Peavey GPS 1500, Operation Manual

Page: 11 / 68

11
N NO OT TE E:: Regardless of operating mode, N NE EV VE ER R connect amplifier outputs together!
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Speakers are connected using the output connectors on the rear of your amplifier. Make sure the amplifier
is turned off before you change any output connections. Refer to the diagram on page 14 to view the wiring
configuration of the Speakon connectors if your model utilizes them. Consult the Wire Gauge Chart on page
14 to find a suitable wire gauge and minimize losses of power in the speaker cables. Also, make sure that
the load impedance is not lower than that rated for the amplifier.
P Prro otte eccttiio on n FFe ea attu urre ess
The GPS Series incorporates protection features derived from Peavey’s extensive experience with reliability.
The amplifiers are ruggedly built from high quality components and feature comprehensive protection cir-
cuits to protect your amplifier from those “real world” occurrences.
D DD DT T
At the amplifier’s full power, or clipping point, the channel gain will automatically be reduced, guarding the
loudspeakers against damaging high power and continuous square waves that would otherwise be pro-
duced. This is indicated by illumination of the DDT LED. Operation is virtually transparent in use and full
signal bandwidth is maintained. However, if you have a GPS 900 or 1500 and choose to defeat the DDT
compression function, this will not apply and clipping may occur.
LLo oa ad d FFa au ulltt C Co orrrre eccttiio on n ™ ™
LFC
™
(Load Fault Correction
™
) is an innovative circuit that will instantaneously reduce channel gain to allow
the amplifier to operate at a safe level into an abnormal load. Moderate activation of LFC is inaudible in
normal use. In addition, if extreme low impedance or a short circuit is encountered during high signal level
conditions, the amplifier’s output relay will open.
IIn niittiia alliizza attiio on n P Prro otte eccttiio on n
™ ™
((IIP P
™ ™
))
IP
™
operates every time the amplifier is turned on, or after a protect condition. During turn-on, the amplifier
goes into protect mode and leaves the speaker load disconnected until the amplifier determines that the
operating status is normal. The IP
™ circuit attenuates the signal during the initial turn-on or protect opera-
tion. After relay release, channel gain gradually increases to the attenuator setting to avoid unnecessary
stress on the loudspeakers.
T Th he errm ma all P Prro otte eccttiio on n
If the heatsink temperature or power transformer reaches an abnormally high temperature, the amplifier
will protect itself by disconnecting the speaker load until the amplifier returns to a normal temperature.
During this time, the Power LEDs will not illuminate for that particular channel, and the cooling fan(s) will
operate at maximum speed.
S Sh ho orrtt C Ciirrccu uiitt
If an output is shorted, the LFC
™
, speaker relay and thermal circuits will automatically protect the amplifier.
The LFC
™
circuit senses the short circuit as an abnormal load condition and reduces the channel gain to a
safe level for the load. In extreme or severe conditions, the speaker relays will disconnect the load and ini-
tiate a power-on start-up sequence.
D DC C V Vo olltta ag ge e P Prro otte eccttiio on n
If an amplifier channel detects DC voltage or subsonic signals at its output terminals, the speaker relay will
immediately open to prevent loudspeaker damage.
N Ne eu uttrriik k ® ® iiss a a rre eg giisstte erre ed d ttrra ad de em ma arrk k o off N Ne eu uttrriik k A AG G
S Sp pe ea ak ko on n ® ® iiss a a rre eg giisstte erre ed d ttrra ad de em ma arrk k o off N Ne eu uttrriik k A AG G