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Front Panel Information:
Power
Power
On
Off
Signal Limit Protect
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1: POWER SWITCH: This switch applies AC power to the
amplifier. The amp is on when the top of the switch is
depressed, off when the bottom of the switch is depressed.
The Power LED indicator (#3) illuminates when the ampli-
fier is on.
2: LEVEL CONTROL: This rotary potentiometer controls
the level or gain of the amplifier, with the fully-clockwise
position providing a sensitivity of +2dBv. Normal calibra-
tion of the SPA100 to a mixer would cause the Peak LED
to flash at the same time that the mixer’s VU meters indi-
cate full output.
3: POWER LED: This LED illuminates when AC power is
applied by means of the Power switch (#1). If the LED fails
to illuminate, check the AC outlet or the fuse on the rear
panel (#13).
4: SIGNAL LED: This LED illuminates when a signal is
detected at the amplifier’s output terminals. The level of
the signal must be at least 1% of the amplifier’s full rated
output to cause the LED illuminate.
5: LIMIT LED: The SPA100 employs an internal limit cir-
cuit to alert the user if the amplifier is approaching clip-
ping. The Limit LED illuminates whenever the input signal
attempts to overdrive the amplifier. (Not only does clip-
ping produce harsh sounding distortion, it is also capable
of damaging speaker components – particularly high fre-
quency drivers.) Periodic flashing of the Limit LED indi-
cates operation at or near full output. This is normal.
Steady illumination of the LED indicates constant opera-
tion of the Limiter, with the possibility that the input sig-
nal should be reduced by means of the Level control (#2).
6: PROTECT LED: This LED illuminates whenever the inter-
nal protection circuit is activated. The protection relay is
activated for a short period upon initial turn-on and at turn-
off to prevent transient “spikes” from being reproduced
through your speakers. A fault condition is also indicated in
the event of an overtemperature status, or if DC voltages
are present at the output. During thermal protection, the
output is shut down until the temperature returns to a safe
operating level. In the event of DC voltage on the output,
the output will be internally disconnected. The circuitry
associated with the LED indicator provides valuable pro-
tection for both the amplifier and your speakers.
7: FRONT PANEL EXHAUST VENT: The SPA100 employs a
variable-speed internal cooling fan to draw air through the
unit to keep it running cool even under extreme operating
conditions. Air is drawn in through the unit’s rear and side
intake vents and is forced out through the front panel
exhaust vent. Keep these vents clear and free from obstruc-
tion at all times to insure proper cooling.
SPA100 1/2-Rack Power Amplifier