8
with copper wire and which increase its contact resistance. It is partly for this reason that
double or single banana plugs are preferred. However, make sure that the cable ends are
tinned before you make the cable connections to the banana plugs. Alternatively, you can
use "crimped" pins or other lugs to insure lowest contact resistance at the connection to the
amplifier and loudspeakers.
If you prefer to use other methods of connection, unscrew the insulated, round head of the
binding post until the hole in the binding-post stud is accessible. You can then insert the bare
or tinned wire, or terminal pin, through the hole. You can also use the many varieties of spade
lugs available by simply placing the tines of the spade lug onto the binding post stud. Turn
the insulated round head of the binding post clockwise until the wire or connector is firmly
secured. Finger pressure is sufficient and you should not use pliers, or other tools, which
could damage or over-tighten the binding post assembly. The binding post has been
designed in such a way that finger pressure is all that is needed to cause a "pinching" action
among the different metal surfaces to insure proper connection.
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.
In most applications, you can drive two or more sets of loudspeakers. You should note,
however, that when loudspeakers are paralleled, the impedance presented to the amplifier is
lower than the nominal impedance of each loudspeaker. In other words, if you parallel two 8-
ohm sets of loudspeakers, the resultant impedance will be 4 ohms. If you parallel two sets of
4-ohm-impedance loudspeakers, the resultant impedance of the load will be 2 ohms. If 8-
ohm and 4-ohm loudspeakers are paralleled, the resultant impedance will be about 2.6 ohms.
In these last two situations, and depending on the lowest impedance of the nominally-4-ohm
speakers, and when making excessive power demands from the amplifier, you may trigger
the THERMAL PROTECTION on the amplifier or blow one of the AC RAIL FUSES. See their
respective sections for more information. In those very rare instances in which your particular
application causes frequent activation of the THERMAL PROTECTION e circuitry, you might
consider use of an auxiliary fan to increase amplifier cooling. Alternatively, and for convenient
switching of multiple sets of speakers with impedance protection for the amplifier, you may
consider the use of an ADCOM speaker selector. These are available from your ADCOM
dealer.
