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Summary of Contents for Adcom GFA-585se
- Page 1 ADVANCED POWER AMPLIFIER GFA-585se The contents of this manual are subject to change. Please check our website www.adcom.com or www.adcom-usa.com for the most current version. Copyright © 2017 Adcom LLC ...
- Page 2 Basic safety precautions should always be followed when using or exhibits a marked change in performance. your GFA-585SE amplifier, to reduce risk of fire, electric shock, E. The ampli er has been dropped or appears to have and injury to persons: been damaged.
- Page 3 Please read thoroughly these operating instructions for the GFA-585se before connecting or attempting to operate it. The installation and operation of the GFA-585se are described in the following pages. We sincerely hope you will value and enjoy the considerable attention we have given its design and construction.
- Page 4 To achieve the above, 14 pairs of specially selected TO-3-type, metal-cased bipolar output transistors are used in the GFA-585se in a triple-Darlington configuration of its driver and output stages. The safe operating area of these transistors, along with their circuit topology, insures very efficient power delivery to reactive loads, regardless of the phase angle of voltage and current.
- Page 5 If any number is altered or missing, you should notify us immediately in order to insure that you have received a genuine ADCOM product which has not been opened, mishandled or tampered with in any way.
- Page 6 GFA-585se, but the free flow of air through the ventilating slots provided in the chassis of the amplifier may be partially obstructed. If you require that the GFA-585se be...
- Page 7 To preserve the correct stereophonic effects, please be certain to connect the left output of the preamplifier to the RCA jack on the GFA-585se labeled LEFT INPUT and the right output of the preamplifier section to the RCA jack labeled RIGHT INPUT.
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Page 8: Stereo/Bridged Mono Input/Output
DC 12V 100mA 3.5ᶲ output jack for trigger other devices NOTE The GFA-585se is polarity correct; that is, it does not invert "phase". Any positive-going signal at its inputs will appear as a positive-going signal at its outputs. The RIGHT STEREO OUTPUT should be connected to the right-channel loudspeaker, as you face the pair of loudspeakers, and the LEFT STEREO OUTPUT to the left-channel loudspeaker. - Page 9 Generally speaking, when making connections to the loudspeakers from the amplifier, it is very important to use the correct type and size of wire in order to avoid unnecessary loss of amplifier power in the cable, reduction of amplifier damping factor (DF) and other undesirable conditions.
- Page 10 All loudspeaker systems having a nominal impedance down to 2 ohms can be connected to, and driven by the GFA-585se. The GFA-585se can drive these low impedances at more than adequate power levels with no difficulty. It should be noted here that many loudspeaker systems which are rated, nominally, at 4 ohms drop in impedance.
- Page 11 INPUT jack should be removed since the right-channel input portion of the amplifier is inoperative. Only a single loudspeaker is to be connected to the GFA-585se when in the bridged mono mode. Please note that connections made to the loudspeaker from the GFA-585se, when used in the bridged mono mode, are different from those made when the amplifier is used in the stereo mode.
- Page 12 (or labeled NEG, "-", C, COM, COMMON, G, or GROUND). Although the GFA-585se can generate a substantially greater amount of power in the bridged mono mode than when it is in its normal stereo mode, it requires the use of loudspeakers the nominal impedance of which does not drop below 4 ohms.
- Page 13 The GFA-585se has a massive power supply which remains charged for up to 12 MINUTES after the amplifier is turned off and the POWER LED ceases to glow. It also remains energized when the POWER.
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Page 14: Ac Line Cord
The AC LINE FUSE protects the electronic circuits of the GFA-585se. This fuse, normally, will blow only if there is an overload within the GFA-585se. Since this fuse has been designed to protect the electronic circuits in the GFA-585se, it is recommended that it be replaced only with one of the fuses listed in the table below. -
Page 15: Ac Line Fuses
The AC ON/OFF switch controls power to the power transformer and circuits of the GFA- 585se. Whenever the GFA-585se is energized, the POWER LED will glow. Push the top of the rocker switch to energize the GFA-585se. Push the bottom of the rocker switch to turn the unit off. -
Page 16: Power Led
POWER LED This LED will glow whenever the AC ON/OFF switch is turned on and the GFA-585se is energized. If the AC LINE FUSE blows, the POWER LED will cease to glow. Firstly please check the “power mode switch” on the rear panel – Manual, Auto on, Trigger positions. - Page 17 THERMAL PROTECTION LED The GFA-585se is provided with a thermal protection circuit which will shut down the amplifier if the temperature of either heatsinks reaches 70°C. The THERMAL PROTECTION LED will light whenever the thermal protection circuit on either channel, or both channels, has been triggered and the amplifier is inoperative.
- Page 18 EXTREME CASES, UNDERTAKE ALL THREE. CARING FOR YOUR GFA-585se Great care has been taken by ADCOM to assure that your amplifier is as flawless in appearance as it is electronically. The front panel is a heavy- gauge, high-grade aluminum extrusion carefully finished and anodized for durability. The chassis, top cover and rear panel are of heavy-gauge steel, both painted and baked.
- Page 19 U.S.A. email: info@adcom-usa.com When calling or writing about your GFA-585se, be sure to note and refer to its model and serial numbers as well as the date of purchase and the ADCOM authorized dealer from whom it was purchased. In the event the unit must be returned for service, you will be instructed as to the proper procedure when you call or write.
- Page 20 GFA-585se SPECIFICATIONS Power Rating (To FTC Requirements) 450 watts continuous average power into 8 ohms at any frequency between 20Hz and 20kHz with both channels driven at less than 0.05% THD. 600 watts continuous average power into 4 ohms at any frequency between 20Hz and 20kHz with both channels driven at less than 0.07% THD.·...
- Page 21 THD + Noise at 1000 Watts into 8 Ohms, Bridged 20Hz 0.05% 1kHz 0.01% 10kHz 0.10% 20kHz 0.15% Frequency Response @ 1 Watt into 8 Ohms (-3dB) 10Hz to 140kHz Power Bandwidth (0.25dB) 20Hz to 20kHz Dynamic Headroom into 4 Ohms 1.10dB Signal-to-Noise Ratio, "A"...
- Page 22 No part of this manual may be reproduced or electronically transmitted without the express written consent of Adcom LLC. Adcom LLC shale not be liable for any errors contained herein or for any damages arising out of or related to this document or the information contained herein, even if Adcom LLC has been advised of the possibility of such damages.
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