32,20,31,32<CR> W 1 2 12<CR>  
NEXT INPUT 57,20,31,20,32,20,34<CR> W 1 2 4<CR>  
PREVIOUS INPUT 57,20,31,20,32,20,35<CR> W 1 2 5<CR>  
TONE ON 57,20,31,20,34,20,31<CR> W 1 4 1<CR>  
TONE OFF 57,20,31,20,34,20,32<CR> W 1 4 2<CR>  
Please Note: ‘’<CR>’’ stands for Carriage Return, the Hex Code is ‘’0D’’. A  
space in Hex is ’’20’’, a space in ASCII is just a blank space (as shown above).  
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ADCOM llc  
PO Box 54087  
Phoenix, AZ 85078  
PH: (480) 607-2277  
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