Assessments - 1, GPA: 3
(
)
)
|
Facilidade de uso
This input type is more common that the balanced XLR input (©) and is designed to work with an unbalanced preamplifier. They will accept standard RCA type plugs, one for each channel, LEFT and RIGHT. The RIGHT input is generally represented by the color red, while LEFT is usually represented by either white or black. To preserve the correct stereophonic effects, please be certain to connect the left output of the preamplifier or tuner-preamplifier to the RCA jack on the GFA-5802 labeled LEFT INPUT and the right output of the source component to the RIGHT INPUT jack To ensure that the performance designed into the GFA-5802 is realized, you should use the highest quality cables feasible. Whatever cable you finally select, it should have low capacitance Generally speaking, a cable with a capacitance of less than 100 pF will work best. BALANCED/UNBLANCED SWITCHES © These switches should “point” towards the input that you are using. If the unbalanced RCA inputs are being used, then the switches should be in the unbalanced position. If you are using the balanced XLR inputs, then the switches should be in the balanced position. It is not suggested to connect both the balanced input to a balanced source and the unbalanced input to an unbalanced source at the same time. RIGHT/LEFT BALANCED (XLR) INPUTS O When you are using a preamp that has balanced outputs (via XLR jacks), it may be directly connected to the GFA-5802 using “balanced XLR" cables. Pushing the release tab on the top of the input will release the XLR NORMAL SPEAKER OUTPUTS O The GFA-5802 is “polarity correct” and does not invert phase. That is, any positive going signal at its input will appear as a positive going signal at its output. The GFA-5802’s connection to the loudspeakers are made through two high quality, five-way, gold plated binding posts located on the rear panel. These terminals will accommodate either bare wire, tinned wire, terminal pins, spade lugs or banana plugs, either single or dual. These output terminals are color coded RED and BLACK to indicate polarity. To ensure correct stereo phasing, you must connect the RED output terminal (labeled “+”) to the loudspeaker input terminal color coded RED (or labeled POSITIVE, “+”, POS, 8 OHMS or 4 OHMS). The BLACK binding post terminal on the amplifier (labeled ”-”) 2 should be connected to the loudspeaker input terminal color coded BLACK (or labeled NEGATIVE, NEG, C, COMMON, G, or GROUND). The RIGHT OUTPUT should be connected to the right channel loudspeaker, as you face the pair of loudspeakers, and the LEFT OUTPUT to the left channel loudspeaker. 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 and other undesirable conditions. It is suggested that with the GFA-5802 you should use at least 14AWG wire and preferably 12AWG. Contact your local Adcom dealer for an appropriate selection of high end cables. Virtually any stereo pair of loudspeakers can be connected to, and driven by the GFA-5802. The amplifier can drive low impedances at more than adequate power levels with no difficulty. It should be noted here that many loudspeaker systems which are nominally rated at 4 ohms drop in impedance, in some parts of their frequency range, sometimes to below 2 ohms. You should not experience difficulties even with these very low impedance loads unless you demand excessively high volume levels from the system. The following diagrams show basic system wiring for two speaker options. BASIC UNBALANCED WIRING DIAGRAM 3 BI-WIRE SPEAKER OUTPUTS O The GFA-5802 incorporates an additional set of output terminals to facilitate bi-wired speaker systems. In a bi-wired system, there are two sets of speaker-wires that connect to each speaker (one for the low frequencies and one for the high frequencies). To be able to bi-wire your speakers, the speakers need to be bi-wirable (having two sets of input terminals, usually with a metal jumper installed between each pair). The following diagram conveys a basic bi-wired system. AC LINE SOCKET O The GFA-5802’sdetachable power cord is supplied with a “grounded" AC plug. Make certain that the power cable is securely plugged into the AC Line Socket on the GFA-5802. 4 FRONT PANEL FEATURES POWER LED This LED will glow whenever the AC ON/OFF switch is turned on and the GFA-5802 is energized. The POWER LED indicates that there is AC voltage being fed to the amplifier, but it does not signify that all the amplifier’s circuits are in operation. If, for example, the THERMAL PROTECTION LED glows, the amplifier will not produce sound even though the POWER LED may still glow. Additionally, the internal power transformer is provided with a thermostat which will interrupt power to the transformer if its temperature exceeds 125eC. This high temperature will seldom,...